MPLS - Difficult Concepts QUESTIONS AND ANSWERS 100%ACCURATE.
Exhaustively List out All of the Objects RSVP Uses - ✅✅Record Route Object
Fast Reroute Object
Detour Object
Explicit Route Object
Session Attribute Object
What is the high-level purpose of each of the Session Attribute Object - ✅✅It stores whether
the node is link protection or node protection
The way to think about it is that each router has a session and this session stores very little, just a
Boolean
What are the 3 objectives of the fast-reroute object - ✅✅3 Tasks:
1) Signal LSP
2) Track whether it is one-to-one or facility
3) Indicate desire to establish FRR paths
The way you can think about it is: fast reroute stores whether it wants reroute and which version
of reroute it desires
What are the objectives of the Record Route Object? - ✅✅The Record Route Object is
included in all RSVP Path and RESV messages by default
What is the purpose of a Detour Object - ✅✅Inform the downstream routers of the path over
which it chooses to signal the detour tunnel;
The way to remember this is that the detour object signals the detours
Which object is only used with one-to-one? - ✅✅Detour Object
What is the purpose of the Explicit Route Object? - ✅✅Ensures that the CSPF traverses the
correct, desired hops
List 2 Service Label Signaling Protocols - ✅✅T-LDP
MP-BPG
What does the Penultimate Router Do to the Label when it receives explicit null request -
✅✅Sets Label Header to 0, indicating the eLER shouldn't process the data and only pop the
header
List out the label values of MPLS Special Use Labels - ✅✅0 - IPv4 Explicit Null
1 - Router Alert
Exhaustively List out All of the Objects RSVP Uses - ✅✅Record Route Object
Fast Reroute Object
Detour Object
Explicit Route Object
Session Attribute Object
What is the high-level purpose of each of the Session Attribute Object - ✅✅It stores whether
the node is link protection or node protection
The way to think about it is that each router has a session and this session stores very little, just a
Boolean
What are the 3 objectives of the fast-reroute object - ✅✅3 Tasks:
1) Signal LSP
2) Track whether it is one-to-one or facility
3) Indicate desire to establish FRR paths
The way you can think about it is: fast reroute stores whether it wants reroute and which version
of reroute it desires
What are the objectives of the Record Route Object? - ✅✅The Record Route Object is
included in all RSVP Path and RESV messages by default
What is the purpose of a Detour Object - ✅✅Inform the downstream routers of the path over
which it chooses to signal the detour tunnel;
The way to remember this is that the detour object signals the detours
Which object is only used with one-to-one? - ✅✅Detour Object
What is the purpose of the Explicit Route Object? - ✅✅Ensures that the CSPF traverses the
correct, desired hops
List 2 Service Label Signaling Protocols - ✅✅T-LDP
MP-BPG
What does the Penultimate Router Do to the Label when it receives explicit null request -
✅✅Sets Label Header to 0, indicating the eLER shouldn't process the data and only pop the
header
List out the label values of MPLS Special Use Labels - ✅✅0 - IPv4 Explicit Null
1 - Router Alert
