L2 VPN Fr, ATM, Ethernet, Vpls

22 Questions | Total Attempts: 327

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L2 VPN Fr, ATM, Ethernet, Vpls

By IMS Asia (https://www. Imsasia. Com)


Questions and Answers
  • 1. 
    A 16-port switch running spanning-tree can have a maximum of how many root ports.
    • A. 

      1

    • B. 

      2

    • C. 

      5

    • D. 

      16

  • 2. 
    Which of the following is not a method for differentiating between logical layer-2 connections across a shared physical media?
    • A. 

      Ethernet VLAN's

    • B. 

      ATM VPI/VCI

    • C. 

      TCP/IP Port number

    • D. 

      Frame-relay DLCI

  • 3. 
    Why is the spanning-tree protocol used in a network?
    • A. 

      To prevent routing loops in networks with redundant routed paths

    • B. 

      To segment a network into separate collision domains

    • C. 

      To prevent routing loops in networks with redundant switched paths

    • D. 

      To allow bundling of multiple physical links into one logical connection

  • 4. 
    A disadvantage of spanning-tree is that the path chosen is not necessarily the optimal one.
    • A. 

      True

    • B. 

      False

  • 5. 
    Spanning tree protocol calculates the path cost based on what?
    • A. 

      Bridge Priority

    • B. 

      Link Bandwidth

    • C. 

      Link Utilisation

    • D. 

      Hop Count

  • 6. 
    Multiple VPLS services can be provisioned over the same set of provider MPLS tunnels.
    • A. 

      True

    • B. 

      False

  • 7. 
    Poor performance, collisions and connectivity issues on an ethernet link can often be due to what?
    • A. 

      Misconfigured link speed

    • B. 

      Duplex mismatch

    • C. 

      A loose ethernet cable

    • D. 

      The incorrect VLAN being configured

  • 8. 
    Which of the following will result in a duplex mismatch on an ethernet link?
    • A. 

      Port A configured for 100m, Full Duplex. Port B configured for 10m, Full Duplex

    • B. 

      Port A configured for 100m, Full Duplex. Port B configured for Auto-detect

    • C. 

      Port A configured for Auto-detect, Port B configured for Auto-detect

    • D. 

      Port A configured for 10m, Half-duplex, port B configured for 100m, half-duplex

  • 9. 
    Which of the following Routers would be elected as the root-bridge?
    • A. 

      R1 - Priority 32768, MAC Address 4A:40:AA:08:85:61

    • B. 

      R2 - Priority 16384, MAC Address 4A:40:AA:01:22:38

    • C. 

      R3 - Priority 32768, MAC Address 4A:40:AA:00:15:82

    • D. 

      R4 - Priority 16384, MAC Address 4A:40:AA:35:81:76

  • 10. 
    Which timer affects how often the Spanning Tree Root Bridge will send configuration BPDU's?
    • A. 

      Hold Timer

    • B. 

      STP Timer

    • C. 

      Keepalive Timer

    • D. 

      Hello Timer

  • 11. 
    Which of the following ethernet specifications defines link aggregation?
    • A. 

      802.3z

    • B. 

      802.11a

    • C. 

      802.3ad

    • D. 

      802.3ah

  • 12. 
    What is a key difference between VPLS and L2VPN services?
    • A. 

      VPLS requires the provider supplies the CE equipment, L2VPN's do not

    • B. 

      L2VPN's must use OSPF as their signalling protocol, VPLS uses BGP

    • C. 

      VPLS functions in a point-to-multipoint mode, while L2VPN's function only as point-to-point

    • D. 

      L2VPN's require the use of MPLS in the provider network, while VPLS does not

  • 13. 
    Which of the following operations MUST a PE device support when functioning in a VPLS network? (select the one that is not)
    • A. 

      MAC Learning

    • B. 

      Flooding packets sent to an unknown MAC address.

    • C. 

      Proxy-ARP

    • D. 

      Packet Forwarding

  • 14. 
    You are required to provide fully meshed connectivity between 5 customer sites. How many L2VPN's are required to achieve this?
    • A. 

      1

    • B. 

      5

    • C. 

      10

    • D. 

      20

  • 15. 
    One of the improvements of Rapid Spanning tree is that it not only chooses a valid path between nodes, it also chooses the optimal path?
    • A. 

      True

    • B. 

      False

  • 16. 
    Which of the following statements is false?
    • A. 

      VPLS is a point-to-point service

    • B. 

      VPLS is a bridged service

    • C. 

      VPLS provides VPN connectivity to CE devices

    • D. 

      VPLS will allow for broadcast communication between CE devices

  • 17. 
    Which of the following statements are true?
    • A. 

      Frames should be switched based on destination MAC address

    • B. 

      Frames should be sent only to the PE attached to the destination when possible

    • C. 

      Frames should be flooded as little as possible

    • D. 

      All of the above are true

  • 18. 
    Which of the following are true? (choose two)
    • A. 

      Kompella style L2VPN's use BGP as the signalling protocol

    • B. 

      Kompella style L2VPN's use LDP as the signalling protocol

    • C. 

      Martini style L2VPN's use BGP as the signalling protocol

    • D. 

      Martini style L2VPN's use LDP as the signalling protocol

  • 19. 
    VPLS supports which types of physical connection?
    • A. 

      Ethernet, ATM and Serial connections

    • B. 

      Ethernet and ATM connections only

    • C. 

      Ethernet and Serial connections only

    • D. 

      Ethernet Connections only

  • 20. 
    How many MPLS LSP's are required in each direction between PE1 and PE2 to support 100 VPLS domains across this network?
    • A. 

      1

    • B. 

      100

    • C. 

      200

    • D. 

      9900

  • 21. 
    Which of the following MPLS signaled LSP's will support VPLS transport?
    • A. 

      RSVP Signalled LSP's Only

    • B. 

      LDP Signalled LSP's Only

    • C. 

      Both RSVP and LDP signalled LSP's

    • D. 

      MPLS LSP's are not used for VPLS transport

  • 22. 
    Which priority if configured would be elected as the root bridge?
    • A. 

      R1 - Priority 4096

    • B. 

      R2 - Priority 8192

    • C. 

      R3 - Priority 16384

    • D. 

      R4 - Priority 32768