JNCIS-ENT

Designed for experienced networking professionals with beginner to intermediate knowledge of routing and switching implementations in Junos, this written exam verifies the candidate’s basic understanding of routing and switching technologies and related platform configuration and troubleshooting skills.

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)

Exam Details

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

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