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Enterprise Routing and Switching, Specialist (JNCIS-ENT)

This Enterprise Routing and Switching Certification Track enables you to demonstrate competence with networking technology in general and Juniper Networks enterprise routing and switching platforms. JNCIS-ENT, the specialist-level certification in this track, is designed for experienced networking professionals with beginner to intermediate knowledge of routing and switching implementations in Junos. The written exam verifies your basic understanding of routing and switching technologies and related platform configuration and troubleshooting skills.

Juniper JN0-351 Exam Information

Exam Code: JN0-351
Prerequisite Certification: JNCIA-Junos
Delivered by Pearson VUE
Exam Length: 90 minutes
Exam Type: 65 multiple-choice questions
Software Versions: Junos 23.1

Juniper JN0-351 Exam Topics

Layer 2 Switching or VLANs

Identify the concepts, operations, or functionalities of Layer 2 switching for the Junos OS:
Bridging components
Frame processing

Describe the concepts, benefits, or functionalities 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, operations, or functionalities of the Spanning Tree Protocol (STP):
STP and Rapid Spanning Tree Protocol (RSTP) concepts
Port roles and states
Bridge Protocol Data Units (BPDUs)
Convergence and reconvergence
 
Demonstrate knowledge how to configure, monitor, or troubleshoot Spanning Tree:
STP
RSTP

Layer 2 Security

Identify the concepts, benefits, or operations 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 operations 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, operations, or functionalities of various protocol-independent routing components:
Static, aggregate, and generated routes
Martian addresses
Routing instances, including routing information base (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, operations, or functionalities 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
Link-state advertisement (LSA.  packet types

Demonstrate knowledge how to configure, monitor, or troubleshoot OSPF:
Areas, interfaces, and neighbors
Additional basic options
Routing policy application
Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)

IS-IS

Describe the concepts, operations, or functionalities of IS-IS:
Link-state database
IS-IS Protocol Data Units (PDUs)
Type, length, and values (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 (ping, traceroute, traceoptions, show commands, logging)

BGP

Describe the concepts, operations, or functionalities of BGP:
BGP basic operation
BGP message types
Attributes
Route/path selection process
Internal and external BGP (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 (ping, traceroute, traceoptions, show commands, logging)

Tunnels

Identify the concepts, requirements, or functionalities of IP tunneling:
Tunneling applications and considerations
Generic Routing Encapsulation (GRE)
IP-IP

Demonstrate knowledge of how to configure, monitor, or troubleshoot IP tunnels:
GRE
IP-IP
Troubleshooting tools (ping, traceroute, traceoptions, 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
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
Graceful restart, GRES, NSB, and NSR
VRRP
ISSU
Troubleshooting tools (traceoptions, show commands, logging)

View Online Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Free Questions

1. Which operational mode command will show the VRRP priority?
A.  show vrrp detail
B.  show interfaces vrrp extensive 
C.  show vrrp summary 
D.  monitor interfaces vrrp
Answer: A
 
2. Which command shows you the status of the redundant trunk groups configured on an EX Series switch?
A.  show interfaces 
B.  show redundant-trunk-group 
C.  show spanning-tree interface 
D.  show ethernet-switching redundant-trunk-group
Answer: D
 
3. Which two tools are useful for monitoring inter-VLAN routing? (Choose two.)
A.  vlan-trace 
B.  GVRP 
C.  ping 
D.  traceroute
Answer: C, D
 
4. You must allow both untagged and tagged VLAN traffic to enter an interface on an EX Series switch. Which two methods satisfy this requirement?
(Choose two.)
A.  Configure the port with dual-mode VLAN tagging. 
B.  Configure the port using the voice VLAN feature. 
C.  Configure the port with the native-vlan-id parameter. 
D.  Configure the port with the access parameter.
Answer: B, C
 
5. Which protocol family must you configure to enable bridging on an interface of an EX Series switch?
A.  inet 
B.  inet-bridging 
C.  ethernet-switching 
D.  ethernet-bridging
Answer: C
 
6. What are three valid bridging mechanisms? (Choose three.)
A.  Forwarding 
B.  Refreshing 
C.  Flooding 
D.  Aging 
E.  Segmenting
Answer: A, C, D
 
7. A root bridge in an RSTP network is connected to other neighboring bridges using point-to-point links. Which combination of port types can exist on the root bridge?
A.  There can be some combination of designated ports and alternate ports. 
B.  There can be some combination of root ports and alternate ports. 
C.  All ports will be designated ports. 
D.  All ports will be root ports.
Answer: C
 
8. Which two statements regarding an STP BPDU Ethernet frame are true? (Choose two.)
A.  The source MAC address is always 01:80:C2:00:00:00. 
B.  The destination MAC address is always 01:80:C2:00:00:00. 
C.  The destination MAC address is the MAC address associated with the receiving interface. 
D.  The source MAC address is the MAC address associated with the transmitting interface.
Answer: B, D
 
9. Which statement is true regarding STP?
A.  All switch ports operating in the point-to-point mode have a quicker recovery time than switch ports operating in shared mode. 
B.  All switch ports must pass through the listening and learning states before they can be placed in the forwarding state. 
C.  Edge ports are automatically placed in the forwarding state when they are operational. 
D.  Nonedge ports must receive at least one keepalive every six seconds to remain operational.
Answer: B
 
10. Which is evaluated first when selecting a BGP route?
A.  MED 
B.  Origin
C.  Local preference 
D.  AS path
Answer: C