Exam 300-410 topic 1 question 515 discussion

Correct anwer is D. https://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/convert/mp_ldp_book/mp_ldp_overview.html Nondirectly Connected MPLS LDP Sessions If the LSR is more than one hop from its neighbor, it is nondirectly connected to its neighbor. For these nondirectly connected neighbors, the LSR sends out a targeted Hello message as a UDP packet, but as a unicast message specifically addressed to that LSR. The nondirectly connected LSR responds to the Hello message and the two routers begin to establish an LDP session. This is called extended discovery.

D seems closest: Extended discovery—LDP sessions between routers not directly connected are supported by LDP extended discovery. A router periodically sends LDP targeted hello messages to a specific address. Targeted hello messages are sent as UDP packets addressed to the LDP discovery port at the specific address. The targeted router decides whether to respond to or ignore the targeted hello message. A targeted router that chooses to respond does so by periodically sending targeted hello messages to the initiating router. The above statement implies they both use extended discovery https://www.juniper.net/documentation/us/en/software/junos/mpls/topics/topic-map/ldp-overview.html#:~:text=Targeted%20hello%20messages%20are%20sent,messages%20to%20the%20initiating%20router.

D is corerct

Answer is D: Question asked about routers not directly connected. When this happens it may utilise the Extended Discovery message https://networkn3rd.wordpress.com/2013/01/25/ldp-extended-discovery/

D is the correct answer https://techhub.hpe.com/eginfolib/networking/docs/routers/vsr1000/cg/5200-3157_mpls_cg/content/478560548.htm#:~:text=Session%20messages%E2%80%94Establish%2C%20maintain%2C,messages%20used%20to%20maintain%20sessions.

Y'all, the answer is D. LDP session, advertisement, and notification messages use TCP for reliability. Discovery messages use UDP for efficiency. https://techhub.hpe.com/eginfolib/networking/docs/switches/5500hi/5998-5332_mpls_cg/content/377737614.htm

Agree its D based on the link Tedmus provided. Think it unreasonable to ask questions about specific MPLS configurations in a Enterprise exam.

The correct answer is: B. session message When a newly installed router initiates the establishment of an LDP (Label Distribution Protocol) session to another MPLS router, the target router responds with a session message. This message type is part of the LDP session establishment process and is exchanged between the routers to establish the necessary parameters for label distribution. Therefore, the correct option is B. session message.

The correct answer is: C. advertisement message In MPLS (Multiprotocol Label Switching), LDP (Label Distribution Protocol) is used to establish label-switched paths (LSPs) and distribute labels between routers. When a newly installed router starts establishing an LDP session with another MPLS router to which it is not directly connected, the target router responds with an LDP advertisement message. This message is part of the label distribution process and is used to exchange information about labels and establish the LSP. So, the correct option is C. advertisement message.