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

Which type of network covers a large geographic area, such as a whole country?

  1. AA wide area network (WAN)
  2. BA personal area network (PAN)
  3. CA virtual LAN (VLAN)
  4. DA local area network (LAN)
2.Easy

Which OSI layer transmits raw bits as electrical, optical or radio signals?

  1. APhysical layer
  2. BData link layer
  3. CSession layer
  4. DNetwork layer
3.Easy

What is the default port number for DNS?

  1. A67
  2. B161
  3. C80
  4. D53
4.Medium

Which IPv4 header field stops packets from circulating forever in a routing loop?

  1. AIdentification
  2. BTime to live (TTL)
  3. CHeader checksum
  4. DType of service
5.Medium

Why does Wi-Fi use collision avoidance (CSMA/CA) instead of collision detection?

  1. AWi-Fi only allows one device per network
  2. BRadio signals never collide
  3. CA wireless station cannot reliably detect collisions while it is transmitting
  4. DCollision detection only works on fibre cables, not on shared wireless radio channels
6.Medium

What is the IPv6 loopback address?

  1. A::
  2. Bff02::1
  3. Cfe80::1
  4. D::1
7.Hard

A server's private key is stolen a year from now. Which TLS property keeps today's recorded sessions safe?

  1. AForward secrecy from ephemeral Diffie-Hellman key exchange
  2. BUsing a longer domain name
  3. CSending the certificate twice
  4. DCompressing the data before encryption
8.Hard

Which of these addresses is a public (not RFC 1918 private) IPv4 address?

  1. A172.31.0.1
  2. B192.168.255.1
  3. C10.255.0.1
  4. D172.32.0.1

Answer key

  1. 1. A · A wide area network (WAN)
  2. 2. A · Physical layer
  3. 3. D · 53
  4. 4. B · Time to live (TTL)
  5. 5. C · A wireless station cannot reliably detect collisions while it is transmitting
  6. 6. D · ::1
  7. 7. A · Forward secrecy from ephemeral Diffie-Hellman key exchange
  8. 8. D · 172.32.0.1

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