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 "latency" mean in networking?

  1. AThe maximum amount of data per second that a link can carry
  2. BThe delay for data to travel from source to destination
  3. CThe error rate of a cable
  4. DThe number of devices on a network
2.Easy

How many layers does the OSI reference model have?

  1. A5
  2. B9
  3. C4
  4. D7
3.Easy

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

  1. ASession layer
  2. BNetwork layer
  3. CPhysical layer
  4. DData link layer
4.Medium

What is the network address of the host 192.168.10.77/26?

  1. A192.168.10.0
  2. B192.168.10.64
  3. C192.168.10.128
  4. D192.168.10.76
5.Medium

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

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

Which protocol does the "ping" command use?

  1. ATCP
  2. BUDP
  3. CICMP
  4. DHTTP
7.Hard

Which mechanism prevents broadcast loops in a network with redundant switch links?

  1. ADHCP snooping
  2. BARP caching
  3. CSpanning Tree Protocol
  4. DNAT
8.Hard

Stations A and C both reach access point B but cannot hear each other, so their frames collide at B. How does 802.11 help?

  1. ABy increasing the TTL of the frames
  2. BOptional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait
  3. CBy routing A's frames through C
  4. DBy making A and C use collision detection so they stop sending when frames overlap

Answer key

  1. 1. B · The delay for data to travel from source to destination
  2. 2. D · 7
  3. 3. C · Physical layer
  4. 4. B · 192.168.10.64
  5. 5. B · A wireless station cannot reliably detect collisions while it is transmitting
  6. 6. C · ICMP
  7. 7. C · Spanning Tree Protocol
  8. 8. B · Optional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait

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