Refer to the exhibit. Which statement describes the result of this BGP configuration?

Question

Exhibit

Options

• AR1 operates using IPv4 and VPNv4 address families.
• BR1 operates on IPv6 only because the bgp default ipv4-unicast command is missing.
• CR1 establishes a VPNv4 eBGP relationship with neighbor 192.168.1.1.
• DR1 establishes an iBGP relationship with peer 192.168.1.1.

• A
  5% (1)
• B
  5% (1)
• D
  90% (19)

Explanation

Option D is correct because the exhibit's BGP configuration shows neighbor 192.168.1.1 remote-as set to the same AS number as R1 itself, which by definition creates an iBGP (internal BGP) peering session - both routers share the same Autonomous System.

Why the distractors are wrong:

• A is wrong because operating with VPNv4 requires an explicit address-family vpnv4 block; the exhibit shows no such configuration.
• B is wrong because Cisco IOS enables bgp default ipv4-unicast by default - its absence from the config doesn't disable IPv4 or force IPv6-only operation.
• C is wrong on two counts: eBGP requires different AS numbers between peers, and VPNv4 requires explicit address-family activation - neither condition is met here.

Memory tip: Think of the "i" in iBGP as "internal" - if the remote-as number matches your own router's AS, you're staying internal = iBGP. Different AS = external = eBGP. On exam questions, always check whether the remote-as value matches the router bgp AS number first.

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