- Option : D
- Explanation :
- Frequency Division Multiplexing is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted.Correct
- Wavelength Division Multiplexing (WDM) is an analog multiplexing Technique to combine optical signals.Correct
- WDM is a Digital Multiplexing Technique IncorrectIt is wavelength-division multiplexing
- TDM is a Digital Multiplexing Technique.Correct So, option (D) is correct.

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- Option : B
- Explanation : Throughput(S) in pure aloha is G * e
^{-2G}: It is maximum when G = 1 / 2. i.e. S = 1 / 2 * (2.71)^{-2 * 1 / 2 }=1 / 2 * (2.71)^{-1}= 0.184. So, option (B) is correct.

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- Option : B
- Explanation :

100 pages , each page contain 24 line, each line have 80 character and each character weighted 8 bit, we have to download 100 pages per minute. i.e. 100 * 24 * 80 * 8 / 60 = 25.6 kbps. So, option (D) is correct.

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3 | 5 | 2 | 1 | 4 | (Cipher text) |

1 | 2 | 3 | 4 | 5 | (Plain text) |

- Option : A
- Explanation :

According to given question and key , Z is a bogus character Encrypted message will be:Plain textE X T R A N E T Z Z 1 2 3 4 5 1 2 3 4 5

Cipher textT A X E R T Z E N Z 1 2 3 4 5 1 2 3 4 5

So, option (A) is correct.

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