JNCIS-ENT exam topics are based on the content of the recommended instructor-led training courses, as well as the additional resources.

• Exam Code: JN0-348
• Written exam
• Administered by Pearson VUE
• Exam length: 90 minutes
• Exam type: 65 multiple-choice questions
• Pass/fail status is available immediately
• Software Release:
  • Junos 18.4
  • Junos Space Network Director 3.1

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

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

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

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

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)

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)

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)

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)

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)