JUNIPER NETWORKSJuniper Networks Certified Specialist, Enterprise Routing and Switching (JNCIS-ENT)
The Juniper Networks Certified Specialist, Enterprise Routing and Switching (JNCIS-ENT) certification validates your ability to configure, monitor, and troubleshoot enterprise routing and switching technologies on Junos OS. Designed for experienced networking professionals, it covers Layer 2 switching, VLANs, spanning tree, OSPF, IS-IS, BGP, tunnels, and high availability. Earning JNCIS-ENT demonstrates the practical skills needed to manage Juniper enterprise networks effectively.
978 practice questions · Updated 2026-07-30
9Domains
56Objectives
340Concepts
978Questions
JN0-352 Curriculum
Every domain, objective, and concept the JN0-352 exam measures.
- Bridging Fundamentals
- MAC Address Learning
- Frame Forwarding and Filtering
- Broadcast and Unknown Unicast Flooding
- Loop Prevention in Bridged Networks
- Frame forwarding decision
- MAC address learning
- MAC address aging
- Unknown unicast flooding
- Broadcast and multicast handling
- Frame filtering
- VLAN tag processing
- Access port configuration
- Trunk port configuration
- Native VLAN on trunk ports
- VLAN tagging and untagging
- VLAN membership verification
- IEEE 802.1Q tagging
- Native VLAN and untagged traffic
- VLAN tagging on trunk ports
- VLAN tagging on access ports
- Inter-Switch Link (ISL) tagging
- VLAN tag propagation and pruning
- Troubleshooting VLAN tagging issues
- Native VLAN concept
- Native VLAN configuration
- Native VLAN mismatch issues
- Voice VLAN concept
- Voice VLAN configuration
- Voice VLAN verification
- Inter-VLAN routing overview
- Router-on-a-stick configuration
- Layer 3 switching for inter-VLAN routing
- VLAN trunking and encapsulation
- Routing between VLANs with static routes
- Troubleshooting inter-VLAN routing
- Layer 2 interface configuration
- Port modes and access/trunk configuration
- VLAN membership and tagging
- Link aggregation (LAG) and LACP
- Spanning Tree Protocol (STP) on interfaces
- Port security and storm control
- Monitoring interface status and statistics
- Troubleshooting common interface issues
- VLAN Configuration
- VLAN Monitoring
- VLAN Troubleshooting
- Inter-VLAN Routing Configuration
- Inter-VLAN Routing Monitoring
- Inter-VLAN Routing Troubleshooting
- STP Fundamentals
- STP Port Roles and States
- Bridge ID and Root Bridge Election
- Path Cost and Port Selection
- STP Timers
- RSTP Enhancements
- RSTP Convergence Mechanisms
- RSTP Port Roles and States
- RSTP BPDU Handling
- STP and RSTP Comparison
- Port roles in Spanning Tree Protocol
- Port states in Spanning Tree Protocol
- Relationship between port roles and states
- RSTP port roles and states
- Port role and state transitions
- BPDU Types and Purpose
- BPDU Fields and Structure
- BPDU Transmission and Reception
- BPDU Timers and Aging
- BPDU Handling in Topology Changes
- STP convergence process
- RSTP rapid convergence
- Convergence triggers
- Topology change notification
- Convergence optimization
- STP Fundamentals
- STP Configuration
- STP Monitoring
- STP Troubleshooting
- RSTP Fundamentals
- RSTP Port Roles and States
- RSTP Link Types and Edge Ports
- RSTP Configuration
- RSTP Monitoring
- RSTP Troubleshooting
- BPDU Protection
- Loop Protection
- Root Protection
- Interaction of Protection Mechanisms
- MAC limiting
- DHCP snooping
- Dynamic ARP inspection
- IP source guard
- MACsec Overview
- MACsec Terminology
- MACsec Frame Format
- MACsec Key Management
- MACsec Configuration on Junos
- MACsec Operation Modes
- MACsec Troubleshooting
- Storm Control Overview
- Storm Control Configuration
- Storm Control Actions
- Storm Control Monitoring
- Layer 2 firewall filter types
- Processing order of Layer 2 firewall filters
- Match criteria for Layer 2 firewall filters
- Actions in Layer 2 firewall filters
- Layer 2 protection mechanisms
- Port security basics
- Configuring port security
- Monitoring port security
- Troubleshooting port security
- Configuring BPDU protection
- Monitoring BPDU protection
- Troubleshooting BPDU protection
- Configuring root protection
- Monitoring root protection
- Troubleshooting root protection
- Configuring loop protection
- Monitoring loop protection
- Troubleshooting loop protection
- Storm control configuration
- Storm control monitoring
- Storm control troubleshooting
- Firewall filter configuration
- Firewall filter monitoring
- Firewall filter troubleshooting
- Static route configuration
- Static route preferences
- Static route metrics
- Static route failover
- Aggregate route configuration
- Aggregate route behavior
- Generated route configuration
- Generated route behavior
- Route preference and selection
- Definition of Martian addresses
- Common Martian address ranges
- Purpose of Martian address filtering
- Configuration of Martian address filters
- Verification of Martian address filtering
- Routing instances overview
- Configuring routing instances
- Routing information base (RIB) groups
- Using RIB groups with routing instances
- Verifying routing instances and RIB groups
- Load balancing overview
- Per-packet load balancing
- Per-flow load balancing
- Load balancing configuration
- Load balancing algorithms
- Verification of load balancing
- FBF overview
- FBF configuration
- FBF routing instances
- FBF firewall filter match criteria
- FBF forwarding actions
- FBF verification
- Static route configuration
- Static route monitoring
- Static route troubleshooting
- Dynamic routing protocol configuration
- Dynamic routing protocol monitoring
- Dynamic routing protocol troubleshooting
- Routing policy configuration
- Routing policy monitoring
- Routing policy troubleshooting
- Route preference and metrics
- Load balancing and ECMP
- Filtering and route maps
- Redistribution
- Route summarization
- Next-hop resolution
- Routing table verification
- Logging and tracing
- Link-state database
- OSPF packet types
- Router ID
- Neighbor and adjacency states
- Designated router and backup designated router
- OSPF area types
- OSPF router types
- OSPF realms
- LSA packet types
- OSPF area configuration
- OSPF interface parameters
- OSPF neighbor establishment
- OSPF neighbor troubleshooting
- OSPF area monitoring
- OSPF routing policy application
- OSPF troubleshooting tools
- Link-state database overview
- LSP contents
- LSP flooding
- Database synchronization
- LSP aging and refresh
- Database overload
- IS-IS PDU Types
- PDU Header Structure
- IIH PDUs
- LSP PDUs
- CSNP and PSNP PDUs
- TLVs in IS-IS PDUs
- PDU Encapsulation
- TLV basics
- Common IS-IS TLVs
- TLV length and format
- TLV usage in IS-IS PDUs
- IS-IS adjacency types
- Adjacency establishment process
- Adjacency states
- Adjacency parameters and mismatches
- Adjacency troubleshooting
- IS-IS area structure
- Level 1 and Level 2 routing
- Level 1-2 routers
- Area boundaries and routing information flow
- Route leaking between levels
- DIS election process
- DIS roles and responsibilities
- Pseudonode LSPs
- CSNP and PSNP usage
- DIS versus Level 1 and Level 2
- DIS failure and re-election
- IS-IS Metric Basics
- Wide vs Narrow Metrics
- Metric Configuration
- Metric Types
- Metric Calculation for Routes
- External and Internal Metrics
- Metric Propagation
- IS-IS levels
- IS-IS interfaces
- IS-IS adjacencies
- Monitoring IS-IS
- Troubleshooting IS-IS adjacencies
- Troubleshooting IS-IS levels
- IS-IS routing policy application
- IS-IS troubleshooting tools
- BGP Overview
- BGP Path Attributes
- BGP Route Selection Process
- BGP Peering and Sessions
- eBGP and iBGP
- BGP Message Types
- BGP Neighbor Configuration
- BGP Route Advertisement and Withdrawal
- BGP message types overview
- OPEN message
- UPDATE message
- NOTIFICATION message
- KEEPALIVE message
- BGP Attribute Categories
- Well-Known Mandatory Attributes
- Well-Known Discretionary Attributes
- Optional Transitive Attributes
- Optional Non-Transitive Attributes
- Attribute Propagation Rules
- BGP Path Selection and Attributes
- BGP route selection algorithm
- Highest local preference
- AS path length
- Origin type
- MED (Multi-Exit Discriminator)
- eBGP vs iBGP preference
- IGP metric to next hop
- Router ID and tie-breaking
- BGP Path Selection Basics
- Internal BGP (iBGP) Operation
- External BGP (eBGP) Operation
- iBGP and eBGP Interaction
- Next-Hop Handling in iBGP and eBGP
- BGP Attributes and Their Role in Path Selection
- Route Advertisement Rules
- BGP Peering and Session Establishment
- BGP group configuration
- BGP peer configuration
- BGP group and peer monitoring
- BGP group and peer troubleshooting
- BGP routing policy application
- Troubleshooting tools for BGP
- BGP route selection and policy interaction
- BGP error and state troubleshooting
- Tunneling applications
- Tunneling considerations
- GRE encapsulation basics
- GRE header structure
- GRE tunnel configuration
- GRE tunnel verification
- GRE and routing
- GRE and MTU considerations
- IP-IP tunnel overview
- IP-IP tunnel configuration
- IP-IP tunnel verification
- GRE tunnel configuration
- GRE tunnel monitoring
- GRE tunnel troubleshooting
- IP-IP tunnel basics
- IP-IP tunnel configuration
- IP-IP tunnel monitoring
- IP-IP tunnel troubleshooting
- Link aggregation groups
- LAG configuration
- LAG load balancing
- LACP (Link Aggregation Control Protocol)
- Redundant trunk groups
- Redundant trunk group configuration
- Redundant trunk group failover
- Virtual Chassis Overview
- Virtual Chassis Components
- Virtual Chassis Configuration
- Virtual Chassis Operations
- Virtual Chassis High Availability
- Graceful Restart Overview
- Graceful Restart Configuration
- Graceful Restart Helper Mode
- Graceful Routing Engine Switchover (GRES)
- GRES Configuration and Verification
- Nonstop Active Routing (NSR)
- NSR Configuration and Verification
- Nonstop Bridging (NSB)
- NSB Configuration and Verification
- Interaction of HA Features
- BFD Overview
- BFD Configuration
- BFD Sessions and States
- BFD for Routing Protocols
- VRRP Overview
- VRRP Operation
- VRRP Configuration
- VRRP Tracking and Failover
- Unified In-Service Software Upgrade (ISSU) Overview
- ISSU Requirements and Limitations
- ISSU Process and Phases
- ISSU Commands and Verification
- ISSU Failure Recovery and Rollback
- High Availability Feature Configuration
- High Availability Monitoring
- High Availability Troubleshooting
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Percentages reflect share of the current practice bank, not official exam weightings — no structured per-skill weight is published for JN0-352, so none is invented.