Internetworking problems
- 1. Which of the following are unique characteristics of half-duplex Ethernet when compared to full-duplex Ethernet?
- Half-duplex Ethernet operates in a shared collision domain.
- Half-duplex Ethernet operates in a private collision domain.
- Half-duplex Ethernet has higher effective throughput.
- Half-duplex Ethernet has lower effective throughput.
Options- A. 2 only
- B. 1,2 and 3
- C. 1 and 4
- D. 4 only Discuss
Correct Answer: 1 and 4
Explanation:
Unlike full duplex, half-duplex Ethernet operates in a shared collision domain, and it has a lower effective throughput than full duplex.
- 2. Which of the following are types of flow control?
- Buffering
- Cut-through
- Windowing
- Congestion avoidance
Options- A. 1 and 2
- B. 1, 3 and 4
- C. 2 only
- D. 3 only Discuss
Correct Answer: 1, 3 and 4
Explanation:
The common types of flow control are buffering, windowing, and congestion avoidance.
- 3. Which three statements are true about the operation of a full-duplex Ethernet network?
- There are no collisions in full-duplex mode.
- A dedicated switch port is required for each full-duplex node.
- Ethernet hub ports are preconfigured for full-duplex mode.
- In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.
- The host network card and the switch port must be capable of operating in full-duplex mode.
Options- A. 1, 2, and 5
- B. 2 and 4
- C. 2, 3 and 4
- D. 5 only Discuss
Correct Answer: 1, 2, and 5
Explanation:
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.
- 4. What are two purposes for segmentation with a bridge?
- To add more broadcast domains.
- To create more collision domains.
- To add more bandwidth for users.
- To allow more broadcasts for users.
Options- A. 1 only
- B. 2 and 3
- C. 2 and 4
- D. 4 only Discuss
Correct Answer: 2 and 3
Explanation:
Bridges break up collision domains, which allow more bandwidth for users.
- 5. Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
Options- A. 3, 3, 1, 7
- B. 3, 2, 1, none
- C. 3, 2, 1, 7
- D. 3, 3, 2, none Discuss
Correct Answer: 3, 2, 1, none
Explanation:
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.
- 6. Which of the following describe router functions?
Options- A. Packet switching
- B. Packet filtering
- C. Internetwork communication
- D. Path selection
- E. All of the above Discuss
Correct Answer: All of the above
Explanation:
Routers provide packet switching, packet filtering, internetwork communication, and path selection.
- 7. A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
Options- A. Send a different source port number.
- B. Restart the virtual circuit.
- C. Decrease the sequence number.
- D. Decrease the window size. Discuss
Correct Answer: Decrease the window size.
Explanation:
A receiving host can control the transmitter by using flow control (TCP uses Windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does not overflow its buffers.
- 8. Which layer 1 devices can be used to enlarge the area covered by a single LAN segment?
- Switch
- NIC
- Hub
- Repeater
- RJ45 transceiver
Options- A. 1 only
- B. 1 and 3
- C. 3 and 4
- D. 5 only Discuss
Correct Answer: 3 and 4
Explanation:
Not that you really want to enlarge a single collision domain, but a hub (multiport repeater) will provide this for you.
- 9. When data is encapsulated, which is the correct order?
Options- A. Data, frame, packet, segment, bit
- B. Segment, data, packet, frame, bit
- C. Data, segment, packet, frame, bit
- D. Data, segment, frame, packet, bit Discuss
Correct Answer: Data, segment, packet, frame, bit
Explanation:
The encapsulation method is data, segment, packet, frame, bit.
- 10. What is the purpose of flow control?
Options- A. To ensure that data is retransmitted if an acknowledgment is not received.
- B. To reassemble segments in the correct order at the destination device.
- C. To provide a means for the receiver to govern the amount of data sent by the sender.
- D. To regulate the size of each segment. Discuss
Correct Answer: To provide a means for the receiver to govern the amount of data sent by the sender.
Explanation:
Flow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow.
Programming
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