2026 JN0-664 dumps review - Professional Quiz Study Materials [Q21-Q45]

2026 JN0-664 dumps review - Professional Quiz Study Materials

JN0-664 Test Prep Training Practice Exam Questions Practice Tests

Passing the Juniper JN0-664 exam is a significant achievement for any networking professional. Service Provider, Professional (JNCIP-SP) certification demonstrates the candidate's ability to design, implement, and support service provider networks. Service Provider, Professional (JNCIP-SP) certification also provides recognition of the candidate's skills and expertise in the field of networking. The Juniper JN0-664 certification is highly respected in the industry and is recognized by many leading service providers around the world. With the JN0-664 certification, candidates can expand their career opportunities and increase their earning potential.

Juniper JN0-664 (Service Provider, Professional (JNCIP-SP)) certification exam is a challenging yet rewarding certification that is highly respected in the networking industry. It is an excellent way for networking professionals to demonstrate their expertise in service provider network design, implementation, and management and to open up new career opportunities. With the right preparation and study materials, candidates can pass the certification exam and take their careers to the next level.

 

NEW QUESTION # 21
Your network is receiving the 203.0.113.0/24 network using EBGP from AS 64500 and AS 64501. Both of these advertisements have identical local-preference values, AS-path lengths, and BGP origin codes. You want to influence the way your AS sends traffic to the 203.0.113.0/24 network.
In this scenario, which attribute would you consider next when selecting the best path?

• A. peer IP address
• B. IGP metric
• C. MED value
• D. router ID

Answer: C

Explanation:
To determine the correct answer, let's analyze the BGP path selection process and identify which attribute would be considered next in this scenario.
Background on BGP Path Selection
When multiple paths to the same destination are received via BGP, the router uses a step-by-step process to select the best path. The order of attributes considered is as follows (simplified for this scenario):
Highest Local Preference : The path with the highest local preference is preferred.
Shortest AS Path : The path with the shortest AS path length is preferred.
Lowest Origin Code : Paths with an origin code of IGP are preferred over EGP, and EGP is preferred over Incomplete.
Lowest MED (Multi-Exit Discriminator) : If the first three attributes are identical, the path with the lowest MED value is preferred.
eBGP over iBGP : eBGP paths are preferred over iBGP paths.
IGP Metric to Next Hop : The path with the lowest IGP metric to the next-hop router is preferred.
Router ID : If all else is equal, the path from the router with the lowest Router ID is preferred.
Peer IP Address : As a last tiebreaker, the path from the peer with the lowest IP address is preferred.
Scenario Analysis
In this scenario:
You are receiving the 203.0.113.0/24 network via EBGP from two different autonomous systems (AS 64500 and AS 64501).
Both advertisements have identical local-preference values , AS-path lengths , and BGP origin codes .
Given that the first three attributes in the BGP path selection process are identical, the next attribute to consider is the MED (Multi-Exit Discriminator) value.
Analysis of the Options
Option A: Router ID
Incorrect : The Router ID is considered much later in the BGP path selection process, only after other attributes like MED and IGP metric have been evaluated. Since MED is still relevant here, Router ID is not the next attribute to consider.
Option B: MED value
Correct : The MED value is used to influence inbound traffic from neighboring ASes. When local preference, AS path length, and origin code are identical, the path with the lowest MED value is preferred. This makes MED the next attribute to consider in this scenario.
Option C: Peer IP Address
Incorrect : The peer IP address is a tiebreaker used only at the very end of the BGP path selection process, after all other attributes have been evaluated. It is not relevant here because MED has not yet been considered.
Option D: IGP Metric
Incorrect : The IGP metric to the next-hop router is considered after MED. Since MED is still relevant in this scenario, IGP metric is not the next attribute to evaluate.
Final Answer
The correct answer is:
B . MED value
Summary
When local preference, AS path length, and origin code are identical, the MED value is the next attribute considered in the BGP path selection process.
MED is used to influence how traffic enters your AS from neighboring ASes.

NEW QUESTION # 22
You are configuring a Layer 3 VPN between two sites. You are configuring the vrf-target target : 65100:100 statement in your routing instance.
In this scenario, which two statements describe the vrf-target configuration? (Choose two.)

• A. This value is used to add a target community to BGP routes advertised to the remote PE device.
• B. This value is used to add a target community to BGP routes advertised to the local CE device.
• C. This value is used to identify BGP routes learned from the remote PE device.
• D. This value is used to identify BGP routes learned from the local CE device.

Answer: A,C

Explanation:
The `vrf-target` statement in a Layer 3 VPN configuration is used to control the import and export of VPN routes by attaching a target community to the routes. This helps in defining which VPN routes should be imported into or exported from a particular VRF (Virtual Routing and Forwarding) instance.
1. **Understanding VRF Target**:
- The `vrf-target` statement specifies the extended community attributes (route targets) that are used to control the import and export of routes in a VRF.
- These attributes help in identifying which routes should be shared between different VRFs, particularly across different PE (Provider Edge) devices.
2. **Statements Analysis**:
- **A. This value is used to identify BGP routes learned from the local CE device.**
- Incorrect. The `vrf-target` attribute is not used to identify routes learned from the local CE device. It is used to manage routes between PE devices and within the provider's MPLS network.
- **B. This value is used to identify BGP routes learned from the remote PE device.**
- Correct. The `vrf-target` value helps in identifying which routes from remote PE devices should be imported into the local VRF. It essentially acts as a filter for importing BGP routes with matching target communities.
- **C. This value is used to add a target community to BGP routes advertised to the local CE device.**
- Incorrect. Routes advertised to the local CE device do not use the `vrf-target` attribute. Instead, these routes are typically managed within the local VRF routing table.
- **D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
- Correct. When advertising routes from the local PE to remote PE devices, the `vrf-target` value is added to these routes. This target community ensures that the correct routes are shared across the VPN.
**Conclusion**:
The correct statements about the `vrf-target` configuration in a Layer 3 VPN scenario are:
**B. This value is used to identify BGP routes learned from the remote PE device.**
**D. This value is used to add a target community to BGP routes advertised to the remote PE device.**
**References**:
- Juniper Networks Documentation on VRF Target: [VRF Target
Configuration](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/layer-3-vpns.html)
- MPLS and VPN Architectures by Ivan Pepelnjak and Jim Guichard

NEW QUESTION # 23
Exhibit

You are attempting to summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500. You implement the export policy shown in the exhibit and all routes from the routing table stop being advertised.
In this scenario, which two steps would you take to summarize the route in BGP? (Choose two.)

• A. Remove the from protocol bgp command from the export policy.
• B. Add the set protocols bgp family inet unicast add-path command to allow additional routes to the RIB tables. -
• C. Replace exact in the export policy with orlonger.
• D. Add the set routing-options static route 203.0.113.123/25 discard command.

Answer: C,D

Explanation:
To summarize routes from the 203.0.113.128/25 IP block on R8 to AS 64500, you need to do the following:
Add the set routing-options static route 203.0.113.128/25 discard command. This creates a static route for the summary prefix and discards any traffic destined to it. This is necessary because BGP can only advertise routes that are present in the routing table.
Replace exact in the export policy with orlonger. This allows R8 to match and advertise any route that is equal or more specific than the summary prefix. The exact term only matches routes that are exactly equal to the summary prefix, which is not present in the routing table.

NEW QUESTION # 24
Exhibit

You are asked to exchange routes between R1 and R4 as shown in the exhibit. These two routers use the same AS number Which two steps will accomplish this task? (Choose two.)

• A. Configure the BGP group with the as-override parameter on R1 and R4
• B. Configure the BGP group with the advertise-peer-as parameter on R1 and R4.
• C. Configure the BGP group with the advertise-peer-as parameter on R2 and R3.
• D. Configure the BGP group with the as-override parameter on R2 and R3

Answer: C,D

NEW QUESTION # 25
You want to ensure that a single-area OSPF network will be loop free.
In this scenario, what are two requirements that satisfy this requirement? (Choose two.)

• A. All nodes within an area must have the same information in their LSDBs.
• B. The DR/BDR ensures that each node within an area has the same information in their LSDBs.
• C. Nodes within an area must connect in a full mesh.
• D. The Shortest Path First algorithm must prune looped paths.

Answer: A,D

Explanation:
DR/BDR doesn't ensure information sharing within the domain.

NEW QUESTION # 26
Which two statements are correct about a sham link? (Choose two.)

• A. The PEs exchange Type 1 OSPF LSAs instead of Type 3 OSPF LSAs for the L3VPN routes
• B. The PEs exchange Type 3 OSPF LSAs instead of Type 1 OSPF LSAs for the L3VPN routes.
• C. It creates a BGP multihop neighborship between two PE routers.
• D. It creates an OSPF multihop neighborship between two PE routers.

Answer: A,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/configuring-ospfv2-sham-links.html

NEW QUESTION # 27
Exhibit.

Referring to the exhibit, which path would traffic passing through R1 take to get to R4?

• A. R1 -> R2 -> R3 -> R4
• B. R1 -> R2 -> R4
• C. R1 -> R3 -> R4
• D. R1 -> R4

Answer: B

Explanation:
The OSPF cost is carried in the LSAs that are exchanged within an OSPF area. When a router calculates the cost to a destination it uses the cost of the exit interface of each router in the path to the destination.

NEW QUESTION # 28
Exhibit

R4 is directly connected to both RPs (R2 and R3) R4 is currently sending all ,o,ns upstream to R3 but you want all joins to go to R2 instead Referring to the exhibit, which configuration change will solve this issue?

• A. Change the bootstrap priority on R2 to be higher than R3
• B. Change the default route in inet.2 on R4 from R3 as the next hop to R2
• C. Change the group-range to be more specific on R2 than R3.
• D. Change the local address on R2 to be higher than R3.

Answer: C

NEW QUESTION # 29
Exhibit

A network designer would like to create a summary route as shown in the exhibit, but the configuration is not working.
Which three configuration changes will create a summary route? (Choose three.)

• A. delete policy-options policy-statement leak-v6 term DC-routes from route-filter 2001: db9 :a: fa00 : :/6l longer
• B. delete protocols isis export summary-v6
• C. set protocols isis import summary-v6
• D. set policy-options policy-statement leak-v6 term DC-routes then reject
• E. set policy-options policy-statement leak-v6 term DC-routes from route-filter 2001:db9:a:faOO::/61 exact

Answer: A,B,E

Explanation:
Explanation
To create a summary route for IS-IS, you need to configure a policy statement that matches the prefixes to be summarized and sets the next-hop to discard. You also need to configure a summary-address statement under the IS-IS protocol hierarchy that references the policy statement. In this case, the policy statement leak-v6 is trying to match the prefix 2001:db9:a:fa00::/61 exactly, but this prefix is not advertised by any router in the network. Therefore, no summary route is created. To fix this, you need to delete the longer keyword from the route-filter term and change the prefix length to /61 exact. This will match any prefix that falls within the /61 range. You also need to delete the export statement under protocols isis, because this will export all routes that match the policy statement to other IS-IS routers, which is not desired for a summary route.

NEW QUESTION # 30

Click the Exhibit hutton.
You are configuring an interprovider Option C Layer 3 VPN to connect two customer sites.
Referring to the exhibit, which three statements are correct? (Choose three.)

• A. P routers only maintain the internal routes from their own AS.
• B. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
• C. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
• D. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.
• E. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.

Answer: A,D,E

Explanation:
Interprovider Option C for Layer 3 VPNs involves the use of Autonomous System Boundary Routers (ASBRs) to exchange labeled VPN-IPv4 routes between different Autonomous Systems (AS). This option requires BGP sessions between ASBRs, and the VPN routes are carried end-to-end using MPLS labels. Here' s a detailed analysis of the roles of different routers in this scenario:
1. **ASBR Routers**:
- ASBRs are responsible for exchanging VPN-IPv4 routes between different ASes.
- **A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
- Correct. ASBRs maintain routes to internal destinations within their own AS, and they also need to know the loopback addresses of PEs in the other AS to set up the BGP sessions and MPLS tunnels.
2. **PE Routers**:
- PE routers are responsible for maintaining VPN routes and label information to forward VPN traffic correctly.
- **B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Correct. PE routers need to maintain:
- Internal routes within their AS for routing.
- Loopback addresses of other AS PEs for establishing MPLS LSPs.
- L3VPN routes to provide end-to-end VPN connectivity.
3. **P Routers**:
- P routers are the core routers that do not participate in BGP VPN routing but forward labeled packets based on MPLS labels.
- **C. P routers only maintain the internal routes from their own AS.**
- Correct. P routers maintain the internal routing information to forward packets within the AS and use MPLS labels for forwarding VPN packets. They do not maintain VPN routes or routes from other ASes.
4. **Incorrect Statements**:
- **D. P routers maintain the internal routes from its own AS and the loopback address from the other AS PEs.
**
- Incorrect. P routers do not need to maintain the loopback addresses of other AS PEs. They only maintain internal routing and MPLS label information.
- **E. ASBR routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
- Incorrect. ASBR routers do not maintain L3VPN routes. They exchange labeled VPN-IPv4 routes with other ASBRs and forward them to PE routers.
**Conclusion**:
The correct answers are:
**A. ASBR routers maintain the internal routes from its own AS and the loopback addresses from the other AS PEs.**
**B. PE routers maintain the internal routes from its own AS, the loopback address from the other AS PEs, and the L3VPN routes.**
**C. P routers only maintain the internal routes from their own AS.**
**References**:
- Juniper Networks Documentation on Interprovider VPNs: [Interprovider VPN Configuration](https://www.
juniper.net/documentation/en_US/junos/topics/topic-map/mpls-vpn-interprovider.html)
- MPLS and VPN Architectures, CCIP Edition by Ivan Pepelnjak and Jim Guichard

NEW QUESTION # 31

Click the Exhibit button.
Which two statements are correct about the class-of-service configuration shown in the exhibit? (Choose two.)

• A. The best-effort queue can transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, if no other queue is using that bandwidth.
• B. The best-effort queue can never transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, even if that bandwidth is available.
• C. Incoming traffic will not be classified because no classifier exists in the configuration.
• D. Incoming traffic will be classified using the default classifier.

Answer: A,C

Explanation:
The class-of-service (CoS) configuration in the exhibit shows how traffic is scheduled on the ge-0/0/0 interface. Let's analyze each statement to determine its correctness:
A: Incoming traffic will not be classified because no classifier exists in the configuration.
* This statement is correct. The configuration shown does not include any classifier, so no explicit classification is defined. As a result, incoming traffic will not be classified according to any custom criteria.
B: The best-effort queue can transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, if no other queue is using that bandwidth.
* This statement is correct. The transmit-rate percent 40 means that 40% of the bandwidth is guaranteed for the best-effort queue, but it can use more bandwidth if other queues (like the priority scheduler) are not utilizing their allocated bandwidth.
C: Incoming traffic will be classified using the default classifier.
* This statement is incorrect. Without an explicit classifier in the configuration, there is no mention of a default classifier being used. Therefore, the incoming traffic won't be classified based on the configuration shown.
D: The best-effort queue can never transmit more than 40% of the total bandwidth on the ge-0/0/0 interface, even if that bandwidth is available.
* This statement is incorrect. The transmit-rate percent 40 sets a guaranteed minimum bandwidth but does not set a maximum limit. The best-effort queue can utilize more bandwidth if other queues are not using their allocated portions.

NEW QUESTION # 32
Exhibit

You are running a service provider network and must transport a customer's IPv6 traffic across your IPv4-based MPLS network using BGP You have already configured mpis ipv6-tunneling on your PE routers.
Which two statements are correct about the BGP configuration in this scenario? (Choose two.)

• A. You must configure family inet6 labcled-unicast between PE routers.
• B. You must configure family inet6 add-path between PE and CE routers.
• C. You must configure family inet6 unicaat between PE and CE routers.
• D. You must configure family inet6 unicast between PE routers

Answer: A,C

Explanation:
To transport IPv6 traffic over an IPv4-based MPLS network using BGP, you need to configure two address families: family inet6 labeled-unicast and family inet6 unicast. The former is used to exchange IPv6 routes with MPLS labels between PE routers, and the latter is used to exchange IPv6 routes without labels between PE and CE routers. The mpis ipv6-tunneling command enables the PE routers to encapsulate the IPv6 packets with an MPLS label stack and an IPv4 header before sending them over the MPLS network.

NEW QUESTION # 33

Click the Exhibit button.
Referring to the exhibit, which two statements are correct about BGP routes on R3 that are advertised to R1?
(Choose two.)

• A. By default, the next-hop value for these routes is changed by R3 before being sent to R1.
• B. By default, the BGP local-preference value that is assigned on R3 is advertised to R1.
• C. By default, all BGP attributes values must be removed before advertising the routes to R1.
• D. By default, the next-hop value for these routes is not changed by R3 before being sent to R1.

Answer: B,D

Explanation:
In the exhibit, we see an internal BGP (iBGP) setup within AS 65512, and an external BGP (eBGP) connection between R3 and ISP-A (AS 65511). The questions focus on the behavior of BGP routes advertised from R3 to R1 within the same AS.
1. **BGP Next-Hop Attribute (Option A and D)**:
- In iBGP, the next-hop attribute is **not** changed when a route is advertised to another iBGP peer. This means that when R3 advertises a route to R1, it retains the original next-hop value as learned from the eBGP peer (ISP-A).
- Therefore, Option D is correct: "By default, the next-hop value for these routes is not changed by R3 before being sent to R1."
2. **BGP Attributes (Option B and C)**:
- BGP attributes such as local preference, AS-path, and others are crucial for BGP route selection. The local preference attribute is used within an AS to indicate the preferred path for outbound traffic.
- When R3 advertises BGP routes to R1, it includes the local preference value assigned to those routes. This value is not removed and is propagated within the iBGP mesh.
- Therefore, Option C is correct: "By default, the BGP local-preference value that is assigned on R3 is advertised to R1."
**References**:
- Juniper Networks documentation on BGP behavior provides detailed insights into the propagation of BGP attributes within iBGP and eBGP contexts. Specifically, the Junos OS documentation covers the default behavior of next-hop and local preference attributes in BGP configurations.
- Junos OS BGP Configuration Guide: [Junos OS BGP Configuration
Guide](https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-overview.html)
- For a deeper understanding of BGP attributes and their default behaviors, the "Juniper Networks Day One:
Exploring BGP" book is an excellent resource.

NEW QUESTION # 34
Which two statements are correct about VPLS tunnels? (Choose two.)

• A. LDP-signaled VPLS tunnels use auto-discovery to provision sites.
• B. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
• C. BGP-signaled VPLS tunnels require manual provisioning of sites.
• D. LDP-signaled VPLS tunnels only support control bit 0.

Answer: B,D

NEW QUESTION # 35


Click the Exhibit button.
Referring to the exhibit, which two statements are correct regarding the output shown in the exhibit? (Choose two.)

• A. The multicast group is an ASM group.
• B. The multicast group is an SSM group.
• C. The multicast traffic is using the SPT.
• D. The multicast traffic is using the RPT.

Answer: A,C

Explanation:
In the provided exhibit, the output of the `show pim join extensive 232.1.1.1` command is shown. This command provides detailed information about the PIM join state for the specified multicast group (232.1.1.1) on the router R1. To determine the correct statements regarding the multicast traffic, let's analyze the output and the terms involved:
1. **ASM vs. SSM**:
- **ASM (Any-Source Multicast)**: In ASM, receivers are interested in receiving multicast traffic from any source sending to a particular multicast group.
- **SSM (Source-Specific Multicast)**: In SSM, receivers are interested in receiving traffic only from specific sources for a multicast group.
- **Group Address Range**:
- ASM uses the range 224.0.0.0 to 239.255.255.255.
- SSM uses the range 232.0.0.0 to 232.255.255.255.
Since the group address 232.1.1.1 falls within the SSM range (232.0.0.0/8), there might be confusion.
However, considering the flags and states in the output, it's evident that the PIM mode and source information are consistent with ASM behavior.
2. **Multicast Trees**:
- **RPT (Rendezvous Point Tree)**: Multicast traffic initially uses the RPT, where the Rendezvous Point (RP) acts as an intermediate point.
- **SPT (Shortest Path Tree)**: After the initial join via RPT, traffic can switch to SPT, which is a direct path from the source to the receiver.
3. **Output Analysis**:
- **Flags**:
- The flags `sparse, rp-tree, wildcard` indicate that the group 232.1.1.1 is currently using RPT. This is typical for ASM, where traffic initially goes through the RP.
- The flags `sparse, spt` indicate that for the source 172.16.1.2, traffic has switched to SPT, meaning it is using the shortest path from the source directly to the receivers.
**Conclusion**:
Based on the analysis:
- **A. The multicast group is an ASM group**: This statement is correct as the configuration and behavior indicate ASM operation.
- **B. The multicast traffic is using the SPT**: This statement is also correct because the flags for the source
172.16.1.2 indicate that the traffic is using the SPT.
Thus, the correct answers are:
**A. The multicast group is an ASM group.**
**B. The multicast traffic is using the SPT.**
**References**:
- Juniper Networks PIM Documentation: [PIM
Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/pim-overview.html)
- Junos OS Multicast Routing Configuration Guide: [Multicast Routing Configuration Guide](https://www.juniper.net/documentation/en_US/junos/topics/topic-map/multicast-routing.html)

NEW QUESTION # 36
Exhibit

Which two statements about the output shown in the exhibit are correct? (Choose two.)

• A. There has been a VLAN ID mismatch.
• B. The PE is attached to a single local site.
• C. The connection has not flapped since it was initiated.
• D. The PE router has the capability to pop flow labels

Answer: B,C

Explanation:
The output is from the show l2vpn connections command on a Juniper router. This command is used to verify the status of Layer 2 VPN (L2VPN) pseudowires between Provider Edge (PE) routers.
Breakdown of Key Information:
* Instance: vpn-A
* This is the L2VPN instance being monitored.
* Connection Status (St)
* The connection status is "Up", meaning the pseudowire is operational.
* Local Site: CE1-2 (2)
* The PE router is attached to a single local site (CE1-2).
* Uptime & Connection Flaps
* The output shows the last time the connection was up:
Time last up: Apr 11 14:35:27 2020
* The "# Up trans" value is 1, meaning this connection has been established once and has not flapped since it was initiated.
* VLAN ID Mismatch Check
* The legend includes "VM - VLAN ID mismatch", but this status is not present in the connection output.
* This means there is NO VLAN ID mismatch.
* Flow Labels
* The Flow Label Transmit is No, and the Flow Label Receive is No.
* This means the PE router does NOT have the capability to pop flow labels.

NEW QUESTION # 37
Which three statements about IS-IS in a multi-area network are correct? (Choose three.)

• A. External L2 PDUs are flooded to all L2 routers in other areas.
• B. Internal L1 PDUs are only flooded to the local area's L1 routers.
• C. Internal L1 PDUs are flooded to all L1 routers in other areas.
• D. External L2 PDUs are only flooded to the local area's L2 routers.
• E. Internal L1 PDUs are flooded to the local area's L2 routers.

Answer: A,B,E

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol designed to move information efficiently within a computer network, a group of physically connected computers or similar devices. It operates in two levels, Level 1 (L1) and Level 2 (L2), and supports hierarchical routing within a multi-area network.
Let's analyze each statement to determine its correctness in the context of IS-IS multi-area networks.
1. **Statement A: Internal L1 PDUs are flooded to the local area's L2 routers.**
- This statement is correct. L1 PDUs (Protocol Data Units) are flooded within the L1 area and also to the L2 routers that are present in the same area. These L2 routers act as the boundary routers that connect the local L1 area to other L1 areas via L2.
2. **Statement B: External L2 PDUs are flooded to all L2 routers in other areas.**
- This statement is correct. L2 PDUs are flooded throughout the entire L2 backbone, which includes all L2 routers in different areas. This ensures that inter-area routing information is shared across the network.
3. **Statement C: Internal L1 PDUs are flooded to all L1 routers in other areas.**
- This statement is incorrect. Internal L1 PDUs are only flooded within the local L1 area. They do not cross L1 area boundaries; inter-area communication is handled by L2 routers.
4. **Statement D: Internal L1 PDUs are only flooded to the local area's L1 routers.**
- This statement is correct. Internal L1 PDUs are indeed only flooded within their local L1 area, and do not go beyond it.
5. **Statement E: External L2 PDUs are only flooded to the local area's L2 routers.**
- This statement is incorrect. External L2 PDUs are flooded to all L2 routers throughout the IS-IS network, not just to those in the local area. This allows L2 routers to maintain a complete map of the network's topology.
**Conclusion**:
Given the analysis, the correct answers are:
**A. Internal L1 PDUs are flooded to the local area's L2 routers.**
**B. External L2 PDUs are flooded to all L2 routers in other areas.**
**D. Internal L1 PDUs are only flooded to the local area's L1 routers.**
**Reference**:
- Juniper Networks Documentation on IS-IS: [IS-IS Overview](https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html)
- RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments: [RFC 1195](https://tools.ietf.org/html/rfc1195) which details the operation of IS-IS in multi-area networks.

NEW QUESTION # 38
Exhibit

Based on the configuration contents shown in the exhibit, which statement is true?

• A. Joins for any group are accepted if the group count value is less than 25.
• B. Joins for group 224.7.7.7 are rejected if the source address is 192.168.100.10
• C. Joins for group 224.7.7.7 are accepted if the group count is less than 25
• D. Joins for group 224.7.7.7 are always rejected, regardless of the group count.

Answer: C

Explanation:
BGP policy framework is a set of tools that allows you to control the flow of routing information and apply routing policies based on various criteria. BGP policy framework consists of several components, such as route maps, prefix lists, community lists, AS path lists, and route filters. Route maps are used to define routing policies by matching certain conditions and applying certain actions. Prefix lists are used to filter routes based on their prefixes. Community lists are used to filter routes based on their community attributes. AS path lists are used to filter routes based on their AS path attributes. Route filters are used to filter routes based on their prefix length or range3. In this question, we have a route map named ISP-A that has two clauses: clause 10 and clause 20. Clause 10 matches any route with a prefix length between 8 and 24 bits and sets the local preference to 200. Clause 20 matches any route with a prefix of 224.7.7.7/32 and rejects it. The route map is applied inbound on the BGP neighborship with ISP-A. Based on this configuration, the correct statement is that joins for group 224.7.7.7 are always rejected, regardless of the group count. This is because clause 20 explicitly denies any route with a prefix of 224.7.7.7/32, which corresponds to the multicast group 224.7.7.7.

NEW QUESTION # 39
Which two statements are correct about IS-IS interfaces? (Choose two.)

• A. If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
• B. If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level.
• C. If a point-to-point interface is in both 11 and L2, one combined hello message is sent for both levels.
• D. If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.

Answer: B,C

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol that supports Level 1 (L1), Level 2 (L2), or both (L1/L2) operations. The way IS-IS sends Hello (IIH) packets depends on whether the interface is point-to-point (P2P) or broadcast (LAN).
Evaluating the Answer Choices
✅ Option A: "If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level." Incorrect!
On point-to-point (P2P) interfaces, only one combined Hello message is sent for both L1 and L2.
IS-IS P2P Hellos include both Level 1 and Level 2 TLVs in the same message.
Reference:
❌ This statement is incorrect.
✅ Option B: "If a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels." Correct!
On point-to-point (P2P) links, IS-IS sends a single Hello message that includes TLVs for both L1 and L2.
This reduces overhead and simplifies adjacency formation.
✅ This statement is correct.
✅ Option C: "If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level." Correct!
On broadcast (LAN) interfaces, IS-IS sends separate Hello messages for L1 and L2.
This is because L1 and L2 use separate Designated IS (DIS) elections and different multicast addresses:
L1 Hellos: Sent to AllL1IS (01:80:C2:00:00:14)
L2 Hellos: Sent to AllL2IS (01:80:C2:00:00:15)
✅ This statement is correct.
✅ Option D: "If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels." Incorrect!
As stated above, IS-IS sends separate Hello messages for L1 and L2 on broadcast interfaces because they have independent DIS elections.
❌ This statement is incorrect.
Final answer:
✅ B. If a point-to-point interface is in both L1 and L2, one combined hello message is sent for both levels.
✅ C. If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level.
Verification from Juniper Documentation
Juniper IS-IS Configuration Guide confirms:
Point-to-Point (P2P) interfaces send one combined Hello for both levels.
Broadcast interfaces send separate L1 and L2 Hellos due to separate DIS elections.
RFC 1195 (IS-IS Extensions for IPv4) specifies that broadcast networks require distinct Hellos per level.

NEW QUESTION # 40
Referring to the exhibit, which statement is correct?

• A. The route-distinguisher configuration will allow overlapping routes to be shared between CE-1 and CE-2.
• B. The vrf-target configuration will stop routes from being shared between CE-1 and CE-2.
• C. The route-distinguisher configuration will stop routes from being shared between CE-1 and CE-2.
• D. The vrf-target configuration will allow routes to be shared between CE-1 and CE-2.

Answer: D

NEW QUESTION # 41
Exhibit.

Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?

• A. Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter
• B. Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.
• C. Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.
• D. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.

Answer: B

Explanation:
Explanation
IS-IS routers can form Level 1 or Level 2 adjacencies depending on their configuration and network topology.
Level 1 routers are intra-area routers that share the same area address with their neighbors. Level 2 routers are inter-area routers that can connect different areas. Level 1-2 routers are both intra-area and inter-area routers that can form adjacencies with any other router.
In the exhibit, R1 and R2 are in different areas (49.0001 and 49.0002), so they cannot form a Level 1 adjacency. However, they can form a Level 2 adjacency if they are both configured as Level 1-2 routers. R1 is already configured as a Level 1-2 router, but R2 is configured as a Level 1 router only, because of the level 1 disable command under the lo0.0 interface. This command disables Level 2 routing on the loopback interface, which is used as the router ID for IS-IS.
Therefore, to establish a Level 1 adjacency between R1 and R2, the level 1 disable command under the R2 protocols isis interface lo0.0 hierarchy must be removed. This will enable Level 2 routing on R2 and allow it to form a Level 2 adjacency with R1.

NEW QUESTION # 42
Exhibit.

Referring to the exhib.t, what must be changed to establish a Level 1 adjacency between routers R1 and R2?

• A. Change the level 1 disable parameter under the R2 protocols isis interface ge-1/2/3 .0 hierarchy to the level 2 disable parameter
• B. Remove the level i disable parameter under the R2 protocols isis interface loo . 0 configuration hierarchy.
• C. Add IP addresses to the interface ge-l/2/3 unit 0 family iso hierarchy on both R1 and R2.
• D. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.

Answer: B

Explanation:
IS-IS routers can form Level 1 or Level 2 adjacencies depending on their configuration and network topology.
Level 1 routers are intra-area routers that share the same area address with their neighbors. Level 2 routers are inter-area routers that can connect different areas. Level 1-2 routers are both intra-area and inter-area routers that can form adjacencies with any other router.
In the exhibit, R1 and R2 are in different areas (49.0001 and 49.0002), so they cannot form a Level 1 adjacency. However, they can form a Level 2 adjacency if they are both configured as Level 1-2 routers. R1 is already configured as a Level 1-2 router, but R2 is configured as a Level 1 router only, because of the level 1 disable command under the lo0.0 interface. This command disables Level 2 routing on the loopback interface, which is used as the router ID for IS-IS.
Therefore, to establish a Level 1 adjacency between R1 and R2, the level 1 disable command under the R2 protocols isis interface lo0.0 hierarchy must be removed. This will enable Level 2 routing on R2 and allow it to form a Level 2 adjacency with R1.

NEW QUESTION # 43
Exhibit

Referring to the exhibit, you are receiving the 192.168 0 0/16 route on both R3 and R4 from your EBGP neighbor You must ensure that R1 and R2 receive both BGP routes from the route reflector In this scenario, which BGP feature should you configure to accomplish this behavior?

• A. route-target
• B. multihop
• C. add-path
• D. multipath

Answer: C

Explanation:
Explanation
BGP add-path is a feature that allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths. This behavior promotes path diversity and reduces multi-exit discriminator (MED) oscillations. BGP add-path is implemented by adding a path identifier to each path in the NLRI. The path identifier can be considered as something similar to a route distinguisher in VPNs, except that a path ID can apply to any address family. Path IDs are unique to a peering session and are generated for each network3. In this question, we have a route reflector (RR) that receives two routes for the same prefix (192.168.0.0/16) from an EBGP neighbor. By default, the RR will only advertise its best path to its clients (R1 and R2). However, we want R1 and R2 to receive both routes from the RR. To achieve this, we need to configure BGP add-path on the RR and enable it to send multiple paths for the same prefix to its clients.

NEW QUESTION # 44
When building an interprovider VPN, you notice on the PE router that you have hidden routes which are received from your BGP peer with family inet labeled-unica3t configured.
Which parameter must you configure to solve this problem?

• A. Under the protocols ospf hierarchy, add the traffic-engineering parameter.
• B. Under the family inet labeled-unicast hierarchy, add the resolve-vpn parameter.
• C. Under the protocols mpls hierarchy, add the traffic-engineering parameter
• D. Under the family inet labeled-unicast hierarchy, add the explicit null parameter.

Answer: B

Explanation:
The resolve-vpn parameter is a BGP option that allows a router to resolve labeled VPN-IPv4 routes using unlabeled IPv4 routes received from another BGP peer with family inet labeled-unicast configured. This option enables interprovider VPNs without requiring MPLS labels between ASBRs or using VRF tables on ASBRs. In this scenario, you need to configure the resolve-vpn parameter under [edit protocols bgp group external family inet labeled-unicast] hierarchy level on both ASBRs.

NEW QUESTION # 45
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