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

Which protocol lets an email client read mail while keeping messages and folders on the server?

  1. ADHCP
  2. BIMAP
  3. CSNMP
  4. DSMTP
2.Easy

What is the default port number for HTTPS?

  1. A80
  2. B443
  3. C21
  4. D25
3.Easy

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

  1. AMessage
  2. BSegment
  3. CPacket
  4. DFrame
4.Medium

Which protocol does the "ping" command use?

  1. ATCP
  2. BHTTP
  3. CUDP
  4. DICMP
5.Medium

Which metric does RIP use to choose routes?

  1. AMeasured delay
  2. BHop count
  3. CBusiness policy
  4. DLink bandwidth
6.Medium

What characterises a distributed denial-of-service (DDoS) attack?

  1. AA virus deletes files on a single PC
  2. BOne attacker guesses a user's password
  3. CAn attacker reads unencrypted Wi-Fi traffic from a nearby car
  4. DMany compromised machines flood a target with traffic
7.Hard

After repeated collisions, classic Ethernet stations choose their waiting time from a range that doubles each time. Why?

  1. ATo make the cable carry signals further
  2. BTo lower the chance of colliding again when many stations compete
  3. CTo give the station with the highest MAC address priority on the shared cable
  4. DTo synchronise all stations to one clock
8.Hard

A DNS cache poisoning attack aims to:

  1. AMake a resolver store a false IP address for a domain
  2. BOverload a server with traffic so that it stops answering queries
  3. CSteal Wi-Fi passwords
  4. DDelete DNS servers

Answer key

  1. 1. B · IMAP
  2. 2. B · 443
  3. 3. D · Frame
  4. 4. D · ICMP
  5. 5. B · Hop count
  6. 6. D · Many compromised machines flood a target with traffic
  7. 7. B · To lower the chance of colliding again when many stations compete
  8. 8. A · Make a resolver store a false IP address for a domain

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