Describe BGP Operations SONIC-DEPLOY Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is the purpose of the BGP OPEN message?

   • ATo establish and negotiate parameters for a BGP session
   • BTo notify peers of an error condition
   • CTo keep the session alive when there is no other traffic
   • DTo exchange routing information between peers
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2. 12application · medium

   A network engineer is configuring BGP on a Dell SONiC switch to advertise a customer's prefix to an upstream provider. The engineer wants to ensure that the customer's prefix is advertised only to that specific provider and not to any other BGP peers. Which configuration approach should be used?

   • AUse an AS-path filter to allow only the customer's AS.
   • BConfigure the customer's prefix as a static route and redistribute it into BGP.
   • CUse a route map to set the community attribute on the prefix and apply it to the neighbor.
   • DUse an outbound prefix list on the neighbor to permit only the customer's prefix.
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4. 13application · medium

   A network engineer is troubleshooting BGP convergence issues on a Dell SONiC switch. The engineer notices that a flapping route is causing BGP updates to be sent repeatedly. Which mechanism can be used to reduce the impact of route flapping on BGP convergence?

   • AEnable route flap damping on the BGP neighbor.
   • BDecrease the BGP update timer.
   • CUse a route map to set a higher local preference on the flapping route.
   • DIncrease the hold timer on the BGP session.
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5. 14expert · hard

   A network engineer is configuring BGP on a Dell SONiC switch that has two eBGP peers, each advertising the same prefix. The engineer wants to prefer the path from Peer A. The engineer has already set a higher local preference on the routes from Peer A. However, the switch still selects the path from Peer B. What is the most likely reason?

   • AThe AS path from Peer B is shorter than the AS path from Peer A.
   • BThe MED from Peer B is lower than the MED from Peer A.
   • CThe local preference is not being applied because the route map is not applied to the neighbor.
   • DThe next hop from Peer B is reachable, while the next hop from Peer A is not.
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6. 15application · medium

   A network engineer is troubleshooting a BGP session between two Dell SONiC switches that will not establish. The engineer verifies that both switches have the correct neighbor IP addresses and that the interfaces are up. The engineer also confirms that the BGP configuration is correct on both sides. Which additional check is most likely to reveal the cause of the session not establishing?

   • ACheck that the hold timer is set to the same value on both switches.
   • BConfirm that the BGP router ID is unique across the entire network.
   • CVerify that TCP port 179 is reachable between the two switches.
   • DEnsure that the neighbor is configured with the same AS number as the local switch.
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