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

How many bits does an IPv4 address have?

  1. A32
  2. B16
  3. C64
  4. D128
2.Easy

Which type of cable carries data as pulses of light?

  1. AFibre-optic cable
  2. BTwisted-pair cable
  3. CCoaxial cable
  4. DShielded copper cable
3.Easy

What is the main job of a firewall?

  1. ATo assign IP addresses to hosts
  2. BTo convert domain names into addresses
  3. CTo allow or block traffic according to security rules
  4. DTo speed up downloads by caching files
4.Medium

Which protocol does the "ping" command use?

  1. ATCP
  2. BICMP
  3. CHTTP
  4. DUDP
5.Medium

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

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

How many usable host addresses does a /24 IPv4 network have?

  1. A256
  2. B252
  3. C255
  4. D254
7.Hard

A path has 100 Mbit/s bandwidth and a 40 ms round-trip time. How much data must be in flight to keep it fully used?

  1. A2.5 MB
  2. B50 kB
  3. C4 kB
  4. D500 kB
8.Hard

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

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

Answer key

  1. 1. A · 32
  2. 2. A · Fibre-optic cable
  3. 3. C · To allow or block traffic according to security rules
  4. 4. B · ICMP
  5. 5. A · Detecting transmission errors
  6. 6. D · 254
  7. 7. D · 500 kB
  8. 8. C · No trusted certificate authority vouches that the key belongs to that site

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