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

  • Exam Code: JN0-348
  • Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
  • Updated: Sep 03, 2025
  • Q & A: 95 Questions and Answers

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Juniper JN0-348 Exam Topics:

SectionObjectives
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
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
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)
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 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
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)
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)

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

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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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