Computer networks worksheet with answers

Free printable Computer networks worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy

What does LAN stand for?

  1. ALarge access network
  2. BLogical address number
  3. CLocal area network
  4. DLinked application node
2.Easy

Which device forwards packets between different networks based on IP addresses?

  1. AA router
  2. BA hub
  3. CA repeater
  4. DA switch
3.Easy

Which protocol automatically gives devices an IP address on a local network?

  1. ASMTP
  2. BDNS
  3. CFTP
  4. DDHCP
4.Medium

Which of these is a private IPv4 address range?

  1. A100.0.0.0/8
  2. B192.168.0.0/16
  3. C200.1.1.0/24
  4. D8.8.8.0/24
5.Medium

A signal travels 2000 km through fibre at about 2 × 10⁸ m/s. What is the propagation delay?

  1. A10 ms
  2. B1 ms
  3. C0.1 ms
  4. D100 ms
6.Medium

How many usable host addresses does a /24 IPv4 network have?

  1. A254
  2. B255
  3. C256
  4. D252
7.Hard

With sliding-window protocols, how does Go-Back-N differ from Selective Repeat after one frame is lost?

  1. ABoth resend the whole window from the start
  2. BGo-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one
  3. CNeither ever resends lost frames
  4. DGo-Back-N resends only the lost frame; Selective Repeat resends that frame and all later ones
8.Hard

By the Nyquist formula, what is the maximum bit rate of a noiseless 3 kHz channel using 4 signal levels?

  1. A12 kbit/s
  2. B6 kbit/s
  3. C24 kbit/s
  4. D3 kbit/s

Answer key

  1. 1. C · Local area network
  2. 2. A · A router
  3. 3. D · DHCP
  4. 4. B · 192.168.0.0/16
  5. 5. A · 10 ms
  6. 6. A · 254
  7. 7. B · Go-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one
  8. 8. A · 12 kbit/s

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