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Juniper JN0-349 exam : Enterprise Routing and Switching, Specialist (JNCIS-ENT)

JN0-349 Exam Questions
  • Exam Code: JN0-349
  • Exam Name: Enterprise Routing and Switching, Specialist (JNCIS-ENT)
  • Updated: Jul 16, 2026
  • Q & A: 112 Questions and Answers
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JN0-349 exam dumps

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Juniper JN0-349 Exam Certification Details:

Exam RegistrationPEARSON VUE
Recommended TrainingJunos Intermediate Routing (JIR)
Junos Enterprise Switching (JEX)
Number of Questions65
Passing ScoreVariable (60-70% Approx.)
Exam Price$300 USD
Sample QuestionsJuniper JN0-349 Sample Questions
Exam NameEnterprise Routing and Switching Specialist
Exam CodeJN0-349 JNCIS-ENT
Duration90 minutes

Available for abundant exercises

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Juniper JN0-349 Exam Topics:

SectionObjectives
Spanning TreeDescribe 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 Spanning Tree

  • STP
  • RSTP
OSPFDescribe 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 SecurityIdentify 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
Protocol Independent RoutingIdentify 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 Switching or VLANsIdentify 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
  • Inter-VLAN Routing
High AvailabilityIdentify 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)
TunnelsIdentify the concepts, requirements or functionality of IP tunneling
  • Tunneling applications and considerations
  • GRE
  • IP-IP

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

  • GRE
  • IP-IP
  • Troubleshooting tools (e.g., ping, traceroute, trace options, show commands, logging)
BGPDescribe 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)
IS-ISDescribe 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)

Reference: https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-349 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Protocol Independent Routing10%- Route filters and routing policies
- Aggregate routes
- Static routes
- Load balancing and failover
Topic 2: BGP15%- BGP configuration (peer groups, route reflection)
- BGP attributes and policies
- Multihop BGP and route flaps
- BGP operations and path selection
Topic 3: High Availability10%- In-Service Software Upgrade (ISSU)
- Virtual Chassis Fabric
- Nonstop active routing (NSR)
- Virtual Chassis
- Graceful Routing Engine Switchover (GRES)
Topic 4: Layer 2 Security8%- DHCP snooping
- Dynamic ARP inspection
- Layer 2 firewall filtering
- Port security features
Topic 5: Spanning Tree Protocols10%- STP operations (802.1D, 802.1w, 802.1s)
- Loop protection features
- BPDU protection and Root guard
- STP configuration and troubleshooting
Topic 6: OSPF15%- OSPFv2 operations and adjacencies
- OSPF configuration and troubleshooting
- OSPF area types (Stub, NSSA, Totally Stub)
- OSPF LSA types and LSAs
Topic 7: Class of Service (CoS)10%- Classification and policing
- Queueing and scheduling
- Shaping and rewriting rules
- CoS components and terminology
Topic 8: IP Telephony Features5%- Power over Ethernet (PoE)
- LLDP-MED operations
- VoIP VLAN configuration
Topic 9: Tunneling5%- IPsec tunnels
- Tunnel interfaces and configuration
- GRE tunnels
Topic 10: Layer 2 Switching and VLANs12%- VLAN tagging (802.1Q)
- Layer 2 switching operations
- Logical interfaces
- VLAN implementation and configuration

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