COMPUTER COMMUNICATION & NETWORKS ASSIGNMENT ANSWER

This Article shows Qestions and Answer workings on Computer Communication & Networks (CMP 761) Assignment for the Post Graduate Diploma program of Federal Polytechnic Bauchi in Affiliation with Joseph Sarwvan Tarka University, Markurdi.

This questions and answers are deemed helpful to those currently writing their on going exams in the department of Computer Science.

Below are the Questions:

THE FEDERAL POLYTECHNIC, BAUCHI

DIRECTORATE OF UNIVERSITY AFFILIATIONS AND LINKAGES

PGD Computer Science

Assignment

Answer ALL questions

1. 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.

2.a) Define telecommunication processors,

b) Describe the following telecommunication processors:

i. Switch ii. Bridge iii. Router  iv. Gateway  v. Firewall   vi. Multiplexer

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

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

b) Describe the following types of modems:

i. ISDN ii. DSL iii. Cable modem

c) i. What do you understand by intranet?

ii. Discuss any three business value of intranet.

d) i. What do you understand by internet?

ii. Discuss any three business value of internet.

4. a) Draw a well label 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) Itanium processor uses 32-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.

5. a) What do you understand a processor?

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

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

Study the Answers Available!

THE FEDERAL POLYTECHNIC, BAUCHI

DIRECTORATE OF UNIVERSITY AFFILIATIONS AND LINKAGES

PGD Computer Science

Assignment Answer

1. 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 aluminium thick cable wrapped in an insulator and the insulator is put into a covered jacket. Data transmission rate 200mpbs – 500mpbs. The coaxial 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. 

2.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. Switch – Intelligent device that connects devices in a Local Area Network (LAN)

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

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

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

v. 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.

v. Multiplexer – This intelligent device allows multiple slow channels to use single faster channel.

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. 

3. 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).

b) Describing the following types of modems:

i. ISDN (Integrated Services Digital Network) Modem: An ISDN modem is a type of dial-up modem that uses ISDN technology to establish a digital connection over traditional copper phone lines. ISDN modems support data transfer rates of up to 128 Kbps and are often used for remote access to corporate networks or internet connectivity in areas where broadband is not available.

ii. DSL (Digital Subscriber Line) Modem: A DSL modem is a type of broadband modem that uses existing copper phone lines to deliver high-speed internet connectivity. DSL modems support data transfer rates ranging from several hundred Kbps to several Mbps, depending on the specific DSL technology used (e.g., ADSL, SDSL, VDSL). DSL modems are commonly used for home and business internet connections.

iii. Cable Modem: A cable modem is a type of broadband modem that uses the same coaxial cable that delivers television programming to provide high-speed internet connectivity. Cable modems support data transfer rates of up to several hundred Mbps and are commonly used for home internet connections.c) 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 

d) i. Meaning of internet: internet is a global network connecting thousand of other network worldwide. Internet is a public access network and it is open to all.

ii. Discuss any three business value of internet.

1. Communication – eMail, internet telephone, online chatting, zoom meeting
2. Access information from web page
3. Search for information using search engines.

4. a) Draw a well label 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 — 2^32 = 4,294,967,296 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 labelled diagram to illustrate the communication between the components of a 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) State and explain any four types special purpose registers that you know.

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

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

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

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

 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.

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