COMPUTER COMMUNICATION AND NETWORKS – 2022/2023 PGD PAST QUESTIONS & ANSWERS

This Article contains Past question and Answer workings for the Post Graduate Diploma program of Federal Polytechnic Bauchi in Affiliation with Joseph Sarwvan Tarka University, Markurdi.

This Past Question is for the year 2022/2023 Academic Session, and it’s helpful for those currently writing their on going exams in the department of Computer Science.

N.B – These questions and answers are uploaded only as a guide and ease for your studies.

Below are the Questions:

THE FEDERAL POLYTECHNIC, BAUCHI

DIRECTORATE OF UNIVERSITY AFFILIATIONS AND LINKAGES

IN AFFILIATION

WITH JOSEPH SARWUAN TARKA UNIVERSITY MAKURDI

END OF FIRST SEMESTER EXAMINATION 2022/2023 ACADEMIC SESSION

PROGRAMME: PGD Computer Science

COLLEGE: College of Physical Sciences

DEPARTMENT: Computer Science

COURSE TITLE: Computer Communication & Networks

COURSE CODE: CMP 761

INSTRUCTION   Answer any FIVE questions

TIME                    2 ½ Hour

MAXIMUM EXAM MARKS: 70%

QUESTION 1

1. a) Define telecommunication processors.

b) Describe the following telecommunication processors:

i. Bridge

ii. Router

iii. Firewall

iv. Gateway

c) Explain the two ways in which multiplexer allows a single channel to carry simultaneous data transmission from many terminals.

QUESTION 2

2. a) What do you understand by a modem?

i. What do you understand by intranet?

ii. Discuss any three business value of intranet.

QUESTION 3

3. a) Define communication protocols.

b) State the seven layers OSI reference model.

c) Describe the first four layers of OSI reference model.

QUESTION 4

4. a) Draw a well labelled diagram to illustrate the internal communication between the important components of a computer system.

b) With the aid of your diagram above, describe the three types of a bus system.

c) ltanium processor uses 64-bit address line. Required:

(i) Determine the size of the physical memory.

(ii) State the first and the last address (in hexadecimal) of the memory locations.

QUESTION 5

5. a) What do you understand a processor?

b) i. Draw a labelled diagram to illustrate the communication between the components oft processor.

ii. With the aid of your diagram in 2b i. above, describe how the processor subtract two bits.

c) State and explain any four types special purpose registers that you know.

QUESTION 6

6. a) i. What do you understand by extranet network?

ii. Discuss any two business value of extranet network.

b) Distinguish between the following pairs of terms:

i. downloading and uploading.

ii. downlinking and uplinking

QUESTION 7

7. a) What do you understand by telecommunication media?

b) State and explain any two of wired media connections that you know.

c) State and explain any two of wireless media connections that you know.

Good luck!

Study the Answers Available!

1. a) Definition of Telecommunication Processors — These are devices in the network that provides support services in a network.

b) Describing the following telecommunication processors:

i. Bridge — networking devices that connects two similar networks.

ii. Router — networking devices that connects network of different types.

iii. Firewall — Devices that uses set criteria to filter incoming and outgoing request. It permits request that meets the criteria and terminate / kills request that violates the set criteria.

iv. Gateway — Devices that connects networks using different architecture.

c) Explaining the two types of Multiplexer

i. Frequency Division Multiplexer (FDM) — in Frequency Division Multiplexer, the faster channel is divided to use different frequencies. Each frequency is assigned to a slow channel.

ii. Time Division Multiplexer — in Time Division Multiplexer, each of the slow channels is allowed to use the single faster channel for slice of time.

2. a) Meaning of modem: A modem also known as (Modulator and Demodulator) is used for signal conversion. The data from the computer is converted to form suitable for the carrier (channel) to transmit (the process is called modulation). At the destination, another modem converts the data from the carrier (channel) to form computer can use (this process is called Demodulation).

i. Meaning of  intranet — it is a private organizational network that uses the same technologies as that of internet (the network is accessed by browser, users multimedia web pages, databases etc). Accessibility to the network is restricted to organizational employees only. Outsiders and not allowed to assess the network.

ii. Discuss any three business value of intranet.

• Communication

• E-Publication: Reports, news bulletin, training manual, form request.

• Collaboration: To work in a team

• Reduce cost of Operation

3. a) Definition of communication protocols.

Communication protocols refer to the standardized rules, procedures, and formats that govern the exchange of information between devices, systems, or individuals. These protocols ensure that data is transmitted, received, and understood correctly, efficiently, and securely.

b) The seven layers OSI reference model.

i. Physical Layer (Layer 1)

ii. Data Link Layer (Layer 2)

iii. Network Layer (Layer 3)

iv. Transport Layer (Layer 4)

v. Session Layer (Layer 5)

vi. Presentation Layer (Layer 6)

vii. Application Layer (Layer 7)

c) Description of the first four layers of OSI reference model

i. Physical Layer (Layer 1): Defines the physical means of transmitting data (e.g., electrical signals, light waves). It specifies the physical characteristics of the network (e.g., cable specifications, wireless frequencies) and it is responsible for transmitting raw bits over a physical medium

ii. Data Link Layer (Layer 2): Provides error-free transfer of data frames between nodes on the same network and Performs framing, error detection and correction, and flow control.

iii. Network Layer (Layer 3): Routes data between nodes on different networks, Provides logical addressing (e.g., IP addresses) and routing. It also ensures that data is delivered to the correct destination network.

iv. Transport Layer (Layer 4): Provides reliable data transfer between devices. It also ensures that data is delivered in the correct order and without errors or duplication.

4. a) Draw a well labelled diagram to illustrate the internal communication between the important components of a computer system.

b) With the aid of your diagram above, describe the three types of a bus system.

i. Address bus: is used to hold the address of memory location all devices being reference. The size of the address bus determines the number of location and devices that can reference.

ii. It is used for a data movement between the three component of the system. The size of the data bus is always twice the size of the address bus. i.e if 32 bit address –> The size of the bus = 2 x 32 = 64bits

iii. Control signal bus: it holds control signal that determine the operations to be performed.

c) ltanium processor uses 64-bit address line. Required:

(i) The size of the physical memory — 2^64 = 18,446,744,073,709,551,616 bytes

(ii) The first and the last address (in hexadecimal) of the memory locations — Start address = 0000 0000 0000 0000⁴

Last address = FFFF FFFF FFFF FFFF⁴

5. a) A processor — The processor also known as the Central Processing Unit (CPU)

— it is the most important hardware of the computer.

— it execute program, it carries out the operation specified in instruction

— the “heart” of the computer

— it carries arithmetic and logic operations

b) i. Draw a labeled diagram to illustrate the communication between the components of the processor.

ii. With the aid of your diagram in 2b i. above, describe how the processor subtract two bits.

– The processor retrieves the left or parents and place it in the bus A
– The processor receive the right of parent and place it to bus B
– The cu generate subtraction operation signal and pass it to the ALU
– The alu performs the operation and place the result in bus C which can go to any register or to the external bus.

c) Four (4) types special purpose registers.

i. Instruction Register (IR): instruction register it holds the address of the curve instruction being executed by the processor. 

ii. Memory address register (MAR): it holds the address of memory location all device to be reference in the processor. It links to address bus.

iii. Memory data register (MDR): it holds data to be placed in data bus.

iv. Program Counter (PC): it contains the address of the next instruction to be executed.

6. a) i. Definition of extranet network: is a private organizational link that connects two or more intranets. Accessibility to the network is restricted to the organizational employees and certain outsider – customers suppliers, bank etc.

ii. Discuss any two business value of extranet network.

• Metropolitan Area Network

• Virtual Private Network

b) Distinguish between the following pairs of terms:

i. Downloading and Uploading:

– Downloading: Transferring data or files from a remote system or server to a local device or computer. The data is being pulled from the server to the local device.

– Uploading: Transferring data or files from a local device or computer to a remote system or server. The data is being pushed from the local device to the server.

ii. downlinking and uplinking

– Downlinking: Refers to the transmission of data or signals from a satellite or a remote system to a ground station or a local receiver. The data is being sent from the satellite to the ground station.

– Uplinking: Refers to the transmission of data or signals from a ground station or a local transmitter to a satellite or a remote system. The data is being sent from the ground station to the satellite. 

7. a) meaning of telecommunication media: Telecommunication media refers to the channels or mediums through which information is transmitted from one location to another. These mediums enable the communication of voice, data, video, and other forms of information over long distances.

b) Explain any two (2) wired media connections.

    – Twisted pair cables: use ordinary telephone cables to connect devices period the wires are paired and twisted to reduce magnetic effect. It carries voice and data and it’s transmission speed is 2.10 mbps

    – Coaxial cables: it consists of copper or aluminum thick cable wrapped in an insulator and the insulator is put into a covered jacket. Data transmission rate 200mpbs – 500mpbs. The colasia cables are put on the ground or at the floor of ocean.

    – Fiber optic cables: it is uses cable that consists of filaments of glasses wrapped in projective jacket. It transmits light, transmission rate is up to Tbps. It is better than the other two in terms of speed and it is not affected by magnetic field.

c) Explain any two (2) examples of wireless media connections.

– Microwave: connect the two relay station using high frequency radio wave.

– Communication Satellite: connect satellite with grand base station using high frequency radio wave. 

– Cellular system: this is used by mobile operators. It uses low frequency radio wave to broadcast to an area called cell. Service degraded as we move away from the cell.

– Wireless Fidelity (Wi-fi): uses free low frequency radio wave to connect devices. Wi-Fi can be used for LAN. You can find in airport schools etc

– Bluetooth: it is used to connect devices and to do away with physical cables.

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