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End-to-End DSL Architectures

Chapter Description

Explore the configurations of the four basic TCP/IP architectures for DSL, including three architectures based on RFC 2684, Routed Bridge Encapsulation (RBE), and Point-to-Point Protocol over ATM (PPPoA). You will go through configurations for the Cisco 827 CPE router, the Cisco 6000 series of IP/DSL Switches, and the Cisco 6400 Universal Access Concentrator (UAC).

Review Questions

  1. What does the command ip unnumbered gigabit ethernet 0/0/0 accomplish?
    1. It enables IP on the interface without assigning a specific IP address.
    2. It selects the authentication protocol and an optional secondary protocol.
    3. It associates a virtual template with a virtual template interface.
    4. It specifies a dynamic IP address assignment method, from either an IP address pool or a DHCP server.

  2. Which of the following apply to the NRP?
    1. Layer 3 services
    2. High-speed ATM switch
    3. Central control for the 6400
    4. Traffic shaping

  3. Which of the following apply to the NSP?
    1. Central control of the 6400
    2. Layer 3 packet services
    3. Terminates PPP
    4. End-to-end transport authentication

  4. Which of the following apply to the NLC?
    1. Optical interface
    2. Automatic protection switching
    3. Layer 3 services
    4. Terminates PPP

  5. True or false: The 6400 must be configured with redundant NSP cards.


  6. The IP address for the subscriber's PC can be provided by what? (Select all that apply.)
    1. Static configuration
    2. DHCP server on the ATU-R
    3. DHCP server on the aggregation router
    4. DHCP server on the RADIUS server

  7. The interface designation int atm 0/0/0 on the 6400 designates what?
    1. ATM interface slot 0, subslot 0, card 0
    2. Backplane connection, subslot 0, port 0
    3. ATM interface port 0, subslot 0, slot 0
    4. ATM interface slot 0, port 0, subslot 0

  8. From the NSP, interface designation atm 1/0/0 indicates what?
    1. Interface to the card in port 1, subslot 0, slot 0
    2. Interface to the card in slot 1, subslot 0, card 0
    3. Interface to the card in slot 1, subslot 0, port 0
    4. Interface to the card in slot 1, card 0, port 0

  9. What is the NSP switch default ATM protocol?
    1. LAPD
    2. X.25
    3. UNI 4.0
    4. ISDN

  10. Which of the following best describes a BVI?
    1. It provides the interface between a bridge group and the routed network.
    2. It assembles packets coming from the bridge group into FR frames.
    3. It restricts broadcast messages within a bridge group.
    4. None of the above

  11. Which of the following best describes SONET APS on the 6400 system?
    1. Redundant NLC cards supplying OC-3 traffic to the NSP.
    2. Redundant NLC ports supplying OC-3 traffic to the NRP.
    3. The 6400 system does not support SONET APS.
    4. Redundant NSP configured for failover.

  12. ilmi-pvc-discovery refers to the process of what?
    1. The automatic discovery of configured PVCs on the NRP card
    2. The automatic discovery of configured PVCs on the NLC card by the NRP card
    3. The automatic discovery of configured PVCs on the NSP card by the NRP card
    4. None of the above

  13. When two NRP-1s are configured in a redundant configuration, which of the following occurs?
    1. Both NRP-1s provide redundant traffic to the NSP.
    2. Both NRP-1s provide redundant traffic to the NLC.
    3. Both NRP-1s provide redundant traffic to the NPP.
    4. None of the above

  14. True or false: The function of the encapsulation aal5mux ppp dialer command is to specify the encapsulation type for the PPPoA PVC on the 827.


  15. Which protocol contains information about higher-layer protocols, including IP and IPX, and their control protocols (IPCP for IP)?
    1. NCP
    2. LLC
    3. PCP
    4. NLP