Question 1

Question 2What is the role of transmission medium in a computer network?

Accepted Answer

Transmission medium is the physical path through which the message travels from the sender to the receiver. Twisted pair cable, coaxial cable, fibre optic cable and radio waves are some examples of transmission medium.

Question 2

Question 3Write any two advantages of networking.

Accepted Answer

Two advantages of networking are:Reduction in hardware costs — In a network, the hardware devices that are not used very often, like modems, printers, scanners, CD-writers, etc. can be shared. This reduces the cost of the hardware.Efficiency — In a network, the deletion, modification or upgradation of the software/data is to be done at a single point only. This brings more efficiency and effectiveness into the working system.

Question 3

Question 4What is a Coaxial cable? Differentiate between Broadband and Baseband Coaxial cable.

Accepted Answer

A Coaxial cable consists of central copper wire surrounded by insulation and then a shield of braided wire. It is used in transmission of video, communications and audio specially in the cable television industry.Difference between Broadband and Baseband Coaxial cable is that Baseband Coaxial cable supports quick transmission of a single signal at a time and is mainly used for LANs whereas Broadband Coaxial cable transmits multiple signals at the same time and is used for longer distances.

Question 4

Question 5Differentiate between the Bluetooth and Infrared wireless technology.

Accepted Answer

BluetoothInfraredBluetooth uses low power radio waves.Infrared uses infrared waves.Bluetooth has a transmission range of upto 240 metres.Infrared has a transmission range of 5 metres.Bluetooth is not limited to line of sight communication.Infrared works only in direct line of sight.

Question 5

Question 6What is the utility of Domain Name? Explain with the help of an example.

Accepted Answer

Domain name is a unique name given to each website or resource connected to the internet. Domain names are easier to remember than IP addresses since name has strong correlation with the website. For example, to use Google search engine, the domain name is google.co.in and to use Wikipedia, it is wikipedia.org.

Question 6

Question 7What is the role of a Gateway in Computer Networks?

Accepted Answer

A Gateway is a network point that acts as an entrance to another network using different protocols. It is a shared connection between a local area network and a larger system i.e. WAN. It basically works as the messenger agent that takes data from one system, interprets it and transfers it to another system.

Question 7

Question 8Write short notes on each of the following:i. Wi-Fiii. Modemiii. Cluster Area Network

Accepted Answer

Wi-FiWi-Fi stands for Wireless Fidelity. It uses radio waves to create a secure, reliable and fast Wireless Local Area Network (WLAN). The devices require a wireless adapter to connect to the WLAN using WiFi. It is widely used to share an internet connection among the devices connected to the WLAN. Its advantages are:It can be used to connect to Internet anywhere and anytime and is quickly replacing the wired medium.It is relatively cheaper compared to the wired medium.Multiple devices can be connect with WiFi to create a WLAN.Its limitations are:Higher power consumption.Slower speeds than wired medium.Transmission breaks or slows down when there is noise interference.ModemModem stands for Modulation/Demodulation. Modulation is the process of converting digital signals to analog and Demodulation is the process of converting analog signals to digital i.e. reverse of Modulation. Thus, Modem helps in transmitting and receiving data between devices over a transmission medium like telephone lines, co-axial cables, radio waves, etc. Modem are of two types — internal or built-in modems and external modems.Cluster Area NetworkCluster Area Network (CAN) also known as Campus Area Network, is a network comprising a series of small LANs over a small geographical area, such as a college campus, office building, etc. It is generally limited to an area between local area network and metropolitan area network.

Question 8

Question 9Write two points of differences for each of the following:i. Hub and Switchii. Router and Repeater

Accepted Answer

HubSwitchPorts of hub do not have individual addresses assigned to them.Switch is aware of the addresses assigned to each of its ports.Hub sends all data it receives to all the connected ports.Switch sends the incoming data it receives only to the correct port.Performance of Hub is relatively lower than Switch.Performance of Switch is relatively greater than Hub.RouterRepeaterA Router is a communication device that is used to connect two different networks.A Repeater is a communication device that is used to regenerate a signal.Routers help the data packets to travel from source to destination over the best route possible.Repeaters help signals to travel longer distances with the same strength or even at a higher power.

Question 9

Question 1Riya wants to transfer pictures of her recent US trip from her mobile to her computer. Suggest a wireless mode of transmission which she can use for the same.

Accepted Answer

Riya can connect her mobile and computer through Bluetooth wireless networking technology. As the mobile phone can be brought in close range to the computer so the transmission range of Bluetooth is well suited for this setup.

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