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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) Questions 297–304 (page: 39)

Updated On: 9-Jul-2026

Router R1 is configured using VRF’s to support customer VPN’s. Some customers are using the same private IP address space. Which of the following is used to ensure that these routes are unique when advertised throughout the VPN?

  1. Route Distinguisher
  2. Route Targets
  3. MP-BGP
  4. LDP

Answer(s): A



Two MPLS routers, R1 and R2, are not directly connected and have an established LDP session running between them. What type of LDP session is this?

  1. Remote LDP session
  2. Direct LDP session
  3. Tunneled LDP session
  4. Targeted LDP session

Answer(s): D



What is the total length of an MPLS header?

  1. 16 bits
  2. 20 bits
  3. 28 bits
  4. 32 bits

Answer(s): D



Which of the following are valid fields in an MPLS header? (Choose four.)

  1. Label
  2. Sequence Number
  3. Experimental (Exp)
  4. Bottom of Stack (BoS)
  5. Time to Live (TTL)
  6. Checksum

Answer(s): A,C,D,E



What TCP port is used by LDP to provide for reliable transport connections?

  1. 646
  2. 648
  3. 752
  4. 712

Answer(s): A



Which of the following are control plane protocols used within a service provider MPLS network? (Choose two.)

  1. OAM
  2. RSVP
  3. Targeted LDP
  4. SNMP
  5. LDP

Answer(s): B,E



In a typical MPLS VPN, which routers act as the MPLS label imposition and disposition points in the network?

  1. CE Router
  2. P router
  3. PE Router
  4. Core router

Answer(s): C



In an MPLS network, which of the following describes the role of the Provider (P) router?

  1. To connect to customer edge (CE) devices
  2. To connect to PE routers and act as transit routers
  3. To impose MPLS labels
  4. To filter VPN routes in the core

Answer(s): B



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