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12th Standard English Medium Computer Applications Subject Network Cabling Book Back 3 Mark Questions with Solution

Published on: 05/06/2021

QB365 provides detailed and simple solution for every book back questions in class 12 Computer Applications subject.It will helps to get more idea about question pattern in every book back questions with solution.

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Std: 12th Standard - Computer Applications

chapter: - Book back Questions

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Questions:

Generic 3

5 x 3 = 15

What are the types of Fibre optic cables?

What is meant by null modem cable? Give the examples.

What are the differences between serial and parallel ports?

Write a short note on RJ45 connector.

Write a note on crossover cables.

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Answers Key:

Generic 3

5 x 3 = 15

There are two types of fibre optic cables available.
One is single-mode and another is Multimode.
(i) Single-mode cables are used for long distance transmission and at a high cost.
(ii) Multimode cables are used for short distance transmission at a very low cost.

(i) A cable interconnecting two devices directly is known as a null modem cable.
(ii) The crossover Ethernet cable is an example of the null modem cables.

S.No	Serial Port	Parallel Port
1.	It transmit the data one bit at one time.	It transmit the data 8-bit at one time.
2.	Slower than the parallel port	Fast than a serial port
3.	RS232 is type of serial cable, also known as Null modem cable.	Used to connect the printer and other disk drives.

(i) The RJ45 connector looks similar like a telephone jack but it looks a slightly wider.
(ii) In RJ45 the "RJ" stands for the Registered Jack and the "45" simply refers to the interface standard.
(iii)The RJ45 connector is a small plastic cube. It has eight pins.
(iv) It is connected to each end of the Ethernet cable. It is also known as 8P8C connector.
(v) These plugs (connector) are inserted into Ethernet port of the network card.

(i) If you require a cable to connect two computers or Ethernet devices directly together without a hub, then you will need to use a Crossover cable instead.
(ii) Here, the pairs of Tx and Rx lines are crossed.
(iii) It means pin 1 & 2 of the plug on one end are connected with pin 3 & 6 of the plug on other end, and vice versa (3 & 6 to pin 1 & 2).
(iv) The easiest way to make a crossover cable is to make one end to T568A colour coding and the other end to T568B.