300-440 Question 87
Single answerA network engineer is tasked with configuring BGP on a router to support both IPv4 and IPv6 address families. During the configuration, the engineer mistakenly omits the address-family ipv6 command. What will be the result of this omission?
- A
The router will only support IPv4 address family for BGP.
- B
The router will automatically configure IPv6 address family for BGP.
- C
The router will not establish any BGP neighbor relationships.
- D
The router will display an error and terminate the BGP configuration process.
Show answer and explanation
Correct answer: A
Explanation
In BGP configuration, address families determine the type of network layer protocols (IPv4, IPv6, etc.) that BGP will support. By default, BGP supports the IPv4 address family. To enable IPv6 routing in BGP, the address-family ipv6 command must be explicitly configured. If this command is omitted, BGP will only support the IPv4 address family, and IPv6 networks will not be advertised or learned.
- A. Correct.
This is correct. Without explicitly configuring the
address-family ipv6command, BGP will only support IPv4 address family by default. - B. Incorrect.
This is incorrect. IPv6 address family must be explicitly configured in BGP; it is not automatically enabled.
- C. Incorrect.
This is incorrect. Omission of the
address-family ipv6command only affects IPv6 configuration, not the establishment of BGP neighbor relationships for IPv4. - D. Incorrect.
This is incorrect. The router will not terminate the BGP configuration process because of this omission; it will simply not support IPv6 address family.