[3 Mark Questions]

Question 13 Marks

What are the differences between wired and wireless communication channels?

Answer

WiredCommunicationChannel	WirelessCommunicationChannel
It is more secure.	More security measures need to be considered for providing security.
It is faster than wireless communication.	It is slower than wired communication.
Technically less difficult to set-up.	Technically more difficult to set-up.
More expensive for longer distances.	For long distances, it is less expensive,
User device cannot be moved.	User device can be moved easily within the wireless range.

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Question 23 Marks

When we connect computers in a network using cables then it is called guided media. What are the various types of guided media available? Explain each.

Answer

Three types of cables are used for connecting computers in a network are as follows:

Twisted Pair Cable It consists of two insulated wires twisted around each other and uses copper as the conducting material.
This property of twisted pair cable provides protection against crosstalk and noise.
Co-axial Cable It contains two conductors, the inner conductor made of solid copper and the outer conductor that serves as a shield against noise. An insulating plastic is placed between the two conductors and this whole set-up is covered with a plastic jacket. For cable TV network co-axial cable is used.
Optical Fibre It consists of thin strands of glass or glass like material, which are capable of carrying light signals from a source at one end to another end.

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Question 33 Marks

Differentiate LAN, MAN and WAN on the basis of following characteristic:

Geographical Area
Example
Distance
Cost
Ownership

Answer

Differences between LAN, MAN and WAN

Basis	LAN	MAN	WAN
GeographicalArea	Generally within a building	Within a city	Across the continents
Distance	Upto 5 km	Upto 160 km	Unlimited
Cost	Lessexpensive	More than LAN but less than WAN	More than MAN
Ownership	Private	Private or Public	Shared across the world
Example	Network within your school	Cable TV network within a city	Internet

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Question 43 Marks

Write down the advantages of networking for an office.

Answer

Various advantages of networking for an office are as follows:

Using network we can store our files in many places or computers for data recovery purpose from a disk crash.
It provides sharing of various resources over the network, within the office.
Since, resources are sharable so they can be accessed on any computer by any employee.
Networking supports the very fast transmission of data from one system to another.
All the application softwares need not be installed on individual system, i.e. they can be centralised and can be accessed by anyone from the central system itself.

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Information Technology [3 Mark Questions]

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