MPLS Terminology JN0-364 Practice Questions (Page 4)

Questions 16–19

1. 16foundation · easy

   What is the purpose of the TTL field in an MPLS label?

   • ATo signal the egress LER to remove the label
   • BTo prevent packets from looping indefinitely in the MPLS network
   • CTo indicate the priority of the packet for QoS purposes
   • DTo identify the FEC that the packet belongs to
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   In MPLS terminology, what is the role of an LER (Label Edge Router)?

   • AA router that only performs label pop operations on packets leaving the MPLS network
   • BA router that only performs label swapping in the core of the MPLS network
   • CA router that only forwards packets based on the destination IP address in the packet header
   • DA router that pushes a label onto an incoming IP packet and later removes the label before forwarding the packet to its destination
   Reveal Solution Discussion Select an answer first
4. 18application · easy

   A packet travels through an MPLS network. At the ingress LER, a label is pushed onto the packet. In the core, an LSR receives the packet and replaces the incoming label with a new outgoing label. What label operation did the core LSR perform?

   • APop
   • BSwap
   • CPHP (Penultimate Hop Popping)
   • DPush
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the primary advantage of MPLS forwarding over traditional IP forwarding?

   • AIt eliminates the need for routing protocols
   • BIt always uses the shortest path to the destination
   • CIt requires a full mesh of tunnels between all routers
   • DIt allows forwarding decisions to be made without examining the IP header
   Reveal Solution Discussion Select an answer first