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- Question
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
- Correct Answer
- 1 and 4
ExplanationThe 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;
Internetworking problems
Search Results
- 1. 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
Correct Answer: Rolled
Explanation:
To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.- 2. 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
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.- 3. 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.- 4. 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.- 5. 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.- 6. Segmentation of a data stream happens at which layer of the OSI model?
Options- A. Physical
- B. Data Link
- C. Network
- D. Transport Discuss
Correct Answer: Transport
Explanation:
The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments.- 7. 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
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.- 8. Which fields are contained within an IEEE Ethernet frame header?
- Source and destination MAC address
- Source and destination network address
- Source and destination MAC address and source and destination network address
- FCS field
Options- A. 1 and 4
- B. 2 only
- C. 2 and 3 only
- D. 3 only Discuss
Correct Answer: 1 and 4
Explanation:
An Ethernet frame has source and destination MAC addresses, an Ether-Type field to identify the Network layer protocol, the data, and the FCS field that holds the answer to the CRC.- 9. What are the decimal and hexadecimal equivalents for the binary number 10110111?
Options- A. 69/0x2102
- B. 183/B7
- C. 173/A6
- D. 83/0xC5 Discuss
Correct Answer: 183/B7
Explanation:
You must be able to take a binary number and convert it into both decimal and hexadecimal. To convert to decimal, just add up the 1s using their values. The values that are turned on with the binary number of 10110111 are 128 + 32 + 16 + 4 + 2 + 1 = 183. To get the hexadecimal equivalent, you need to break the eight binary digits into nibbles (4 bits), 1011 and 0111. By add- ing up these values, you get 11 and 7. In hexadecimal, 11 is B, so the answer is 0xB7.- 10. What type of RJ45 UTP cable is used between switches?
Options- A. Straight-through
- B. Crossover cable
- C. Crossover with a CSU/DSU
- D. Crossover with a router in between the two switches Discuss
Correct Answer: Crossover cable
Explanation:
To connect two switches together, you would use a RJ45 UTP crossover cable.
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