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 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
2.Easy

What does LAN stand for?

  1. ALogical address number
  2. BLocal area network
  3. CLinked application node
  4. DLarge access network
3.Easy

How is an IPv6 address usually written?

  1. ASixteen decimal numbers separated by dots
  2. BEight groups of four hexadecimal digits separated by colons
  3. CFour decimal numbers separated by dots
  4. DSix pairs of hexadecimal digits separated by dashes or colons
4.Medium

What is the purpose of the TCP three-way handshake?

  1. ATo find the IP address of a host before data can be sent to it
  2. BTo establish a connection and synchronise sequence numbers
  3. CTo encrypt the data
  4. DTo close a connection quickly
5.Medium

How many usable host addresses does a /26 IPv4 subnet have?

  1. A64
  2. B30
  3. C126
  4. D62
6.Medium

NAT (network address translation) is mainly used to:

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

In a TCP connection, what does the receive window (rwnd) control?

  1. AThe retransmission time-out, calculated from the measured round-trip time of each segment
  2. BThe size of each IP packet header
  3. CHow much unacknowledged data the sender may send, based on the receiver's buffer
  4. DThe number of open ports
8.Hard

You must divide 192.168.1.0/24 into at least 5 subnets with up to 25 hosts each. Which prefix length fits best?

  1. A/26
  2. B/28
  3. C/27
  4. D/25

Answer key

  1. 1. D · Translates domain names into IP addresses
  2. 2. B · Local area network
  3. 3. B · Eight groups of four hexadecimal digits separated by colons
  4. 4. B · To establish a connection and synchronise sequence numbers
  5. 5. D · 62
  6. 6. D · Let many devices with private addresses share one public IP address
  7. 7. C · How much unacknowledged data the sender may send, based on the receiver's buffer
  8. 8. C · /27

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