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Internetworking - Networking MCQ Questions and answers | Technical Aptitude

Learn Internetworking mcq questions and answers with easy and logical explanations for various competitive examination, interview and entrance test Page-2 section-1

11
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.
Discuss
Answer & Solution
Answer: Option D
Solution:
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.
12
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
Discuss
Answer & Solution
Answer: Option D
Solution:
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.
13
Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
Discuss
Answer & Solution
Answer: Option C
Solution:
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).
14
Which fields are contained within an IEEE Ethernet frame header?
1. Source and destination MAC address
2. Source and destination network address
3. Source and destination MAC address and source and destination network address
4. FCS field
Discuss
Answer & Solution
Answer: Option A
Solution:
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.
15
What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?
Discuss
Answer & Solution
Answer: Option D
Solution:
To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.
16
How to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?
Discuss
Answer & Solution
Answer: Option D
Solution:
Fiber-optic cable provides a more secure, long-distance cable that is not susceptible to EMI interference at high speeds.
17
Segmentation of a data stream happens at which layer of the OSI model?
Discuss
Answer & Solution
Answer: Option D
Solution:
The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments.
18
When data is encapsulated, which is the correct order?
Discuss
Answer & Solution
Answer: Option C
Solution:
The encapsulation method is data, segment, packet, frame, bit.
19
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.
Discuss
Answer & Solution
Answer: Option C
Solution:
Unlike full duplex, half-duplex Ethernet operates in a shared collision domain, and it has a lower effective throughput than full duplex.
20
What type of RJ45 UTP cable is used between switches?
Discuss
Answer & Solution
Answer: Option B
Solution:
Correct Answer: B) Crossover cable

Here's why:

Imagine two switches are like two people trying to talk.

* Option A: Straight-through cable: Think of this like both people trying to speak at the same time and both listening at the same time. They can't hear each other because their "talking" (transmit) lines are connected to each other and their "listening" (receive) lines are connected to each other. It doesn't work for two switches directly connected.

* Option B: Crossover cable: This cable is specially wired so that one person's "talking" (transmit) goes to the other person's "listening" (receive), and vice-versa. This is exactly what you need when connecting two switches directly!

* Option C: Crossover with a CSU/DSU: A CSU/DSU is a device used for connecting to a WAN (Wide Area Network) link, like a T1 line. It's not needed for connecting two switches locally.

* Option D: Crossover with a router in between the two switches: You wouldn't use a crossover cable *with* a router between the switches. The router acts as an intermediary and handles the signal routing. Routers typically use straight-through cables to connect to switches.

In summary: When you directly connect two switches, they need a crossover cable to make sure the transmit (talking) and receive (listening) lines are properly matched.