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Exam Review

Key Facts: JNCIS-ENT Exam

JN0-352

Current Exam Code

Juniper JNCIS-ENT exam page, checked 2026-10-18

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 review concepts for the JNCIS-ENT exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 162+ 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.

Exam sponsor: Juniper Networks / Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

65 questions

Time Limit

90 minutes

Passing Score

Not publicly published

Exam / Certification Fees

$300

Exam sponsor website

Reported exam pass rate: Not published. No official pass rate is published by Juniper. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Layer 2 Switching or VLANs

Bridging, frame processing, ports, tags, native and voice VLANs, inter-VLAN routing

Not published

Spanning Tree

STP/RSTP concepts, port roles and states, BPDUs, convergence and diagnostics

Not published

Layer 2 Security

BPDU/loop/root protection, MAC limits, snooping, DAI, IP source guard, MACsec, storm control and Layer 2 filters

Not published

Protocol Independent Routing

Static, aggregate and generated routes, martians, instances, RIB groups, load balancing and FBF

Not published

OSPF

LSDB, packets, router ID, neighbors, DR/BDR, areas, realms, LSAs, policy and diagnostics

Not published

IS-IS

LSDB, PDUs, TLVs, levels, neighbors, DIS, metrics, policy and diagnostics

Not published

BGP

Messages, attributes, path selection, IBGP/EBGP, groups, peers, policy and diagnostics

Not published

Tunnels

IP tunneling applications, GRE, IP-IP, configuration and troubleshooting

Not published

High Availability

LAG, RTG, Virtual Chassis, GR, GRES, NSR, NSB, BFD, VRRP and ISSU

Preparing for the JNCIS-ENT Exam

What You Need to Know

  • Passing score: Not publicly published
  • Exam length: 65 questions
  • Time limit: 90 minutes
  • Exam / certification fees: $300 Official sources

Using Our Practice Resources

  • Work through all 162 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

JNCIS-ENT: Suggested Study Strategy

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?

The current JNCIS-ENT exam is JN0-352: 65 multiple-choice questions in English, with 90 minutes, delivered by Pearson VUE. Juniper does not publicly publish the passing score. Candidates receive a score report with section results and the passing score for the exam taken; a passing result is provisional pending validation.

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 recommends Junos Intermediate Routing (JIR) and Junos Enterprise Switching (JEX), along with the current objectives, practice exams and exam preparation webinars. Check the Learning Portal for current delivery options, access terms and prices; the recommended courses are not exam prerequisites.