Q9. Which of the following statements is true with respect BGP?
A. Any two routers that have been connected and supposed to make TCP connection in order to exchange BGP routing information are called peers, or neighbors.
B. Any two physically adjacent routers are called peers, or neighbors.
C. Any two routers that have formed a TCP connection in order to exchange BGP routing information are called peers, or neighbors.
D. Any routers belonging to the same AS are called peers, or neighbors.
Correct Answer: C
Explanation:
Any two routers that have formed a TCP connection in order to exchange BGP routing information are called peers, or neighbors. BGP peers initially exchange their full BGP routing tables. After this exchange, incremental updates are sent as the routing table changes. BGP keeps a version number of the BGP table, which should be the same for all of its BGP peers. The version number changes whenever BGP updates the table due to routing information changes. Keep alive packets are sent to ensure that the connection is alive between the BGP peers and notification packets are sent in response to errors or special conditions.
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