CCNA Sample Questions

640-801

46. The following exhibit shows the Braindumps.biz WAN. Study it carefully:
    

    What are the broadcast addresses of the subnets in the Braindumps network? (Select three options).
    A. 172.16.82.255
    B. 172.16.95.255
    C. 172.16.64.255
    D. 172.16.32.255
    E. 172.16.47.255
    F. 172.16.79.255

    Answer :B, E, F

    Explanation:The subnets in the network are subnetted Class B addresses. A /20 subnet mask means that the subnet addresses increment by 16.

    For example: 172.16.16.0, 172.16.32.0, 172.16.48.0, 172.16.64.0 etc. The broadcast address is the last IP address before the next subnet address.
    B: The switch IP address (172.16.82.90) is in the 172.16.80.0 subnet. 172.16.95.255 is the broadcast address for the 172.16.80.0 subnet.
    E: 172.16.47.255 is the broadcast address for the 172.16.32.0 subnet.
    F: 172.16.79.255 is the broadcast address for the 172.16.64.0 subnet.

47. You are a network administrator at Braindumps. The Braindumps network is illustrated in the following exhibit. Study it carefully:
    

    Routers Braindumps1 and Braindumps2 are connected through their social interfaces, however, they cannot communicate. You ascertain that Braindumps1 has the correct configuration.

    Can you identify the fault on router Braindumps2?

    1. Link reliability is insufficient
    2. IPCP is not open
    3. Incorrect subnet mask
    4. Incompatible encapsulation
    5. Bandwidth allocation is too low
    6. Incomplete IP address

    Answer :D

    Explanation :HDLC and PPP Configuration
    HDLC and PPP configuration is straightforward. You just need to be sure to configure the same WAN data-link protocol on each end of the serial link. Otherwise, the routers will misinterpret the incoming frames, because each WAN data-link protocol uses a different frame format. Other than configuring some optional features that are all you need to do.