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MPLS INTERVIEW QUESTIONS

MPLS INTERVIEW QUESTIONS

MPLS Interview Questions
  •     Define the term FEC in MPLS.
  •     Why is it necessary to enable CEF before running MPLS.
  •     Two MPLS peers not able to for LDP neighborship. What are probable causes?
  •     Which entity imposes label on the PE if the packet arrives unlabelled on it.
  •     Explain the two types of Label Space. Per Platform and Per Interface.
  •     What is OSPF SHAM-Link. Explain its use.
  •     What is MP-BGP? Can we use normal BGP to run an MPLS VPN?
  •     Can we assign a same RD to two different customers?
  •     Customer is distinguished by an RD or an RT?
  •     In control plane, how MP-BGP advertises the VPNv4 Label to its peers?
  •     What is difference b/w Implicit-null and Explicit Null?
  •     Explain the process of LDP neighborship forming?
  •     Explain the difference b/w Process, Fast-Switching, Optimum-Switching and CEF Switching.
  •     Name few other protocols that can generate and distribute labels besides LDP.
  •     Explain various methods of Inter-AS communication.
  •     What is difference b/w Inter-AS communication and CSC?
  •     What is MPLS LDP Sync?  What is its benefit in MPLS VPN.
  •     Do RD value travel in an MP-BGP update?
  •    What is difference b/w an Aggregate label and Unlabbeled terms?
  •    What is difference b/w Down-bit and Domain-Tag when we use OSPF as CE-PE protocol.
  •   Explain the terms “Allow-as in”, “as-override” with the help of an example.
  •   How can you refrain an RR router to not participate in Data Plane and only be used for Control Plane Communication.
  •   Explain the use of commands “no bgp default ipv4-unicast” and “no bgp default route-target filter”.
  •   Two PE nodes are advertising the vpnv4 routes using an RR but both PE cannot see/learn the remote-routes(advertised by 2nd PE) in their routing table even when they belong to same customer and RT values are correctly exported and imported. Explain the possible causes.

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