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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy

How many bits does an IPv4 address have?

  1. A128
  2. B32
  3. C16
  4. D64
2.Easy

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

  1. AStar
  2. BFull mesh
  3. CRing
  4. DBus
3.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. CA cable that links two routers
  4. DSoftware that resolves domain names
4.Medium

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

  1. A254
  2. B256
  3. C255
  4. D252
5.Medium

What is the network address of the host 192.168.10.77/26?

  1. A192.168.10.128
  2. B192.168.10.0
  3. C192.168.10.64
  4. D192.168.10.76
6.Medium

Which IPv4 header field stops packets from circulating forever in a routing loop?

  1. ATime to live (TTL)
  2. BHeader checksum
  3. CType of service
  4. DIdentification
7.Hard

Hosts in VLAN 10 and VLAN 20 on the same switch cannot communicate. What is needed?

  1. AA longer cable between the hosts
  2. BA hub connected to both VLANs
  3. CThe same MAC address on both hosts
  4. DA router or layer 3 switch to route between the VLANs
8.Hard

A DNS cache poisoning attack aims to:

  1. ADelete DNS servers
  2. BSteal Wi-Fi passwords
  3. CMake a resolver store a false IP address for a domain
  4. DOverload a server with traffic so that it stops answering queries

Answer key

  1. 1. B · 32
  2. 2. A · Star
  3. 3. A · Hardware that connects a computer to a network
  4. 4. A · 254
  5. 5. C · 192.168.10.64
  6. 6. A · Time to live (TTL)
  7. 7. D · A router or layer 3 switch to route between the VLANs
  8. 8. C · Make a resolver store a false IP address for a domain

Full step-by-step solutions: practise this topic on examproblems.com.