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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1.Easy

In networking, a protocol is:

  1. AA program that blocks viruses
  2. BA set of rules for the format and order of messages
  3. CA physical cable between two devices
  4. DA list of all devices on a network
2.Easy

In networking, what does bandwidth usually refer to?

  1. AThe maximum data rate a link can carry
  2. BThe number of hops to a destination
  3. CThe share of packets that are lost
  4. DThe delay before data arrives
3.Easy

What is throughput?

  1. AThe time a packet takes to cross a link
  2. BThe number of routers on a path
  3. CThe theoretical maximum rate a link can carry under ideal conditions
  4. DThe rate at which data is actually delivered successfully
4.Medium

What is a cyclic redundancy check (CRC) used for in Ethernet frames?

  1. ADetecting transmission errors
  2. BCorrecting every bit error automatically
  3. CChoosing the best route
  4. DEncrypting the frame
5.Medium

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

  1. A0.1 ms
  2. B10 ms
  3. C100 ms
  4. D1 ms
6.Medium

Which DNS record type maps a host name to an IPv6 address?

  1. AAAAA
  2. BCNAME
  3. CA
  4. DMX
7.Hard

An attacker on a LAN sends forged ARP replies claiming the gateway's IP address. What is the likely result?

  1. AThe gateway's IP address is permanently changed to the attacker's address on every router
  2. BAll DNS queries fail across the internet
  3. CVictims send traffic for the gateway to the attacker, enabling a man-in-the-middle attack
  4. DThe switch shuts down all of its ports
8.Hard

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

  1. AName resolution (DNS)
  2. BThe physical cable
  3. CThe network card driver
  4. DThe default gateway

Answer key

  1. 1. B · A set of rules for the format and order of messages
  2. 2. A · The maximum data rate a link can carry
  3. 3. D · The rate at which data is actually delivered successfully
  4. 4. A · Detecting transmission errors
  5. 5. B · 10 ms
  6. 6. A · AAAA
  7. 7. C · Victims send traffic for the gateway to the attacker, enabling a man-in-the-middle attack
  8. 8. A · Name resolution (DNS)

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