CCNA Sample Questions

640-801

41. The exhibit displays the partial contents of an encapsulation header. Which of the following are true of the network traffic represented in this diagram? (Select three)
    
    1. This is traffic from an FTP server.
    2. This is a UDP header.
    3. The last PDU received in this session had a sequence number of 292735.
    4. This is an OSI layer 4 header.
    5. This is traffic from a Telnet client.

    Answer :D, A &C

42. What does the concept route aggregation mean when one talks about using variable subnet masking?
    1. Reclaiming unused space by means of changing the subnet size.
    2. Combining routes to multiple networks into one supernet.
    3. Calculating the available host addresses in the AS.
    4. Deleting unusable addresses through the creation of many subnets.

    Answer :B

43. What OSI layer is FRAME-RELAY mapped to?
    1. Network
    2. Transport
    3. Data Link
    4. Physical

    Answer :C

44. What is the basic characteristic of switches and hubs?
    1. Hubs cannot filter frames.
    2. Using hubs is costly with regard to bandwidth availability.
    3. Switches do and can not forward broadcasts.
    4. Switches are more efficient than hubs in processing frames.
    5. Switches increase the number of collision domains in the network.

    Answer :E

    Explanation:Switches increases the number of collisions domains in the network. Switches that are configured with VLANs will reduce the size of the collision domains by increasing the number of collision domains in a network, but making them smaller than that of one big, flat network.