Câu 19: 4A0-103: Alcatel-Lucent Multiprotocol Label Switching

Which of the following about an established LDP session is TRUE?

1. A. It uses a UDP connection with an arbitrary port number.
2. B. It uses a UDP connection with well-known port number 646.
3. C. It uses a TCP connection with an arbitrary port number.
4. D. It uses a TCP connection with well-known port number 646. — đáp án hiện tại