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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1.Easy

What is a network interface card (NIC)?

  1. ASoftware that resolves domain names
  2. BA server that stores web pages
  3. CHardware that connects a computer to a network
  4. DA cable that links two routers
2.Easy

In which network topology is every device connected to one central switch or hub?

  1. AFull mesh
  2. BRing
  3. CStar
  4. DBus
3.Easy

What does DNS do?

  1. AEncrypts web traffic
  2. BRoutes packets between networks
  3. CAssigns IP addresses to devices automatically
  4. DTranslates domain names into IP addresses
4.Medium

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

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

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

  1. A1 ms
  2. B0.125 ms
  3. C8 ms
  4. D12 ms
6.Medium

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

  1. AAAAA
  2. BA
  3. CMX
  4. DCNAME
7.Hard

Why does TCP choose an unpredictable initial sequence number for each connection?

  1. ATo select the best route to the destination for the segments of that connection
  2. BTo avoid confusion with old segments and make spoofed segments harder to inject
  3. CTo encrypt the payload of each segment
  4. DTo compress the data more efficiently
8.Hard

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

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

Answer key

  1. 1. C · Hardware that connects a computer to a network
  2. 2. C · Star
  3. 3. D · Translates domain names into IP addresses
  4. 4. C · An IP address together with a port number
  5. 5. A · 1 ms
  6. 6. A · AAAA
  7. 7. B · To avoid confusion with old segments and make spoofed segments harder to inject
  8. 8. A · To lower the chance of colliding again when many stations compete

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