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

What does "latency" mean in networking?

  1. AThe maximum amount of data per second that a link can carry
  2. BThe number of devices on a network
  3. CThe error rate of a cable
  4. DThe delay for data to travel from source to destination
2.Easy

Which type of network covers a large geographic area, such as a whole country?

  1. AA personal area network (PAN)
  2. BA virtual LAN (VLAN)
  3. CA local area network (LAN)
  4. DA wide area network (WAN)
3.Easy

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

  1. AFull mesh
  2. BRing
  3. CBus
  4. DStar
4.Medium

How does a stateful firewall differ from a simple packet filter?

  1. AIt tracks connections and allows replies that belong to established sessions
  2. BIt only checks the MAC address of each frame
  3. CIt blocks all incoming traffic without exceptions, including replies to outgoing requests
  4. DIt encrypts every packet it forwards
5.Medium

Which subnet mask corresponds to /20?

  1. A255.255.248.0
  2. B255.255.240.0
  3. C255.255.255.240
  4. D255.255.224.0
6.Medium

NAT (network address translation) is mainly used to:

  1. AIncrease the speed of a network cable
  2. BEncrypt traffic between two sites
  3. CTranslate domain names into IP addresses for devices on a local network
  4. DLet many devices with private addresses share one public IP address
7.Hard

Head-of-line blocking in HTTP/2 over TCP occurs because:

  1. AEach request needs its own new TCP connection, so later requests wait in a queue
  2. BHTTP/2 uses UDP
  3. CA lost TCP segment delays all multiplexed streams until it is retransmitted
  4. DServers cannot handle parallel requests
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 0.5 Mbit/s
  2. BAbout 640 Mbit/s
  3. CAbout 50 Mbit/s
  4. DAbout 5 Mbit/s

Answer key

  1. 1. D · The delay for data to travel from source to destination
  2. 2. D · A wide area network (WAN)
  3. 3. D · Star
  4. 4. A · It tracks connections and allows replies that belong to established sessions
  5. 5. B · 255.255.240.0
  6. 6. D · Let many devices with private addresses share one public IP address
  7. 7. C · A lost TCP segment delays all multiplexed streams until it is retransmitted
  8. 8. D · About 5 Mbit/s

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