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. AMessage
  2. BFrame
  3. CPacket
  4. DSegment
2.Easy

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

  1. ASession layer
  2. BPhysical layer
  3. CData link layer
  4. DNetwork layer
3.Easy

How many bits does an IPv4 address have?

  1. A16
  2. B128
  3. C32
  4. D64
4.Medium

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

  1. AA MAC address alone
  2. BA domain name alone
  3. CAn IP address together with a port number
  4. DA subnet mask and gateway
5.Medium

Which DNS record type maps a host name to an IPv6 address?

  1. AAAAA
  2. BMX
  3. CCNAME
  4. DA
6.Medium

How long does it take to put a 1500-byte packet onto a 12 Mbit/s link (transmission delay)?

  1. A12 ms
  2. B1 ms
  3. C8 ms
  4. D0.125 ms
7.Hard

Why does a browser warn when a site presents a self-signed certificate?

  1. AThe site must be using HTTP instead of HTTPS
  2. BSelf-signed certificates use no encryption at all, so the traffic is sent in clear text
  3. CNo trusted certificate authority vouches that the key belongs to that site
  4. DThe certificate is always expired
8.Hard

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

  1. A255 Mbit/s
  2. B8 Mbit/s
  3. C2 Mbit/s
  4. D1 Mbit/s

Answer key

  1. 1. B · Frame
  2. 2. B · Physical layer
  3. 3. C · 32
  4. 4. C · An IP address together with a port number
  5. 5. A · AAAA
  6. 6. B · 1 ms
  7. 7. C · No trusted certificate authority vouches that the key belongs to that site
  8. 8. B · 8 Mbit/s

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