Which of the following description about BGP, OSPF, ISIS is correct?
A . The BGP neighbor relationship is established based on TCP sessions, and the port number used is 179
B. ISIS runs based on the IP protocol, using the protocol number 89
C. BGP runs based on UDP sessions, and the port number used is 179
D. OSPF runs based on the IP protocol, and the protocol number used is 90
Answer: A
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