2.8 Implement High Availability 350-501 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A service provider is implementing NSF on its core routers running BGP. The engineer wants to ensure that BGP sessions do not flap during a route processor switchover. Which additional feature must be enabled on the BGP neighbors to make NSF effective?

   • ABFD on the BGP sessions
   • BGraceful restart on the BGP neighbors
   • CLink aggregation on the BGP links
   • DNSR on the BGP neighbors
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   In the graceful restart mechanism for routing protocols, what role do neighboring routers play?

   • AThey continue to advertise routes and assist the restarting router in rebuilding its routing table
   • BThey take over the forwarding responsibilities of the restarting router
   • CThey immediately withdraw all routes learned from the restarting router to prevent loops
   • DThey restart their own routing processes to synchronize with the restarting router
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A network engineer is troubleshooting slow convergence in an OSPF network. The current OSPF dead interval is 40 seconds, and the engineer wants to reduce failure detection time without changing the OSPF timers. Which mechanism should be enabled?

   • AGraceful restart for OSPF
   • BLink aggregation on the OSPF links
   • CBFD on the OSPF interfaces
   • DNSF on the OSPF routers
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A service provider is designing a high-availability network. The engineer wants to ensure that a link failure between two PE routers is detected in less than one second. The routing protocol in use is OSPF with default timers. Which solution should be implemented?

   • AConfigure a PortChannel between the routers
   • BEnable BFD on the OSPF interfaces
   • CEnable graceful restart on OSPF
   • DEnable NSF on the routers
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A network engineer is configuring graceful restart for BGP on a PE router that connects to several customer CE routers. The CE routers are from a vendor that supports BGP graceful restart. During a maintenance window, the PE router's route processor will restart. What is the primary benefit of enabling graceful restart on this BGP session?

   • AThe PE router will continue to forward packets using the existing FIB without interruption.
   • BThe PE router will synchronize its BGP table to the standby route processor before the restart.
   • CThe PE router will immediately detect the failure of the CE router using BFD.
   • DThe CE routers will keep the BGP session up and continue to advertise routes to the PE router during the restart.
   Reveal Solution Discussion Select an answer first