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

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
2.Easy

What does "latency" mean in networking?

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

Which IEEE standard family defines wired Ethernet?

  1. AIEEE 802.11
  2. BIEEE 802.16
  3. CIEEE 802.5
  4. DIEEE 802.3
4.Medium

What is the purpose of the TCP three-way handshake?

  1. ATo establish a connection and synchronise sequence numbers
  2. BTo close a connection quickly
  3. CTo encrypt the data
  4. DTo find the IP address of a host before data can be sent to it
5.Medium

Which subnet mask corresponds to /20?

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

What does an MX record in DNS specify?

  1. AThe name servers for a zone
  2. BThe IPv4 address of a web server
  3. CAn alias name for another host
  4. DThe mail servers that accept email for a domain
7.Hard

In the TCP/IP model, which layer adds port numbers?

  1. AInternet layer
  2. BApplication layer
  3. CTransport layer
  4. DLink layer
8.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. CServers cannot handle parallel requests
  4. DA lost TCP segment delays all multiplexed streams until it is retransmitted

Answer key

  1. 1. D · Control information such as source and destination addresses
  2. 2. D · The delay for data to travel from source to destination
  3. 3. D · IEEE 802.3
  4. 4. A · To establish a connection and synchronise sequence numbers
  5. 5. A · 255.255.240.0
  6. 6. D · The mail servers that accept email for a domain
  7. 7. C · Transport layer
  8. 8. D · A lost TCP segment delays all multiplexed streams until it is retransmitted

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