Enterprise Routing and Switching, Specialist (JNCIS-ENT)

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This track enables you to demonstrate competence with networking technology in general and Juniper Networks enterprise routing and switching platforms. JNCIS-ENT, the specialist-level certification in this track, is designed for experienced networking professionals with beginner to intermediate knowledge of routing and switching implementations in Junos. The written exam verifies your basic understanding of routing and switching technologies and related platform configuration and troubleshooting skills.

This track includes four certifications:

  • JNCIA-Junos: Junos, Associate. For details, see JNCIA-Junos.
  • JNCIS-ENT: Enterprise Routing and Switching, Specialist. For details, see the sections below.
  • JNCIP-ENT: Enterprise Routing and Switching, Professional. For details, see JNCIP-ENT.
  • JNCIE-ENT: Enterprise Routing and Switching, Expert. For details, see JNCIE-ENT.

Exam Preparation

We recommend the following resources to help you prepare for your exam. However, these resources aren't required, and using them doesn't guarantee you'll pass the exam.

Exam Resources

Additional Preparation

Exam Objectives

Here’s a high-level view of the skillset required to successfully complete the JNCIS-ENT certification exam.

Exam Objective

Description

Layer 2 Switching or VLANs

Identify the concepts, operations, or functionalities of Layer 2 switching for the Junos OS:

  • Bridging components
  • Frame processing

 

Describe the concepts, benefits, or functionalities 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
  • Inter-VLAN routing  

Spanning Tree

Describe the concepts, benefits, operations, or functionalities of the Spanning Tree Protocol (STP):

  • STP and Rapid Spanning Tree Protocol (RSTP) concepts
  • Port roles and states
  • Bridge Protocol Data Units (BPDUs)
  • Convergence and reconvergence

 

Demonstrate knowledge how to configure, monitor, or troubleshoot Spanning Tree:

  • STP
  • RSTP

Layer 2 Security

Identify the concepts, benefits, or operations 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 operations 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, operations, or functionalities of various protocol-independent routing components:

  • Static, aggregate, and generated routes
  • Martian addresses
  • Routing instances, including routing information base (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

OSPF

Describe the concepts, operations, or functionalities 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
  • Link-state advertisement (LSA) packet types

 

Demonstrate knowledge how to configure, monitor, or troubleshoot OSPF:

  • Areas, interfaces, and neighbors
  • Additional basic options
  • Routing policy application
  • Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)

IS-IS

Describe the concepts, operations, or functionalities of IS-IS:

  • Link-state database
  • IS-IS Protocol Data Units (PDUs)
  • Type, length, and values (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 (ping, traceroute, traceoptions, show commands, logging)

BGP

Describe the concepts, operations, or functionalities of BGP:

  • BGP basic operation
  • BGP message types
  • Attributes
  • Route/path selection process
  • Internal and external BGP (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 (ping, traceroute, traceoptions, show commands, logging)

Tunnels

Identify the concepts, requirements, or functionalities of IP tunneling:

  • Tunneling applications and considerations
  • Generic Routing Encapsulation (GRE)
  • IP-IP

 

Demonstrate knowledge of how to configure, monitor, or troubleshoot IP tunnels:

  • GRE
  • IP-IP
  • Troubleshooting tools (ping, traceroute, traceoptions, 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
  • 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
  • Graceful restart, GRES, NSB, and NSR
  • VRRP
  • ISSU
  • Troubleshooting tools (traceoptions, show commands, logging)

Exam Details

Exam questions are derived from the recommended training and the exam resources listed above. Pass/fail status is available immediately after taking the exam. The exam is only provided in English.

Exam Code

JN0-351

Prerequisite Certification

Delivered by

Exam Length

90 minutes

Exam Type

65 multiple-choice questions

Software Versions

  • Junos 23.1

Recertification

Juniper certifications are valid for three years. For more information, see Recertification.