Exam: JN0-349
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Exam Details
Exam questions are derived from the recommended training and the exam
resources listed above. Pass/fail status is available immediately after taking
the exam. The exam is only provided in English.
Exam Code: JN0-349
Prerequisite Certification: JNCIA-Junos
Delivered by: Pearson VUE
Exam Length: 90 minutes
Exam Type: 65 multiple-choice questions
Software Versions: Junos 21.1
Recertification
Juniper certifications are valid for three years. For more information, see
Recertification.
Exam Objectives
Here’s a high-level view of the skillset required to successfully complete
the JNCIS-ENT certification exam.
Exam Objective
Layer 2 Switching or VLANs
Identify 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
Spanning Tree
Describe 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
Layer 2 Security
Identify 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 Routing
Identify 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
OSPF
Describe 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)
IS-IS
Describe 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)
BGP
Describe 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)
Tunnels
Identify 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)
High Availability
Identify 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)
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