Exam 350-501 topic 1 question 53 discussion

BE is correct. Between the choices we have been given, we should make sure that the peers are directly connected. If they are not and also they are not configured for targeted ldp (which we don't know) then NSF will not work. BGP NSF doesn't solve the problem.

Correct answers are A & E https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-17/mp-ha-xe-17-book/nsf-sso-mpls-ldp-and-ldp-graceful-restart.html#GUID-AC155BA7-D412-4D1E-9FF5-9346A553BB11

B and E are correct

As someone mentioned here, NSF works for directly connected and not directly connected peers, therefore B cannot be correct. The problem here is in the interpretation of the answers but here we can interpret A as "Enable NSF to use it with BGP".

As per my experience, implement direct connections for LDP peers and enable NSF for the link state routing protocol that is in use on the network. These two tasks perform when anyone implement LDP NSF on your network?

Requirements for LDP NSF: LDP Support | NSF Capability | LDP Synchronization | Router and Network Compatibility | Graceful Restart Configuration | LDP Session Parameters | Routing Protocol Support By meeting these requirements, you can ensure that your MPLS network remains stable and continues to forward packets smoothly during router restarts or failovers.

A pergunta não tem nenhuma relação com BGP.

Its B And E LDP NSF works with LDP sessions between directly connected peers and with peers that are not directly connected https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-3s/mp-ha-xe-3s-book/mp-ldp-grace-nsfsso.html

The answers correct are A and E!

i think A E

I do see AE as correct. Again just repeating what people said before. A you do have to enable NSF for BGP. cant be B because it works for connected and non-connected peers.

I'd vote for 'A' and 'E'

B, C and D aren't correct. You must enable nonstop forwarding on the routing protocols running between the provider (P) routers, provider edge (PE) routers, and customer edge (CE) routers. The routing protocols are: -Border Gateway Protocol (BGP) -Open Shortest Path First (OSPF) -Intermediate System-to-Intermediate System (IS-IS) As it is mentioned, you must enable nonstop forwarding (NSF) on the routing protocols running between the provider (P) routers, provider edge (PE) routers, and customer edge (CE) routers. The requirement is enable NSF for the ROUTING PROTOCOLS IN USE, BGP isn't LS routing protocol, but can be used makes me unsure about D. However, if not B, C and D, we have A and E (A for BGP and E for LS Routing Protocols) are correct (if it is not IELTS like language test, Cisco uses new testing methods :) )

Option A seems to be correct. Prerequisites for NSF SSO--MPLS LDP and LDP Graceful Restart ... Border Gateway Protocol (BGP) Open Shortest Path First (OSPF) Intermediate System-to-Intermediate System (IS-IS) https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-3s/mp-ha-xe-3s-book/mp-ldp-grace-nsfsso.html

Yes E is correct. My guess is that A is also correct because B,C and D are not.

E is the correct answer. From Cisco: "You must enable nonstop forwarding on the routing protocols running between the provider (P) routers, provider edge (PE) routers, and customer edge (CE) routers. The routing protocols are: Border Gateway Protocol (BGP) Open Shortest Path First (OSPF) Intermediate System-to-Intermediate System (IS-IS)"

LDP NSF works with LDP sessions between directly connected peers and with peers that are not directly connected (targeted sessions). from https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-3s/mp-ha-xe-3s-book/mp-ldp-grace-nsfsso.html So that would mean answer B is wrong. Not sure about the targeted sessions component.