What is the primary purpose of Nonstop Active Routing (NSR) in Junos?

To maintain Layer 2 forwarding state during a switchover

To allow a routing protocol process to restart without dropping adjacencies

To provide a backup forwarding table on the backup RE

To synchronize routing protocol state between Routing Engines to avoid routing flaps during a switchover

You are troubleshooting a dual-RE router that is experiencing routing flaps during a Routing Engine switchover. You have confirmed that GRES is enabled and the forwarding table is preserved. However, OSPF neighbors are still detecting a restart and reconverging. What is the most likely cause?

The OSPF hold time is too short.

The standby RE is not ready for switchover.

Graceful restart is not enabled for OSPF.

You are deploying a new dual-RE MX960 as a core router. The router will run OSPF, BGP, and Layer 2 bridging. You want to achieve the highest level of high availability with the least amount of configuration complexity. Which configuration approach should you take?

Enable GRES, NSR, and NSB, and also configure graceful restart for all protocols.

Enable only GRES and graceful restart for all protocols.

Enable GRES and NSR, and configure NSB for Layer 2.

Which Junos configuration statement enables NSR?

set routing-options nonstop-routing

set chassis redundancy nonstop-routing

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 9Objective 3

Routing and Forwarding High Availability JN0-352 Practice Questions (Page 5)

Part of the High Availability domain, which makes up ~12% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~4–7 in this domain), expect 1–1 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

10concepts

Questions 21–25

21foundation · easy
What is the primary purpose of Nonstop Active Routing (NSR) in Junos?
Select an answer first
22expert · hard
You are troubleshooting a dual-RE router that is experiencing routing flaps during a Routing Engine switchover. You have confirmed that GRES is enabled and the forwarding table is preserved. However, OSPF neighbors are still detecting a restart and reconverging. What is the most likely cause?
Select an answer first
23expert · hard
You are deploying a new dual-RE MX960 as a core router. The router will run OSPF, BGP, and Layer 2 bridging. You want to achieve the highest level of high availability with the least amount of configuration complexity. Which configuration approach should you take?
Select an answer first
24foundation · easy
Which Junos configuration statement enables NSR?
Select an answer first
25foundation · easy
Which command would you use to verify that NSB is preserving the bridging table during a switchover?
Select an answer first

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