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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) Questions 305–312 (page: 40)

Updated On: 9-Jul-2026

The MPLS LDP autoconfiguration feature allows you to enable LDP on every interface that is associated with an IGP instance. Which of the following Interior Gateway Protocols support this? (Choose two.)

  1. OSPF
  2. IS-IS
  3. BGP
  4. RIP
  5. EIGRP

Answer(s): A,B



In an MPLS VPN network, how are customer routes controlled and distributed?

  1. Through the use of GRE tunnels
  2. Customer routes are redistributed into the IGP that the service provider is using
  3. Customer routes are redistributed into BGP within the service provider
  4. It is distributed through the use of route targets

Answer(s): D



At which layer of the OSI model is an MPLS label imposed?

  1. Layer 2
  2. Layer 3
  3. Between layers 2 and 3
  4. Between layers 3 and 4

Answer(s): C



Which of the following are valid IPv6 Router Advertisement (RA) Guard modes? (Choose two.)

  1. Guard mode
  2. Host mode
  3. Router mode
  4. Open mode
  5. Closed mode

Answer(s): B,C



Which of the following statements are true regarding the e IPv6 RA Guard feature?

  1. This feature is support on LAG bundles interfaces
  2. This feature is supported on private VLANs
  3. Packets dropped by the IPv6 RA Guard feature cannot be spanned.
  4. This feature offers protection in networks where IPv6 traffic is tunneled.

Answer(s): B



Unicast Reverse Path Forwarding (uRPF) has been configured on a service provider network to protect itself from spoofed based attacks. Which of the following are valid uRPF modes? (Choose two.)

  1. Strict mode
  2. Open mode
  3. Closed mode
  4. Block mode
  5. Loose mode

Answer(s): A,E



Which of the following are commonly used ports when implementing RADIUS based authentication and accounting? (Choose two.)

  1. UDP port 1644 for authentication
  2. UDP port 1812 for authentication
  3. TCP port 1812 for authentication
  4. UDP port 1813 for accounting
  5. TCP port 1813 for accounting
  6. UDP port 1644 for accounting

Answer(s): B,D



Which of the following are valid restrictions when configuring Control Plane Policing (CoPP) on Cisco devices? (Choose two.)

  1. You cannot use the “log” keyword with CoPP on the access list entries
  2. CEF must be disabled
  3. The only match types supported with CoPP is ip precedence, ip dscp, and access-group
  4. Only standard access-lists are supported.

Answer(s): A,C



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