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

What is the default port number for SSH?

  1. A22
  2. B110
  3. C23
  4. D53
3.Easy

How many bits does an IPv4 address have?

  1. A128
  2. B64
  3. C16
  4. D32
4.Medium

Which medium access method did classic shared (half-duplex) Ethernet use?

  1. ACSMA/CD
  2. BToken passing
  3. CTDMA
  4. DCSMA/CA
5.Medium

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

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

What is a cyclic redundancy check (CRC) used for in Ethernet frames?

  1. ACorrecting every bit error automatically
  2. BEncrypting the frame
  3. CChoosing the best route
  4. DDetecting transmission errors
7.Hard

Which routing protocol is a link-state protocol?

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

Answer key

  1. 1. A · The delay for data to travel from source to destination
  2. 2. A · 22
  3. 3. D · 32
  4. 4. A · CSMA/CD
  5. 5. D · 192.168.10.64
  6. 6. D · Detecting transmission errors
  7. 7. B · OSPF
  8. 8. A · Optional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait

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