Suggested Answer:B🗳️
Section: Addressing and Routing Protocols in an Existing Network Explanation
Enhanced Interior Gateway Routing Protocol (EIGRP) requires a router that operates in the same autonomous system (AS) in order to establish a neighbor relationship, which is also known as an EIGRP adjacency. EIGRP routers establish adjacencies by sending Hello packets to the multicast address 224.0.0.10. EIGRP for IP version 6 (IPv6) routers can use IPv6 link-local addresses to reach neighbors. Hello packets verify that two-way communication exists between routers. As soon as a router receives an EIGRP Hello packet, the router will attempt to establish an adjacency with the router that sent the packet. Unlike OSPF, EIGRP does not go through neighbor states? a neighbor relationship is established upon receipt of an EIGRP Hello packet. An EIGRP router can form an adjacency with another router only if the following values match: ✑ AS number ✑ K values, which are used to configure the EIGRP metric ✑ Authentication parameters, if configured In addition, if the routers are using IP, the primary IP addresses for the routers' connected interfaces must be on the same IP subnet. Border Gateway Protocol (BGP) does not require a router that operates in the same AS in order to establish a neighbor relationship. Because BGP does not use a neighbor discovery process like many other routing protocols, every peer is manually configured and must be 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 UPDATE messages can include advertised routes and withdrawn routes. Withdrawn routes are those that are no longer considered feasible.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. Hot Standby Router Protocol (HSRP) is a First Hop Redundancy Protocol (FHRP), not a routing protocol. Therefore, an HSRP router does not establish a neighbor relationship with another HSRP router. The active and standby routers in an HSRP configuration do send Hello packets to establish roles and determine availability. Typically, HSRP routers are connected together on the same LAN and are therefore operating in the same AS. Static routes are manually configured on individual routers and remain in the routing table even if the path is not valid. Therefore, static routes do not establish neighbor relationships with other routers. A static route can exist regardless of the AS in which the routers are operating. Reference: Cisco: Cisco IOS IP Configuration Guide, Release 12.2: Configuring EIGRP
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