JN0-351 Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam Info and Questions Sharing

Understand Juniper JN0-351 Exam Info

The JN0-351 Enterprise Routing and Switching, Specialist exam is a required one for the JNCIS-ENT certification, which is designed for networking professionals who already possess foundational Junos knowledge and want to validate their advanced understanding of Juniper enterprise routing and switching technologies. It is a highly recognized certification for IT pros aiming to strengthen their expertise in Juniper-driven enterprise infrastructure.

Certification Level: JNCIS-ENT
Question Format: 65 multiple-choice questions
Duration: 90 minutes
Software Versions Tested: Junos OS 23.1
Language: English
Scoring: Pass/Fail shown immediately after submission

Master Juniper JN0-351 Exam Topics

The updated JN0-351 exam evaluates competency across these critical routing & switching technology areas:

Layer 2 Switching and VLANs
VLAN tagging: 802.1Q, native VLANs
Access vs trunk ports
Voice VLANs, IRB for routing at Layer 3

Spanning Tree Protocol (STP)
RSTP (802.1w)
MSTP (802.1s)
Root bridge selection, port roles/state transitions
Juniper extensions to STP

Layer 2 Security
DHCP snooping
Dynamic ARP Inspection (DAI)
Storm control
MAC limiting

Protocol-Independent Routing (PIR)
Static routing concepts
Routing tables and route preferences
Route aggregation and redistribution

OSPF
Areas, DR/BDR roles
LSA types, neighbor states
Authentication and metric tuning

IS-IS
Level 1 vs Level 2 routing
TLVs
Adjacency formation and troubleshooting

BGP
Peering states and attributes
Route policies and filtering
iBGP vs eBGP behavior

Tunnels
GRE tunnel configuration and troubleshooting
IPv4/IPv6 encapsulation basics

High Availability (HA)
Graceful restart (GR)
Nonstop routing/forwarding (NSR/NSB)
Virtual Chassis redundancy roles

Exam Tips for Juniper JN0-351 Success

Spend time practicing Junos CLI on EX and QFX switches
Focus on routing policies and protocol troubleshooting
Review HA features – often overlooked but tested
Practice converting theory into real configuration scenarios
Use the official Juniper documentation and learning portal

The JNCIS-ENT certification is a strong validation of your skills in Juniper enterprise routing and switching environments. Mastering these technologies not only helps you pass the exam – it also elevates your credibility as a network engineer able to design, secure, and troubleshoot modern enterprise networks.