2. Junos Enterprise Switching (JEX)

The Junos Enterprise Switching (JEX) is the second course associated with the Junos JN0-348 exam. Like the first class, it is also a two-day training program but with an emphasis on switching knowledge and the relevant configuration skills. It includes in-depth coverage of switching concepts, the Spanning Tree Protocol (STP), virtual LANs, and the features of high availability as well as device security. The training is exclusively centered on the Junos OS Release 20.1R1.11 and features interactive demonstrations alongside hands-on labs to ensure candidates are aptly prepared to face their exams. If you have already acquired the basic routing skills and are now looking to prove your ability to manage or troubleshoot networks, this training is the way forward. All in all, this course targets IT specialists of two groups:

Candidates who have already attempted and passed the Introduction to Junos Operating System (IJOS) lessons.
Individuals with fundamental knowledge of the OSI model and TCP/IP protocol suite;

Also, you should be proficient in knowing with the relevant Juniper products before registering for this training: Junos OS, EX Series, and Switching. As for the course content, on the 1st day of your training, you can expect the instructors to start by introducing the course before addressing Switching Concepts, Virtual Networks, and the Spanning Tree. The real task, however, lies on the second day, where the trainers will now cover the topics of Port Security, Device Security and Firewall Filters, Virtual Chassis, and High Availability. Here, self-motivated candidates who have already mastered the objectives of MAC Limiting, MACsec, Storm Control, Firewall Filters, and Nonstop Bridging (NSB) among other skills will find it easier to grasp the tested concepts.

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Juniper JN0-348 Exam Topics:

Section	Objectives
IS-IS	Describe the concepts, operation or functionality of IS-IS Link-state database IS-IS PDUs TLVs Adjacencies and neighbors Levels and areas Designated intermediate system (DIS) Metrics Demonstrate knowledge of how to configure, monitor or troubleshoot IS-IS Levels, interfaces and adjacencies Additional basic options Routing policy application Troubleshooting tools (e.g., ping, traceroute, trace options, show commands, logging)
BGP	Describe the concepts, operation or functionality of BGP BGP basic operation BGP message types Attributes Route/path selection process IBGP and EBGP functionality and interaction Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP Groups and peers Additional basic options Routing policy application Troubleshooting tools (e.g., ping, traceroute, trace options, show commands, logging)
OSPF	Describe the concepts, operation or functionality of OSPF Link-state database OSPF packet types Router ID Adjacencies and neighbors Designated router (DR) and backup designated router (BDR) OSPF area and router types Realms LSA packet types Demonstrate knowledge how to configure, monitor or troubleshoot OSPF Areas, interfaces and neighbors Additional basic options Routing policy application Troubleshooting tools (e.g., ping, traceroute, trace options, show commands, logging)
Layer 2 Security	Identify the concepts, benefits or operation of various Layer 2 protection or security features BPDU, loop or root protection Port security, including MAC limiting, DHCP snooping, Dynamic ARP inspection (DAI) or IP source guard MACsec Storm control Identify the concepts, benefits or operation of Layer 2 firewall filters Filter types Processing order Match criteria and actions Demonstrate knowledge how to configure, monitor, or troubleshoot Layer 2 security Protection Port security Storm control Firewall filter configuration and application
Protocol Independent Routing	Identify the concepts, operation or functionality of various protocol-independent routing components Static, aggregate, and generated routes Martian addresses Routing instances, including RIB groups Load balancing Filter-based forwarding Demonstrate knowledge how to configure, monitor, or troubleshoot various protocol-independent routing components Static, aggregate, and generated routes Load balancing Filter-based forwarding
Tunnels	Identify the concepts, requirements or functionality of IP tunneling Tunneling applications and considerations GRE/UDP IP-IP Demonstrate knowledge of how to configure, monitor or troubleshoot IP tunnels GRE/UDP IP-IP Troubleshooting tools (e.g., ping, traceroute, trace options, show commands, logging)
Spanning Tree	Describe the concepts, benefits, operation, or functionality of the Spanning Tree Protocol STP and RSTP concepts Port roles and states BPDUs Convergence and reconvergence Demonstrate knowledge how to configure, monitor, or troubleshoot STP and RSTP STP RSTP
High Availability	Identify the concepts, benefits, applications or requirements for high availability in a Junos OS environment Link aggregation groups (LAG) Redundant trunk groups (RTG) Virtual Chassis Graceful restart (GR) Graceful Routing Engine switchover (GRES) Nonstop active routing (NSR) Nonstop bridging (NSB) Bidirectional Forwarding Detection (BFD) Virtual Router Redundancy Protocol (VRRP) Unified In-Service Software Upgrade (ISSU) Demonstrate knowledge of how to configure, monitor, or troubleshoot high availability components LAG and RTG Virtual Chassis GR, GRES, NSB, and NSR VRRP ISSU Troubleshooting tools (e.g., trace options, show commands, logging)
Layer 2 Switching or VLANs	Identify the concepts, operation, or functionality of Layer 2 switching for the Junos OS Bridging components Frame processing Describe the concepts, benefits, or functionality of VLANs Ports Tagging Native VLANs and voice VLANs Inter-VLAN routing Demonstrate knowledge how to configure, monitor or troubleshoot Layer 2 switching or VLANs Interfaces and ports VLANs Junos Network Director Inter-VLAN Routing

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In order to provide the latest and the most accurate JN0-348 study materials to customers, we will update our JN0-348 exam questions: Enterprise Routing and Switching, Specialist (JNCIS-ENT) regularly which covers all the keys points and the newest question types in the IT examination. After buying our JN0-348 training materials, you can enjoy one-year free update, our operation system will automatically send these latest and most accurate JN0-348 actual lab questions to your e-mail which you used to buy our products. And you just need to check your mailbox. If you are familiar with these key points and the new question types of the IT exam in our JN0-348 exam questions: Enterprise Routing and Switching, Specialist (JNCIS-ENT) and practice the questions in our materials there is no doubt that you can pass the IT exam and gain the Juniper certification easily.

Helpful Revision Book

Here’s what to know about the efficient study guide for JN0-348:

Juniper Enterprise Routing: Practical Guide to Junos Routing and Certification
The Juniper Enterprise Routing study guide is available for only $61 on Amazon and is a handy resource when it comes to Juniper JN0-348 exam prep. It is written by three experienced IT professionals, Peter Southwick, Doug Marschke, and Harry Reynolds, who view it as the go-to study guide for excellent grades. It features important exam guidelines and covers Security Concepts, Layer 2 services, and IGP & BGP routing protocols in the simplest way possible. While the key emphasis will be on practical solutions, this book also provides insightful coverage of the exam concepts to ensure candidates have one of the most authoritative resources for JN0-348 certification exam prep.

Reference: https://www.juniper.net/us/en/training/certification/certification-tracks/ent-routing-switching-track/?tab=jncis-enterprise

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