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 throughput?

  1. AThe rate at which data is actually delivered successfully
  2. BThe theoretical maximum rate a link can carry under ideal conditions
  3. CThe time a packet takes to cross a link
  4. DThe number of routers on a path
2.Easy

What is a network interface card (NIC)?

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

How many bits does an IPv4 address have?

  1. A16
  2. B32
  3. C128
  4. D64
4.Medium

Which host is in the same /16 subnet as 10.1.2.3?

  1. A10.0.2.3
  2. B10.2.2.3
  3. C11.1.2.3
  4. D10.1.200.5
5.Medium

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

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

NAT (network address translation) is mainly used to:

  1. ALet many devices with private addresses share one public IP address
  2. BEncrypt traffic between two sites
  3. CTranslate domain names into IP addresses for devices on a local network
  4. DIncrease the speed of a network cable
7.Hard

How does a content delivery network (CDN) mainly improve web performance?

  1. AIt removes the need for DNS lookups
  2. BIt replaces TCP with a faster transport protocol
  3. CIt serves cached content from servers close to the users
  4. DIt increases the bandwidth of the users' own home connections
8.Hard

With sliding-window protocols, how does Go-Back-N differ from Selective Repeat after one frame is lost?

  1. AGo-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one
  2. BGo-Back-N resends only the lost frame; Selective Repeat resends that frame and all later ones
  3. CBoth resend the whole window from the start
  4. DNeither ever resends lost frames

Answer key

  1. 1. A · The rate at which data is actually delivered successfully
  2. 2. A · Hardware that connects a computer to a network
  3. 3. B · 32
  4. 4. D · 10.1.200.5
  5. 5. C · Detecting transmission errors
  6. 6. A · Let many devices with private addresses share one public IP address
  7. 7. C · It serves cached content from servers close to the users
  8. 8. A · Go-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one

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