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100+ Free JNCIS-ENT Practice Questions

Pass your Juniper JNCIS-ENT Enterprise Routing and Switching exam on the first try — instant access, no signup required.

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What is the purpose of the 'interface-range' configuration in Junos?

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2026 Statistics

Key Facts: JNCIS-ENT Exam

60-70%

Est. Pass Rate

Industry estimate

65 Q's

Exam Questions

Juniper

90 min

Exam Duration

Juniper

$300

Exam Fee

Juniper

3 years

Cert Valid

Juniper

100-150 hrs

Study Time

Recommended

JNCIS-ENT is Juniper's intermediate enterprise routing and switching certification. The exam has 65 questions in 90 minutes. It covers OSPF, IS-IS, BGP, Layer 2 switching, routing policy, and high availability. JNCIA-Junos is a prerequisite. Certification is valid for 3 years.

Sample JNCIS-ENT Practice Questions

Try these sample questions to test your JNCIS-ENT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In Junos OS, which routing table is used for IPv4 unicast routes by default?
A.inet.0
B.inet.1
C.inet.2
D.inet.3
Explanation: In Junos OS, inet.0 is the default routing table for IPv4 unicast routes. inet.1 is used for multicast forwarding cache, inet.2 is for unicast routes used for multicast RPF checks, and inet.3 contains routes learned via MPLS for BGP next-hop resolution. Understanding routing table structure is fundamental to Junos administration.
2What is the default OSPF hello interval on broadcast and point-to-point networks in Junos?
A.5 seconds
B.10 seconds
C.30 seconds
D.40 seconds
Explanation: The default OSPF hello interval on broadcast and point-to-point networks in Junos is 10 seconds. The dead interval defaults to 4 times the hello interval (40 seconds). On NBMA networks, the hello interval is 30 seconds with a 120-second dead interval. These timers must match between OSPF neighbors for adjacency formation.
3Which STP variant does Junos OS use by default on EX Series switches?
A.STP (802.1D)
B.RSTP (802.1w)
C.MSTP (802.1s)
D.VSTP
Explanation: Junos OS on EX Series switches uses RSTP (Rapid Spanning Tree Protocol, IEEE 802.1w) by default. RSTP provides faster convergence than traditional STP (802.1D) by introducing new port roles and states. MSTP (802.1s) and VSTP (VLAN Spanning Tree Protocol, Juniper's per-VLAN STP implementation) must be explicitly configured.
4In Junos routing policy, what does the 'then accept' action do when applied to a BGP import policy?
A.It accepts the route and stops evaluating further policy terms
B.It accepts the route but continues evaluating subsequent terms
C.It accepts the route only if all conditions match
D.It logs the route and continues processing
Explanation: In Junos routing policy, 'then accept' is a terminating action that accepts the route and immediately stops evaluating any remaining terms or policies in the chain. This is a critical concept in Junos: accept and reject are terminating actions, while 'then next term' and 'then next policy' are flow control actions that allow continued evaluation.
5What is the purpose of Junos Graceful Restart (GR)?
A.To restart the routing engine without affecting forwarding
B.To allow a router to maintain forwarding state and neighbor relationships during a routing engine restart, minimizing traffic disruption
C.To perform a software upgrade without rebooting
D.To restart individual routing protocols independently
Explanation: Graceful Restart allows a router to maintain its forwarding table and continue forwarding traffic while the routing engine restarts. Neighbors are notified that the router is performing a graceful restart and retain their adjacencies and routes. After the routing engine comes back up, routing protocols reconverge without a full adjacency reset, minimizing traffic disruption during planned or unplanned restarts.
6Which OSPF LSA type describes external routes redistributed into OSPF?
A.Type 1 (Router LSA)
B.Type 3 (Summary LSA)
C.Type 5 (External LSA)
D.Type 7 (NSSA External LSA)
Explanation: Type 5 External LSAs describe routes redistributed into OSPF from external sources (static routes, BGP, other routing protocols). They are generated by ASBRs (Autonomous System Boundary Routers) and flooded throughout the OSPF domain, except into stub and NSSA areas. In NSSA areas, external routes are carried by Type 7 LSAs, which are converted to Type 5 at the ABR.
7In Junos, what command displays the active routing table?
A.show route
B.show ip route
C.display routing-table
D.get route all
Explanation: The 'show route' command in Junos displays the contents of the routing table, showing all active and inactive routes. Additional flags can filter the output: 'show route table inet.0' for IPv4 unicast, 'show route protocol ospf' for OSPF routes, and 'show route active-path' for only active routes. Junos uses a different CLI syntax than IOS-based platforms.
8What is the default BGP hold time in Junos?
A.60 seconds
B.90 seconds
C.180 seconds
D.240 seconds
Explanation: The default BGP hold time in Junos is 90 seconds, with keepalive messages sent every 30 seconds (one-third of the hold time). If no keepalive or update message is received within the hold time, the BGP session is considered down. These timers are negotiated during BGP session establishment, and the lower value from either peer is used.
9In Junos, what is a firewall filter?
A.A stateful firewall feature like SRX security policies
B.A packet classification mechanism applied to interfaces for filtering, rate limiting, policing, and marking traffic
C.A filter applied to management traffic only
D.A mechanism to filter routes in the routing table
Explanation: In Junos, a firewall filter (also called an ACL in other platforms) is a stateless packet classification mechanism applied to interfaces to filter, rate-limit, police, and mark traffic. Firewall filters operate at Layer 3/4 and are configured under 'firewall family inet filter'. They consist of terms with match conditions and actions. Unlike SRX security policies, firewall filters are stateless.
10What is a trunk port in the context of Junos EX Series switching?
A.A port that connects to a server
B.A port that carries traffic for multiple VLANs using 802.1Q tagging
C.A port that provides uplink to the internet
D.A port configured for LACP aggregation
Explanation: A trunk port on a Junos EX Series switch carries traffic for multiple VLANs using IEEE 802.1Q tagging. Each frame on a trunk port includes a VLAN tag identifying which VLAN it belongs to. Trunk ports are typically used for switch-to-switch interconnections and connections to hypervisors. In Junos, trunk mode is configured with 'set interfaces ge-0/0/0 unit 0 family ethernet-switching interface-mode trunk'.

About the JNCIS-ENT Exam

JNCIS-ENT validates intermediate knowledge of Junos enterprise routing and switching including OSPF, IS-IS, BGP, VLANs, STP, routing policy, firewall filters, and high availability features on Juniper EX and MX platforms.

Questions

100 scored questions

Time Limit

90 minutes

Passing Score

Pass/Fail

Exam Fee

$300 (Juniper Networks / Pearson VUE)

JNCIS-ENT Exam Content Outline

25%

OSPF & IS-IS

OSPF areas, LSA types, DR election, IS-IS levels, metrics, authentication

20%

BGP

eBGP/iBGP, route selection, communities, route reflection, as-path manipulation

20%

Layer 2 Switching

VLANs, RSTP/MSTP, LACP, IRB, port security, DHCP snooping, storm control

20%

Routing Policy & Filters

Policy statements, prefix lists, route filters, firewall filters, policers

15%

High Availability

VRRP, graceful restart, GRES, NSR, BFD, virtual chassis, commit confirmed

How to Pass the JNCIS-ENT Exam

What You Need to Know

  • Passing score: Pass/Fail
  • Exam length: 100 questions
  • Time limit: 90 minutes
  • Exam fee: $300

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

JNCIS-ENT Study Tips from Top Performers

1Master Junos routing policy — understand terminating actions (accept/reject) vs flow control (next term/next policy)
2Know OSPF LSA types (1-7) and which types are blocked by stub, totally stubby, and NSSA areas
3Practice BGP route selection order: local-pref > AS-path > origin > MED > eBGP > IGP metric > router-id
4Understand the difference between 'family inet' and 'family ethernet-switching' on interfaces
5Study VRRP, GRES, and NSR — know which problems each high availability feature solves

Frequently Asked Questions

What is the JNCIS-ENT exam format?

JNCIS-ENT has 65 multiple-choice and multi-select questions in 90 minutes. The exam is pass/fail — Juniper does not publish the exact passing score. It is delivered at Pearson VUE centers and online.

Do I need JNCIA-Junos before taking JNCIS-ENT?

Yes, JNCIA-Junos certification is a prerequisite. You must hold a current JNCIA-Junos before attempting JNCIS-ENT. JNCIA covers Junos OS fundamentals that JNCIS builds upon.

How does JNCIS-ENT compare to Cisco CCNA?

JNCIS-ENT is roughly equivalent to CCNA/CCNP level. It covers intermediate routing and switching concepts specific to Junos OS. JNCIA-Junos is closer to CCNA entry level, while JNCIS covers more advanced topics.

What study resources are available?

Juniper offers free online courses through the Learning Portal, including JRE (Junos Routing Essentials) and JEX (Junos Enterprise Switching). Official study guides and lab access through vLabs are also available.