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 is the name of the data unit at the data link layer?

  1. APacket
  2. BSegment
  3. CFrame
  4. DMessage
2.Easy

How many layers does the OSI reference model have?

  1. A4
  2. B7
  3. C9
  4. D5
3.Easy

In the client-server model:

  1. AClients send requests and a server provides the service
  2. BServers send requests and clients answer them
  3. CEvery computer stores the whole internet
  4. DAll devices must be in the same room
4.Medium

At which OSI layer does a switch normally operate?

  1. APhysical (layer 1)
  2. BNetwork (layer 3)
  3. CTransport (layer 4)
  4. DData link (layer 2)
5.Medium

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

  1. ADetecting transmission errors
  2. BChoosing the best route
  3. CEncrypting the frame
  4. DCorrecting every bit error automatically
6.Medium

What uniquely identifies one end of a TCP connection on the internet?

  1. AAn IP address together with a port number
  2. BA subnet mask and gateway
  3. CA domain name alone
  4. DA MAC address alone
7.Hard

By Shannon's theorem, what is the capacity of a 1 MHz channel with a signal-to-noise ratio of 255?

  1. A8 Mbit/s
  2. B255 Mbit/s
  3. C1 Mbit/s
  4. D2 Mbit/s
8.Hard

A TCP connection has a 64 KB window and a 100 ms round-trip time, and no window scaling. What is its approximate maximum throughput?

  1. AAbout 50 Mbit/s
  2. BAbout 640 Mbit/s
  3. CAbout 5 Mbit/s
  4. DAbout 0.5 Mbit/s

Answer key

  1. 1. C · Frame
  2. 2. B · 7
  3. 3. A · Clients send requests and a server provides the service
  4. 4. D · Data link (layer 2)
  5. 5. A · Detecting transmission errors
  6. 6. A · An IP address together with a port number
  7. 7. A · 8 Mbit/s
  8. 8. C · About 5 Mbit/s

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