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 is an IPv6 address usually written?

  1. AFour decimal numbers separated by dots
  2. BEight groups of four hexadecimal digits separated by colons
  3. CSixteen decimal numbers separated by dots
  4. DSix pairs of hexadecimal digits separated by dashes or colons
2.Easy

Which protocol gives secure, encrypted remote login to another computer?

  1. ASSH
  2. BTelnet
  3. CFTP
  4. DSNMP
3.Easy

What is a network interface card (NIC)?

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

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

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

What does an MX record in DNS specify?

  1. AThe IPv4 address of a web server
  2. BThe name servers for a zone
  3. CAn alias name for another host
  4. DThe mail servers that accept email for a domain
6.Medium

A router has routes for 10.0.0.0/8 and 10.1.0.0/16. Which route does it use for a packet to 10.1.5.5?

  1. A10.0.0.0/8, because it covers more addresses than the /16
  2. B10.1.0.0/16, because it is the longest matching prefix
  3. C10.0.0.0/8, because it was added first
  4. DBoth routes, splitting the traffic equally
7.Hard

What does TCP fast retransmit do?

  1. ASkips the three-way handshake when reconnecting to known hosts, so data is resent sooner
  2. BResends a segment after three duplicate ACKs, without waiting for the timeout
  3. CDoubles the window after every loss
  4. DResends every segment twice to be safe
8.Hard

Why does a browser warn when a site presents a self-signed certificate?

  1. AThe site must be using HTTP instead of HTTPS
  2. BSelf-signed certificates use no encryption at all, so the traffic is sent in clear text
  3. CNo trusted certificate authority vouches that the key belongs to that site
  4. DThe certificate is always expired

Answer key

  1. 1. B · Eight groups of four hexadecimal digits separated by colons
  2. 2. A · SSH
  3. 3. A · Hardware that connects a computer to a network
  4. 4. A · 10.1.200.5
  5. 5. D · The mail servers that accept email for a domain
  6. 6. B · 10.1.0.0/16, because it is the longest matching prefix
  7. 7. B · Resends a segment after three duplicate ACKs, without waiting for the timeout
  8. 8. C · No trusted certificate authority vouches that the key belongs to that site

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