section 1

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section 1
2010-06-28 19:14:37

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  1. Both switches and hubs are being utilized within the TestKing network. Which ofthe following is true regarding the use of switches and hubs for networkconnectivity in this network?
    A. Switches take less time to process frames than hubs take
    B. Hubs can filter framesC. Switches do not forward broadcasts
    D. Switches increase the number of collision domains in the network
    E. Using hubs can increase the amount of bandwidth available to hosts
    F. None of the above
    • D.
    • Explanation:The biggest benefit of using switches instead of hubs in your internetwork is that eachswitch port is actually its own collision domain. (Conversely, a hub creates one largecollision domain.) But even armed with a switch, you still can't break up broadcastdomains. Neither switches nor bridges will do that. They'll typically simply forward allbroadcasts instead. Switch creates the collision domain per port, so we can say switchincrease the number of collision domains.
  2. Which one of the following characteristics is true regarding the use of hubs andswitches?
    A. Hubs can have their ports be configured with VLANs
    B. Using hubs is costly with regard to bandwidth availability.
    C. Switches can not forward broadcasts.
    D. Switches are more efficient than hubs in processing frames.
    E. Switches increase the number of collision domains in the network.
    • E.
    • Explanation: Switches increases the number of collisions domains in the network.Switches that are configured with VLANs will reduce the size of the collisiondomains by increasing the number of collision domains in a network, but makingthem smaller than that of one big, flat network.
  3. When comparing and contrasting the similarities and differences between bridgesand switches, which of the following are valid statements? Choose all the validanswer choices)
    A. Bridges are faster than switches because they have fewer ports.
    B. A switch is a multiport bridge,
    C. Bridges and switches learn MAC addresses by examining the source MAC address ofeach frame received.
    D. A bridge will forward a broadcast but a switch will not.
    E. Bridges and switches increase the size of a collision domain.
    F. None of the above statements are true.
    • B., C
    • Explanation:Both bridges and switches build the bridge table by listening to incoming frames andexamining the source MAC address in the frame.Switches are multiport bridges that allow you to create multiple broadcast domains. Eachbroadcast domain is like a distinct virtual bridge within a switch.
  4. Which of the following correctly describe the various functions and virtues of arouter? (Select all valid answer choices)
    A. Packet switching
    B. Collision prevention on a LAN segment.
    C. Packet filteringD. Broadcast domain enlargement
    E. Broadcast forwarding
    F. Internetwork communication
    G. None of the above
    • A. , C, F
    • Explanation:The main function of a router is to connect different, separated networks together. Indoing so, switching packets from one network to another is a primary function, alongwith providing for communication between networks. As an additional feature, routersare capable of providing filtering on a network address and application port level, sochoice C is also correct.