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

In which network topology is every device connected to one central switch or hub?

  1. ABus
  2. BStar
  3. CRing
  4. DFull mesh
2.Easy

What does a VPN mainly provide?

  1. AAn encrypted tunnel across an untrusted network such as the internet
  2. BAutomatic backup of files to a server
  3. CA faster physical connection to the internet through a dedicated line
  4. DA free public IP address for every device
3.Easy

Which type of cable carries data as pulses of light?

  1. ACoaxial cable
  2. BTwisted-pair cable
  3. CShielded copper cable
  4. DFibre-optic cable
4.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. CRoutes packets on the internet
  4. DResolves domain names
5.Medium

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

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

Which range of TCP/UDP port numbers is reserved as "well-known" ports?

  1. A0–65535
  2. B0–1023
  3. C1024–49151
  4. D49152–65535
7.Hard

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

  1. A24 kbit/s
  2. B3 kbit/s
  3. C12 kbit/s
  4. D6 kbit/s
8.Hard

How does fragmentation differ in IPv6 compared with IPv4?

  1. AIPv6 fragments at the transport layer inside TCP
  2. BRouters never fragment IPv6 packets; only the source can, using path MTU discovery
  3. CIPv6 routers fragment every packet larger than 64 bytes before forwarding it on the path
  4. DIPv6 does not allow packets larger than 576 bytes

Answer key

  1. 1. B · Star
  2. 2. A · An encrypted tunnel across an untrusted network such as the internet
  3. 3. D · Fibre-optic cable
  4. 4. A · Finds the MAC address that belongs to an IP address on the local network
  5. 5. B · A wireless station cannot reliably detect collisions while it is transmitting
  6. 6. B · 0–1023
  7. 7. C · 12 kbit/s
  8. 8. B · Routers never fragment IPv6 packets; only the source can, using path MTU discovery

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