Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
Answer: B
Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.
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Which layer 1 devices can be used to enlarge the area covered by a single LAN segment?
1.Switch
2.NIC
3.Hub
4.Repeater
5.RJ45 transceiver
Answer: C
Not that you really want to enlarge a single collision domain, but a hub (multiport repeater) will provide this for you.
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Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet?
1.Half-duplex Ethernet operates in a shared collision domain.
2.Half-duplex Ethernet operates in a private collision domain.
3.Half-duplex Ethernet has higher effective throughput.
4.Half-duplex Ethernet has lower effective throughput.
Answer: C
Unlike full duplex, half-duplex Ethernet operates in a shared collision domain, and it has a lower effective throughput than full duplex.
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Which three statements are true about the operation of a full-duplex Ethernet network?
1.There are no collisions in full-duplex mode.
2.A dedicated switch port is required for each full-duplex node.
3.Ethernet hub ports are preconfigured for full-duplex mode.
4.In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.
5.The host network card and the switch port must be capable of operating in full-duplex mode.
Answer: A
Full-duplex means you are using both wire pairs simultaneously to send and receive data. You must have a dedicated switch port for each node, which means you will not have collisions. Both the host network card and the switch port must be capable and set to work in full-duplex mode.
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Which of the following types of connections can use full duplex?
1.Hub to hub
2.Switch to switch
3.Host to host
4.Switch to hub
5.Switch to host
Answer: D
Hubs cannot run full-duplex Ethernet. Full duplex must be used on a point-to-point connection between two devices capable of running full duplex. Switches and hosts can run full duplex between each other, but a hub can never run full duplex.
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How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
1.In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
2.In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
3.You can improve the CSMA/CD network by adding more hubs.
4.After a collision, the station that detected the collision has first priority to resend the lost data.
5.After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
Answer: D
Once transmitting stations on an Ethernet segment hear a collision, they send an extended jam signal to ensure that all stations recognize the collision. After the jamming is complete, each sender waits a predetermined amount of time, plus a random time. After both timers expire, they are free to transmit, but they must make sure the media is clear before transmitting and that they all have equal priority.
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Which of the following are types of flow control?
1.Buffering
2.Cut-through
3.Windowing
4.Congestion avoidance
Answer: B
The common types of flow control are buffering, windowing, and congestion avoidance.
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What is the purpose of flow control?
Answer: C
Flow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow.
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Which of the following describe router functions?
Answer: E
Routers provide packet switching, packet filtering, internetwork communication, and path selection.
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What type of RJ45 UTP cable is used between switches?
Answer: B
To connect two switches together, you would use a RJ45 UTP crossover cable.
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