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Internetworking

1.

Segmentation of a data stream happens at which layer of the OSI model?

Answer: D

The Transport layer receives large data streams from the upper layers and breaks these up into smaller pieces called segments.

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2.

What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?

Answer: D

To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.

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3.

Why does the data communication industry use the layered OSI reference model?

1.It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.

2.It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.

3.It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.

4.It encourages industry standardization by defining what functions occur at each layer of the model.

Answer: B

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;

and it prevents changes in one layer from affecting other layers, so it does not hamper development.

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4.

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?

Answer: D

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.

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Answer: C

The encapsulation method is data, segment, packet, frame, bit.

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6.

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

Answer: A

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.

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7.

How to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?

Answer: D

Fiber-optic cable provides a more secure, long-distance cable that is not susceptible to EMI interference at high speeds.

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8.

What are the decimal and hexadecimal equivalents for the binary number 10110111?

Answer: B

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.

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9.

What are two purposes for segmentation with a bridge?

1.To add more broadcast domains.

2.To create more collision domains.

3.To add more bandwidth for users.

4.To allow more broadcasts for users.

Answer: B

Bridges break up collision domains, which allow more bandwidth for users.

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10.

Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?

Answer: C

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).

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