H12-821_V1.0 · Question #908
Similar to OSPF, the two routers establishing a BGP peer relationship must be directly connected.
The correct answer is B. FALSE. B is correct because BGP (Border Gateway Protocol) does not require directly connected peers - it uses TCP port 179 to establish sessions, meaning two BGP speakers can be separated by multiple hops (this is called eBGP multihop or iBGP). OSPF, by contrast, uses link-state…
Question
Options
- ATRUE
- BFALSE
- C
- D
How the community answered
(42 responses)- A10% (4)
- B71% (30)
- C14% (6)
- D5% (2)
Explanation
B is correct because BGP (Border Gateway Protocol) does not require directly connected peers - it uses TCP port 179 to establish sessions, meaning two BGP speakers can be separated by multiple hops (this is called eBGP multihop or iBGP). OSPF, by contrast, uses link-state flooding and forms adjacencies only with directly connected neighbors using multicast.
A (TRUE) is wrong because this conflates OSPF's adjacency requirement with BGP's behavior. BGP was specifically designed to work across the internet between autonomous systems, making direct connectivity impractical and unnecessary.
Memory tip: Think of BGP as a "long-distance phone call" - it dials up a TCP connection to wherever the peer lives, no matter how far away. OSPF is more like shouting across the room - it only talks to neighbors it can directly hear.
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