Computer Networks UGC

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Question 1

In the TCP/IP model, encryption and decryption are functions of ____ layer.
  • Datalink layer
  • Network layer
  • Transport layer
  • Application layer
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Question 2

Consider the Euler’s phi function given by ϕ(n)=nΠp/n(1–1p) where p runs over all the primes dividing n. What is the value of ϕ(45)?
  • 3
  • 12
  • 6
  • 24
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Question 3

What percentage(%) of the IPv4, IP address space do all class C addresses consume?
  • 12.5%
  • 25%
  • 37.5%
  • 50%
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Question 4

Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below.
What is the number of subnets inside the enterprise network?

  • 3

  • 12

  • 6

  • 8

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