Suggested Answer:D🗳️
Section: Addressing and Routing Protocols in an Existing Network Explanation
Most likely, RouterA is configured with the neighbor 203.0.113.1 remote-as 64496 command. In this scenario, the output of the show ip bgp neighbors command reports that RouterA's Border Gateway Protocol (BGP) neighbor has an IP address of 203.0.113.1 and is operating within the remote autonomous system number (ASN) of 64496. The syntax of the neighbor remote-as command is neighbor ip address remote-as as-number, where ip address and as-number are the IP address and ASN of the neighbor router. For example, the following command configures a peering relationship with a router that has an IP address of 203.0.113.1 in autonomous system (AS) 64496: router(config-router)#neighbor 203.0.113.1 remote-as 64496 Because BGP does not use a neighbor discovery process like many other routing protocols, it is essential that every peer is manually configured and reachable through Transmission Control Protocol (TCP) port 179. Once a peer has been configured with the neighbor remote-as command, the local BGP speaker will attempt to transmit an OPEN message to the remote peer. If the OPEN message is not blocked by existing firewall rules or other security mechanisms, the remote peer will respond with a KEEPALIVE message and will continue to periodically exchange KEEPALIVE messages with the local peer. A BGP speaker will consider a peer dead if a KEEPALIVE message is not received within a period of time specified by a hold timer. Routing information is then exchanged between peers by using UPDATE messages. UPDATE messages can include advertised routes and withdrawn routes. Withdrawn routes are those that are no longer considered feasible. Statistics regarding the number of BGP messages, such as UPDATE messages, can be viewed in the output of the show ip bgp neighbors command. The output of the show ip bgp neighbors command in this scenario does not indicate that RouterA is operating in AS 64496. Nor does the output indicate that RouterA has been assigned a BGP router ID (RID) of 1.1.1.2. Among other things, the partial command output from the show ip bgp neighbors command indicates that the remote peer has an IP address of 203.0.113.1, an ASN of 64496, a RID of 1.1.1.2, an external BGP (eBGP) session that is an Established state, and a hold time of 180 seconds. Reference: Cisco: Cisco IOS IP Routing: BGP Command Reference: neighbor remote-as Cisco: Cisco IOS IP Routing: BGP Command Reference: show ip bgp neighbors
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