Pass Guaranteed 2026 Accurate JN0-351: New Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam Questions

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Juniper JN0-351 Exam Syllabus Topics:

SectionObjectives
High Availability- Virtual Chassis, redundant routing engines
- Graceful restart, nonstop active routing
- Configuration, monitoring and troubleshooting
BGP- IBGP, EBGP, route policies
- Configuration, monitoring and troubleshooting
- BGP concepts, attributes, path selection
Layer 2 Security- Layer 2 firewall filters
- Port security, storm control, MAC limiting
- Dynamic ARP inspection, DHCP snooping
- Configuration, monitoring and troubleshooting
Protocol Independent Routing- Routing policy and firewall filters
- Static routes, aggregate routes
- Routing tables, routing preferences
- Configuration, monitoring and troubleshooting
Spanning Tree Protocol- Root bridge, port roles and states
- STP, RSTP, MSTP concepts and operation
- Configuration, monitoring and troubleshooting
Layer 2 Switching and VLANs- Inter-VLAN routing
- Layer 2 switching concepts and operation
- VLAN concepts, tagging, ports, native VLAN
- Configuration, monitoring and troubleshooting
IS-IS- IS-IS concepts, levels, routing information
- Configuration, monitoring and troubleshooting
OSPF- Neighbor relationships, route calculation
- OSPFv2/v3 concepts, areas, LSA types
- Configuration, monitoring and troubleshooting
Tunnels- IP-IP, GRE, IPsec tunnels
- Configuration, monitoring and troubleshooting

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q152-Q157):

NEW QUESTION # 152
What is the default keepalive time for BGP?

Answer: C

Explanation:
Default BGP keepalive timer in Junos is 30 seconds
The default keepalive time for BGP is 30 seconds, which means that BGP peers send keepalive messages to each other every 30 seconds to verify the liveness of the BGP session. If no keepalive message is received from a peer within the hold time, which is 90 seconds by default, the peer is considered to be unavailable and the BGP session is closed. The keepalive time and the hold time can be configured manually for each BGP peer or peer group, but they must match on both ends of the BGP session. The keepalive time should be one third of the hold time for optimal performance. Therefore, option C is correct and the other options are incorrect. References: BGP keepalive messages and hold time - Juniper Networks


NEW QUESTION # 153
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

Answer: D

Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.


NEW QUESTION # 154
You are receiving the BGP route shown in the exhibit from four different upstream ISPs.
Referring to the exhibit, which ISP will be selected as the active path?

Answer: B

Explanation:
In BGP, the path selection process is based on a set of attributes. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on. If all these attributes are the same, then it prefers the path with the shortest AS path.
Referring to the exhibit, all four ISPs have the same weight, local preference, and origin.
However, ISP 4 has the shortest AS path. Therefore, ISP 4 will be selected as the active path.
So, option C is correct.


NEW QUESTION # 155
Which two events cause a router to advertise a connected network to OSPF neighbors? (Choose two.)

Answer: B,D


NEW QUESTION # 156
Which statement correctly describes the function of the Junos OS "family ethernet-switching" configuration on an interface?

Answer: D

Explanation:
Configuring "family ethernet-switching" on a Junos OS interface enables Layer 2 switching functionality, allowing the interface to participate as an access or trunk port within one or more VLANs. This is a prerequisite for standard VLAN-based Layer 2 forwarding on EX Series switches.


NEW QUESTION # 157
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