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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1.Easy

What is the broadcast address of the network 192.168.1.0/24?

  1. A192.168.1.1
  2. B255.255.255.0
  3. C192.168.1.255
  4. D192.168.1.0
2.Easy

In which network topology is every device connected to one central switch or hub?

  1. AStar
  2. BFull mesh
  3. CRing
  4. DBus
3.Easy

What is a network interface card (NIC)?

  1. AA server that stores web pages
  2. BHardware that connects a computer to a network
  3. CA cable that links two routers
  4. DSoftware that resolves domain names
4.Medium

A browser receives HTTP status code 404. What does it mean?

  1. AThe request succeeded
  2. BThe server had an internal error
  3. CThe client must log in first
  4. DThe requested resource was not found
5.Medium

How does TLS typically use asymmetric and symmetric cryptography?

  1. ASymmetric methods agree keys and authenticate; asymmetric ciphers encrypt all the data
  2. BOnly asymmetric cryptography is used throughout
  3. CAsymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
  4. DOnly symmetric cryptography is used, with a fixed shared password
6.Medium

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

  1. ARadio signals never collide
  2. BWi-Fi only allows one device per network
  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
7.Hard

Why does TCP choose an unpredictable initial sequence number for each connection?

  1. ATo compress the data more efficiently
  2. BTo avoid confusion with old segments and make spoofed segments harder to inject
  3. CTo encrypt the payload of each segment
  4. DTo select the best route to the destination for the segments of that connection
8.Hard

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

  1. A172.31.0.1
  2. B172.32.0.1
  3. C10.255.0.1
  4. D192.168.255.1

Answer key

  1. 1. C · 192.168.1.255
  2. 2. A · Star
  3. 3. B · Hardware that connects a computer to a network
  4. 4. D · The requested resource was not found
  5. 5. C · Asymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
  6. 6. C · A wireless station cannot reliably detect collisions while it is transmitting
  7. 7. B · To avoid confusion with old segments and make spoofed segments harder to inject
  8. 8. B · 172.32.0.1

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