During the maintenance phase of the CAPWAP tunnel, the TAC and the AP exchange Echo messages (UDP port number is 5246) to detect the connection status of the control tunnel.

Question

Options

• ATrue
• BFalse

• A
  20% (14)
• B
  80% (55)

Explanation

Option B (False) is correct because the statement contains an error regarding the UDP port: CAPWAP Echo Request/Echo Response messages are exchanged over UDP port 5247 (the data channel port), not 5246. UDP port 5246 is reserved for CAPWAP control channel traffic such as discovery, join, and configuration messages, while 5247 carries data-plane traffic and the Echo keepalive mechanism used to detect tunnel connectivity. Option A is incorrect because accepting the statement as true would mean misidentifying the port, which matters operationally - a misconfigured firewall rule blocking 5247 would silently break tunnel detection even while control messages on 5246 continued flowing.

Memory tip: Think of CAPWAP as a two-lane highway - 52-4-6 is the Control lane (C = 6th letter? no - just pair 46 → Control), and 52-4-7 is the Data lane (7 comes after 6, just like Data comes after Control). Echo/keepalive lives in the data lane (5247).

No community discussion yet for this question.