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, what does bandwidth usually refer to?

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

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

  1. Atraceroute (tracert on Windows)
  2. Bipconfig
  3. Cnslookup
  4. Dnetstat
3.Easy

What is the broadcast address of the network 192.168.1.0/24?

  1. A192.168.1.255
  2. B255.255.255.0
  3. C192.168.1.0
  4. D192.168.1.1
4.Medium

What characterises a distributed denial-of-service (DDoS) attack?

  1. AMany compromised machines flood a target with traffic
  2. BA virus deletes files on a single PC
  3. CAn attacker reads unencrypted Wi-Fi traffic from a nearby car
  4. DOne attacker guesses a user's password
5.Medium

NAT (network address translation) is mainly used to:

  1. ALet many devices with private addresses share one public IP address
  2. BIncrease the speed of a network cable
  3. CEncrypt traffic between two sites
  4. DTranslate domain names into IP addresses for devices on a local network
6.Medium

What is the role of a default gateway on a host?

  1. AIt is the DNS server
  2. BIt assigns MAC addresses
  3. CIt is the router used for traffic to other networks
  4. DIt is the switch port the host is connected to
7.Hard

What does the Diffie-Hellman key exchange achieve on its own, and what is its weakness?

  1. AIt agrees a shared secret over a public channel, but alone it is open to a man-in-the-middle
  2. BIt authenticates both users with passwords, but needs a central server
  3. CIt signs certificates for websites, but only works with short keys
  4. DIt encrypts bulk data directly over a public channel, but it is far too slow for large files and video
8.Hard

By the Nyquist formula, what is the maximum bit rate of a noiseless 3 kHz channel using 4 signal levels?

  1. A12 kbit/s
  2. B6 kbit/s
  3. C24 kbit/s
  4. D3 kbit/s

Answer key

  1. 1. D · The maximum data rate a link can carry
  2. 2. A · traceroute (tracert on Windows)
  3. 3. A · 192.168.1.255
  4. 4. A · Many compromised machines flood a target with traffic
  5. 5. A · Let many devices with private addresses share one public IP address
  6. 6. C · It is the router used for traffic to other networks
  7. 7. A · It agrees a shared secret over a public channel, but alone it is open to a man-in-the-middle
  8. 8. A · 12 kbit/s

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