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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Topic 2	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 3	High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Topic 4	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q36-Q41):

NEW QUESTION # 36
What are two interarea OSPF LSA types? (Choose two.)

A. Type 1 router LSAs
B. Type 2 network LSAs
C. Type 4 ASBR summary LSAs
D. Type 3 summary LSAs

Answer: C,D

NEW QUESTION # 37
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system?
(Choose two.)

A. IBGP sessions must be configured as a physical full mesh.
B. Routes learned from IBGP neighbors are only advertised to other IBGP neighbors.
C. Routes learned from IBGP neighbors are not readvertised to other IBGP neighbors.
D. IBGP sessions must be configured as a logical full mesh.

Answer: C,D

Explanation:
BGP has a simple loop prevention mechanism for eBGP that checks the AS path for its own AS number.
However, this mechanism does not work for iBGP, since all routers in the same AS have the same AS number. Therefore, iBGP has two additional rules to prevent routing loops within an autonomous system:
A router does not advertise a route learned from an iBGP neighbor to another iBGP neighbor. This rule ensures that a route does not loop back to the original iBGP router through another iBGP path.
A router does not accept a route learned from an iBGP neighbor if the next hop is not reachable via an IGP.
This rule ensures that a router does not forward packets to an unreachable next hop.
These two rules imply that iBGP sessions must be configured as a logical full mesh, meaning that every iBGP router must have a direct iBGP session with every other iBGP router in the same AS. This way, every iBGP router can learn the best route from the eBGP routers and use the IGP to reach the next hop. A logical full mesh does not require a physical full mesh, meaning that iBGP routers do not have to be directly connected.
They can use intermediate routers to establish iBGP sessions, as long as the IGP can reach the next hop.
A logical full mesh can be challenging to scale and maintain, especially for large ASes with many iBGP routers. Therefore, some alternatives to the full mesh requirement have been developed, such as route reflectors and confederations. These alternatives relax the iBGP rules and introduce additional attributes and mechanisms to prevent routing loops, such as originator ID and cluster list. References:
BGP Fundamentals
BGP - eBGP loop prevention mechanism same AS number
Loop Prevention in BGP Routing

NEW QUESTION # 38
Which statement correctly describes the function of the Junos OS "family ethernet-switching" configuration on an interface?

A. It disables all Layer 2 functionality on the interface.
B. It configures the interface to operate as a Layer 2 switch port, participating in VLANs.
C. It configures the interface for Layer 3 routing only.
D. It is required only for aggregated Ethernet interfaces.

Answer: B

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 # 39
Referring to the exhibit, which statement is correct?

A. The local device is using a bridge priority of 4k.
B. The root bridge has not been elected for this RSTP topology.
C. The local device is the root bridge for this RSTP topology.
D. The root bridge is using a bridge priority of 4k.

Answer: D

Explanation:
The "Root ID" shows 4096.00:19:e2:55:36:1e. The first part of this ID, 4096, is the bridge priority of the root bridge.
The local bridge ID is shown as 32768.00:19:e2:55:1d:30, indicating that the local device has a default bridge priority of 32768, which is higher (and thus less preferred) than 4096.
Thus, the root bridge has a priority of 4096, and the local device is not the root bridge. The local device is participating in the RSTP topology and has identified another bridge as the root.

NEW QUESTION # 40
Which two statements are correct about Junos OS Nonstop Active Routing (NSR)? (Choose two.)

A. NSR is only supported for static routing.
B. NSR allows a Routing Engine switchover to occur without neighboring routers detecting any disruption.
C. NSR maintains routing protocol state synchronization between the master and backup Routing Engines.
D. NSR requires graceful restart to be enabled on neighboring routers.

Answer: B,C

Explanation:
Nonstop Active Routing (NSR) synchronizes routing protocol state information, such as OSPF and BGP adjacencies, between the master and backup Routing Engines in real time. This allows a switchover between Routing Engines to occur transparently, without requiring cooperation or awareness from neighboring routers, unlike graceful restart which does require neighbor support.

NEW QUESTION # 41
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