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

Which application protocol is used to request web pages from a web server?

  1. AARP
  2. BSMTP
  3. CHTTP
  4. DSNMP
2.Easy

What does a packet header mainly contain?

  1. AThe website's text and images
  2. BThe user's actual file contents, split into equal-sized pieces
  3. CThe cable type used for the link
  4. DControl information such as source and destination addresses
3.Easy

What is the default port number for SSH?

  1. A53
  2. B22
  3. C23
  4. D110
4.Medium

A signal travels 2000 km through fibre at about 2 × 10⁸ m/s. What is the propagation delay?

  1. A100 ms
  2. B10 ms
  3. C1 ms
  4. D0.1 ms
5.Medium

Why does Wi-Fi use collision avoidance (CSMA/CA) instead of collision detection?

  1. AA wireless station cannot reliably detect collisions while it is transmitting
  2. BRadio signals never collide
  3. CWi-Fi only allows one device per network
  4. DCollision detection only works on fibre cables, not on shared wireless radio channels
6.Medium

What does ARP do?

  1. AFinds the MAC address that belongs to an IP address on the local network
  2. BAssigns IP addresses automatically to hosts when they join the local network
  3. CResolves domain names
  4. DRoutes packets on the internet
7.Hard

A user can ping 8.8.8.8 but cannot open any website by name. Where is the problem most likely?

  1. AThe default gateway
  2. BThe network card driver
  3. CThe physical cable
  4. DName resolution (DNS)
8.Hard

A student runs a game server on a PC behind a home NAT router. Friends on the internet cannot connect. What is the usual fix?

  1. AConfigure port forwarding on the router to the PC's private address
  2. BGive the PC a different MAC address so the router can find it from outside
  3. CChange the PC's subnet mask to /32
  4. DTurn off the PC's DNS client

Answer key

  1. 1. C · HTTP
  2. 2. D · Control information such as source and destination addresses
  3. 3. B · 22
  4. 4. B · 10 ms
  5. 5. A · A wireless station cannot reliably detect collisions while it is transmitting
  6. 6. A · Finds the MAC address that belongs to an IP address on the local network
  7. 7. D · Name resolution (DNS)
  8. 8. A · Configure port forwarding on the router to the PC's private address

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