300-410 · Question #29
Which transport layer protocol is used to form LDP sessions?
The correct answer is C. TCP. LDP (Label Distribution Protocol) uses TCP as its transport layer protocol to establish and maintain reliable sessions between MPLS-enabled routers for exchanging label mapping information.
Question
Options
- AUDP
- BSCTP
- CTCP
- DRDP
How the community answered
(15 responses)- A7% (1)
- C87% (13)
- D7% (1)
Why each option
LDP (Label Distribution Protocol) uses TCP as its transport layer protocol to establish and maintain reliable sessions between MPLS-enabled routers for exchanging label mapping information.
UDP (User Datagram Protocol) is a connectionless, unreliable transport protocol and would not provide the necessary guarantees for LDP's label exchange.
SCTP (Stream Control Transmission Protocol) is a reliable transport protocol, but LDP is standardized and implemented to use TCP, not SCTP.
LDP utilizes TCP (Transmission Control Protocol) for establishing sessions and exchanging label mapping messages between peers. TCP ensures reliable, in-order delivery, and error checking for the critical label distribution information, which is essential for the stable operation of an MPLS network.
RDP (Remote Desktop Protocol) is an application layer protocol used for remote graphical access, not a transport layer protocol for LDP.
Concept tested: LDP transport layer protocol (TCP)
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/xe-16/mp-ldp-xe-16-book/mp-ldp-cfg.html
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