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

  • Exam Code: JN0-348
  • Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
  • Updated: Jun 03, 2026
  • Q & A: 95 Questions and Answers

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About Juniper JN0-348 Exam

Juniper JN0-348 Exam Topics:

SectionObjectives
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
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)
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)
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
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)
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

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What Is Juniper Networks Certified Internet Specialist - Enterprise Routing and Switching?

This certification is targeted towards seasoned networking specialists with advanced knowledge of routing and switching implementations within Junos. In general, such a certificate measures the basic knowledge of routing and switching concepts and how they relate to platform configuration and other relevant skills. The prerequisite training for attaining this designation is the mid-level Juniper Networks Certified Internet Associate - Junos certification. Of course, we can’t fail to mention the fact this Juniper certificate is part of the broader Juniper Enterprise Routing and Switching Certification Path which also includes the aforementioned JNCIA-Junos certification.

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

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