Juniper JN0-351 New Test Materials - JN0-351 Exam Guide

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q47-Q52):

NEW QUESTION # 47
In RSTP, which three port roles are associated with the discarding state? (Choose three.)

Answer: C,D,E

Explanation:
Explanation
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree123. The roles include root, designated, alternate, backup, and disabled123.
The discarding state is associated with the backup, alternate, and disabled roles123. In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state2. Disabled ports are also in the discarding state3.
Therefore, options B, C, and D are correct.


NEW QUESTION # 48
You are asked to create a default route that will be advertised to your internal OSPF neighbors.
You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available. Which solution should you implement in this scenario?

Answer: D


NEW QUESTION # 49
Which two statements about MACsec are true? (Choose two.)

Answer: A,B


NEW QUESTION # 50
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems?
(Choose two.)

Answer: A,B

Explanation:
Explanation
BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.
Option A is correct. When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1. This is a key mechanism in BGP to prevent routing loops1.
Option C is correct. BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2. This helps to prevent routing loops2.
Option B is incorrect. EBGP routers do not accept routes that contain their own AS number in the AS_PATH2. Instead, they drop such routes as part of the loop prevention mechanism2.
Option D is incorrect. While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1. The term "prepend" in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.


NEW QUESTION # 51
What is the default hello interval on an OSPF interface?

Answer: D

Explanation:
The default hello interval on an OSPF interface depends on the network type of the interface. For point-to- point and broadcast network types, the default hello interval is 10 seconds. For non-broadcast and point-to- multipoint network types, the default hello interval is 30 seconds. The hello interval is the time between sending hello packets to establish and maintain neighbor adjacencies. The hello interval can be configured manually on each interface using the ip ospf hello-interval command. References:
* OSPF Hello and Dead Interval - NetworkLessons.com
* OSPF Hello and Dead Interval: Operation and Configuration
* Adjusting OSPF Timers - Cisco IOS Cookbook, 2nd Edition
* ospf timer hello - WLAN AC V200R010C00 Command Reference - Huawei
* OSPF Timers - Hello and Dead Intervals - Packet Lab


NEW QUESTION # 52
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