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Juniper JNCIS-ENT JN0-348

JN0-348

Exam Code: JN0-348

Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)

Updated: Jul 17, 2026

Q & A: 95 Questions and Answers

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What to Know about Exam

The Juniper JN0-348, like many Juniper tests, lasts 90 minutes with a maximum of 65 multiple-choice items. It is an exam that’s offered through the Pearson VUE website and candidates are usually graded based on pass/fail status. Juniper recommends that the willing exam-takers must be well-conversant with the Junos Space Network Director 3.1 and Junos 18.4 before registering for this test.

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Juniper JN0-348 Exam Topics:

SectionObjectives
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
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
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
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)
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)
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)
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)
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

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

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.

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Juniper Enterprise Routing and Switching Certification Path: Excellent Track, but What Does It Entail?

The Juniper Enterprise Routing and Switching certification path allows trainees to showcase their proficiency in working with Juniper Networks technology. This track focuses on routing and switching as part of the overall Juniper Networks enterprise solutions. So, if you are keen to merge the two skills and also demonstrate your troubleshooting flair, this is the way to go.

Juniper JN0-348 Exam Syllabus Topics:

SectionWeightObjectives
IP Tunneling and High Availability10%- GRE and IP-IP tunnels
- Nonstop Active Routing (NSR)
- Unified ISSU
- Graceful Routing Engine Switchover (GRES)
Layer 2 Switching and VLANs20%- Ethernet switching concepts
- VLAN configuration and operation
- Trunking and native VLAN
- Inter-VLAN routing
IS-IS10%- Level 1 and Level 2 routing
- Basic configuration and verification
- IS-IS routing hierarchy
Layer 2 Security10%- Port security and MAC limiting
- Storm control
- DHCP snooping and ARP inspection
- BPDU protection and root protection
Spanning Tree Protocols15%- Port roles, states, and BPDU handling
- STP, RSTP, MSTP concepts
- Loop protection and configuration
BGP10%- Policy implementation and troubleshooting
- IBGP and EBGP peering
- BGP attributes and path selection
Protocol-Independent Routing10%- Static and aggregate routes
- Load balancing and filter-based forwarding
- Routing policy and filters
OSPF15%- Areas, neighbors, and adjacencies
- Configuration, monitoring, and troubleshooting
- OSPFv2 and OSPFv3 concepts

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