Juniper JN0-348 : Enterprise Routing and Switching, Specialist (JNCIS-ENT)

  • Exam Code: JN0-348
  • Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
  • Updated: Sep 11, 2026
  • Q & A: 95 Questions and Answers

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About Juniper JN0-348 Exam Questions

Juniper JN0-348 Exam Topics:

SectionObjectives
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)
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)
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
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)
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
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)
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)
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
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

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

Juniper JN0-348 Exam Certification Details:

Exam Price$300 USD
Duration90 minutes
Exam CodeJN0-348 JNCIS-ENT
Exam NameEnterprise Routing and Switching Specialist
Passing ScoreVariable (60-70% Approx.)
Number of Questions65
Sample QuestionsJuniper JN0-348 Sample Questions
Recommended TrainingJunos Intermediate Routing (JIR)
Junos Enterprise Switching (JEX)
Exam RegistrationPEARSON VUE

The Juniper JN0-348 is the qualifying exam for the Juniper Networks Certified Internet Specialist - Enterprise Routing and Switching (JNCIS-ENT) certification. It validates IT specialists with intermediate-level knowledge required to implement routing and switching concepts in the Juniper Junos.

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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:

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

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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