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300-510 · Question #67

Refer to the exhibit. Which statement about this configuration is true?

The correct answer is D. Router 1 receives only the best path from neighbor 192.168.1.1. Without any BGP multipath or additional-paths configuration applied to the neighbor relationship with 192.168.1.1, standard BGP behavior applies: BGP selects a single best path using its decision process and installs only that one path. The 'maximum-paths' and…

Unicast Routing

Question

Refer to the exhibit. Which statement about this configuration is true?

Exhibit

300-510 question #67 exhibit

Options

  • ARouter 1 sends and receives multiple best paths from neighbor 192.168.1.1
  • BRouter 1 sends up to two paths to neighbor 192.168.1.1 for all routes
  • CRouter 1 receives up to two paths from neighbor 192.168.1.1 for all routes in the same AS
  • DRouter 1 receives only the best path from neighbor 192.168.1.1

How the community answered

(39 responses)
  • A
    5% (2)
  • C
    3% (1)
  • D
    92% (36)

Explanation

Without any BGP multipath or additional-paths configuration applied to the neighbor relationship with 192.168.1.1, standard BGP behavior applies: BGP selects a single best path using its decision process and installs only that one path. The 'maximum-paths' and 'additional-paths' features must be explicitly configured to allow BGP to send or receive multiple paths. Since neither is shown in the exhibit's configuration, Router 1 receives only the single best path from neighbor 192.168.1.1. Option A requires 'additional-paths send/receive' on both ends; Option B would require 'neighbor ... additional-paths send N'; Option C would require 'neighbor ... additional-paths receive' plus same-AS multipath settings.

Topics

#BGP#Path Selection#Route Advertisement#Default Behavior

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