True or False: The router bgp command alone activates BGP on a router.

• A. True
• B. False, you must enter one subcommand under the command to activate the process on the router
• C. False, BGP is activated by default
• D. False, it activates BGP only on IPv6

Answer: (B)

Entering the BGP configuration for an ASN sets up the BGP process, but it does not actually establish peering or advertise routes by itself. You must configure at least one subcommand under that command—such as defining a neighbor with its remote AS or advertising a network—so the BGP sessions can form and routes can be exchanged. Without those subcommands, the BGP process remains idle and won’t participate in routing. So the statement is false: you need additional configuration under the BGP command to activate real BGP activity. (For IPv6, you’d use the appropriate address-family and neighbor commands, but the need for subcommands to activate remains.)