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- Question
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
- Correct Answer
- 2 and 5
ExplanationOnce 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. - 1. Segmentation of a data stream happens at which layer of the OSI model?
Options- A. Physical
- B. Data Link
- C. Network
- D. Transport Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
Options- A. Layer 2
- B. Layer 3
- C. Layer 4
- D. Layer 7 Discuss
- 10. Which of the following types of connections can use full duplex?
- Hub to hub
- Switch to switch
- Host to host
- Switch to hub
- Switch to host
Options- A. 1, 2 and 4
- B. 3 and 4
- C. 3 and 5
- D. 2, 3 and 5 Discuss
Internetworking problems
Search Results
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: 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: Rolled
Explanation:
To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.
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: 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.
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.
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.
Correct Answer: Crossover cable
Explanation:
To connect two switches together, you would use a RJ45 UTP crossover cable.
Correct Answer: Layer 4
Explanation:
A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the Transport layer (layer 4).
Correct Answer: 2, 3 and 5
Explanation:
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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