Nonstop Active Routing (NSR) JN0-364 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A network engineer is configuring NSR on a router that runs BGP and IS-IS. The engineer wants to ensure that both protocols are synchronized to the backup RE. Which statement correctly describes how NSR handles the synchronization of BGP and IS-IS?

   • ANSR synchronizes the routing table but not the protocol adjacencies for BGP and IS-IS.
   • BNSR synchronizes only the IS-IS state, while BGP must rely on Graceful Restart for high availability.
   • CNSR synchronizes only the BGP state, while IS-IS must rely on Graceful Restart for high availability.
   • DNSR synchronizes the full BGP and IS-IS protocol state, including adjacencies and route information, to the backup RE.
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2. 22expert · hard

   A network engineer is planning to enable NSR on a pair of MX240 routers. The routers have dual REs, but the backup RE has less memory than the primary RE. The engineer has confirmed that GRES is enabled and that both REs run the same Junos version. What should the engineer do to enable NSR on these routers?

   • AUpgrade the backup RE to have the same amount of memory as the primary RE before enabling NSR.
   • BConfigure NSR with the 'partial-sync' option to allow the backup RE to synchronize only essential state.
   • CDisable GRES and enable NSR, as NSR does not require GRES to be enabled.
   • DEnable NSR anyway, as the backup RE will synchronize only the routing table, not the full protocol state.
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4. 23foundation · easy

   Which routing protocol is fully supported by NSR, meaning its session state is synchronized to the standby RE?

   • AMulticast (PIM)
   • BRIP
   • CStatic routes
   • DBGP
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5. 24foundation · easy

   What is a hardware constraint that can limit the effectiveness of NSR?

   • AThe device has limited memory on the Routing Engines.
   • BThe device has only one Routing Engine.
   • CThe device uses a single forwarding engine.
   • DThe device does not support GRES.
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6. 25foundation · easy

   How does NSR synchronize routing state between the active and standby Routing Engines?

   • AIt uses a dedicated hardware link to mirror all packets to the standby RE.
   • BIt periodically copies the entire routing table to the standby RE.
   • CIt relies on the standby RE to learn routes independently from neighbors.
   • DIt replicates protocol state information (e.g., BGP session state, OSPF adjacency state) from the active RE to the standby RE in real time.
   Reveal Solution Discussion Select an answer first