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Data Communication and Computer Networks MCQ - Data Communication

31 It is desired to send a sequence of computer screen images over an optical fiber. The screen is 480 x 640 pixels, each pixel being 24 bits. There are 60 screen images per second. How much bandwidth is needed, and how many microns of wavelenth are needed for this band at 1.30 microns?

Data rate is 480 x 640 x 24 x 60 bps, which is 442 Mbps.
Assume 1 bps per Hz. ∆ λ = 4.42 x 10⁵
From the relation λ = ∆ λ c
⇒ ∆ λ= λ²/c
∆ λ =4.42 x 10⁵
λ=2.5 x 10⁵ microns

32 Establishing a virtual connection is virtually equivalent to

33 How many digits of the network user Address are known as the DNIC (Data Network Identiication Code) ?

34 How many digits of the DNICC (Data Network Identiication Code) identify the country ?

35 Which of the following digits are known as the area code of the network user address (NUA) ?

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Question:

The monitor station in what standard ensures that one and only one token is circulating ?

A. 802.3
B. 802.5
C. Both (a) and (b)
D. All of these

Correct answer: B

Explanation:

Here 802.3 is Ethernet, it uses CSMA/CD. But 802.5 is Token ring. It will have only one token in circulation. These are IEEE standards but FDDI is ANSI…

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