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

Which command shows the routers a packet passes through on its way to a destination?

  1. Anslookup
  2. Bnetstat
  3. Ctraceroute (tracert on Windows)
  4. Dipconfig
2.Easy

What is the default port number for SSH?

  1. A23
  2. B110
  3. C53
  4. D22
3.Easy

Which type of cable carries data as pulses of light?

  1. AFibre-optic cable
  2. BShielded copper cable
  3. CCoaxial cable
  4. DTwisted-pair cable
4.Medium

What is the usual order of messages when a client obtains an address from DHCP?

  1. ARequest, Offer, Discover, Acknowledge
  2. BOffer, Discover, Acknowledge, Request
  3. CDiscover, Request, Offer, Acknowledge
  4. DDiscover, Offer, Request, Acknowledge
5.Medium

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

  1. A256
  2. B252
  3. C255
  4. D254
6.Medium

Why does a switch sometimes send a frame out of all ports except the one it came in on?

  1. AThe frame has a wrong IP checksum and must be checked by every host
  2. BThe frame is too large for one port
  3. CThe switch is acting as a router
  4. DThe destination MAC address is not yet in its address table
7.Hard

Which of these addresses is a public (not RFC 1918 private) IPv4 address?

  1. A172.31.0.1
  2. B172.32.0.1
  3. C192.168.255.1
  4. D10.255.0.1
8.Hard

A TCP connection has a 64 KB window and a 100 ms round-trip time, and no window scaling. What is its approximate maximum throughput?

  1. AAbout 5 Mbit/s
  2. BAbout 0.5 Mbit/s
  3. CAbout 640 Mbit/s
  4. DAbout 50 Mbit/s

Answer key

  1. 1. C · traceroute (tracert on Windows)
  2. 2. D · 22
  3. 3. A · Fibre-optic cable
  4. 4. D · Discover, Offer, Request, Acknowledge
  5. 5. D · 254
  6. 6. D · The destination MAC address is not yet in its address table
  7. 7. B · 172.32.0.1
  8. 8. A · About 5 Mbit/s

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