A service provider has a pair of MX480 routers configured with NSR. During a routine test, the network team forces a switchover from RE0 to RE1. Which behavior should the team expect to observe during and immediately after the switchover?

BGP and OSPF adjacencies remain established, and the forwarding table is preserved without any disruption to traffic.

The forwarding table is rebuilt from the routing table, causing a brief interruption while the new RE learns the routes.

BGP adjacencies drop and reconverge, but OSPF adjacencies remain established because OSPF has a faster hello timer.

All protocol adjacencies remain established, but the forwarding table is cleared and must be repopulated by the routing protocols.

A network architect is comparing NSR and GRES for a new deployment. The architect needs a solution that preserves the forwarding table during an RE switchover but does not require the backup RE to maintain protocol adjacencies. Which solution should the architect choose?

Unified In-Service Software Upgrade (ISSU)

A network engineer is troubleshooting an NSR issue on a dual-RE router. The engineer has confirmed that NSR is configured and that the backup RE is eligible. However, the 'show task replication' command shows that BGP is not replicating to the backup RE. What is the most likely cause of this issue?

The BGP session is configured with the passive option, which prevents NSR from replicating the session.

The BGP process on the backup RE is not running or has crashed.

The BGP session is using a loopback address, which NSR does not support for replication.

The BGP group is configured with the graceful-restart option, which overrides NSR replication.

During an NSR switchover, what happens to traffic forwarding?

Traffic forwarding continues because the forwarding table is preserved by GRES.

Traffic forwarding is interrupted until the new active RE rebuilds the forwarding table.

Traffic is rerouted through a backup path automatically.

Traffic is dropped until all routing protocols reconverge.

What is the key difference between NSR and Graceful Routing Engine Switchover (GRES)?

GRES preserves the forwarding table, while NSR also preserves routing protocol state and adjacencies.

GRES preserves the control plane, while NSR preserves the forwarding table.

GRES requires a single Routing Engine, while NSR requires two.

GRES is used for software upgrades, while NSR is used for hardware failures.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 10Objective 5

Nonstop Active Routing (NSR) JN0-364 Practice Questions (Page 4)

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 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

9concepts

Questions 16–20

16application · medium
A service provider has a pair of MX480 routers configured with NSR. During a routine test, the network team forces a switchover from RE0 to RE1. Which behavior should the team expect to observe during and immediately after the switchover?
Select an answer first
17application · medium
A network architect is comparing NSR and GRES for a new deployment. The architect needs a solution that preserves the forwarding table during an RE switchover but does not require the backup RE to maintain protocol adjacencies. Which solution should the architect choose?
Select an answer first
18application · medium
A network engineer is troubleshooting an NSR issue on a dual-RE router. The engineer has confirmed that NSR is configured and that the backup RE is eligible. However, the 'show task replication' command shows that BGP is not replicating to the backup RE. What is the most likely cause of this issue?
Select an answer first
19foundation · easy
During an NSR switchover, what happens to traffic forwarding?
Select an answer first
20foundation · easy
What is the key difference between NSR and Graceful Routing Engine Switchover (GRES)?
Select an answer first

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