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- Question
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.
- Correct Answer
- To provide a means for the receiver to govern the amount of data sent by the sender.
ExplanationFlow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow. - 1. 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
- 2. 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
- 3. 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
- 4. 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
- 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
- 6. How to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?
Options- A. Thicknet coax
- B. Thinnet coax
- C. Category 5 UTP cable
- D. Fiber-optic cable Discuss
- 7. What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?
Options- A. Straight-through
- B. Crossover cable
- C. Crossover with a CSU/DSU
- D. Rolled Discuss
- 8. Why does the data communication industry use the layered OSI reference model?
- It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
- It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
- It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.
- It encourages industry standardization by defining what functions occur at each layer of the model.
Options- A. 1 only
- B. 1 and 4
- C. 2 and 3
- D. 3 only Discuss
- 9. Segmentation of a data stream happens at which layer of the OSI model?
Options- A. Physical
- B. Data Link
- C. Network
- D. Transport Discuss
- 10. How does a host on an Ethernet LAN know when to transmit after a collision has occurred?
- In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
- In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
- You can improve the CSMA/CD network by adding more hubs.
- After a collision, the station that detected the collision has first priority to resend the lost data.
- 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.
Options- A. 1 and 3
- B. 2 and 4
- C. 1,3 and 4
- D. 2 and 5 Discuss
Internetworking problems
Search Results
Correct Answer: Data, segment, packet, frame, bit
Explanation:
The encapsulation method is data, segment, packet, frame, bit.
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.
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.
Correct Answer: All of the above
Explanation:
Routers provide packet switching, packet filtering, internetwork communication, and path selection.
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.
Correct Answer: Fiber-optic cable
Explanation:
Fiber-optic cable provides a more secure, long-distance cable that is not susceptible to EMI interference at high speeds.
Correct Answer: Rolled
Explanation:
To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.
Correct Answer: 1 and 4
Explanation:
The main advantage of a layered model is that it can allow application developers to change aspects of a program in just one layer of the layer model's specifications.
Advantages of using the OSI layered model include, but are not limited to, the following:
It divides the network communication process into smaller and simpler components, thus aiding compo- nent development, design, and troubleshooting;
it allows multiple-vendor development through standardization of network components;
it encourages industry standardization by defining what functions occur at each layer of the model;
it allows various types of network hardware and software to communicate;
Correct Answer: Transport
Explanation:
The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments.
Correct Answer: 2 and 5
Explanation:
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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