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 networking, a protocol is:

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

Which OSI layer transmits raw bits as electrical, optical or radio signals?

  1. ASession layer
  2. BPhysical layer
  3. CNetwork layer
  4. DData link layer
3.Easy

What is the default port number for HTTPS?

  1. A443
  2. B21
  3. C80
  4. D25
4.Medium

Why is UDP often preferred for live video calls?

  1. AUDP encrypts data automatically
  2. BUDP is required for all video
  3. CUDP guarantees every packet arrives, so the picture never freezes
  4. DLow delay matters more than retransmitting every lost packet
5.Medium

What is the main purpose of a VLAN?

  1. ATo give each device a public IP address
  2. BTo encrypt all traffic between switches so other departments cannot read it
  3. CTo split one physical switched network into separate broadcast domains
  4. DTo increase the speed of every switch port
6.Medium

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

  1. ATo encrypt the data
  2. BTo close a connection quickly
  3. CTo find the IP address of a host before data can be sent to it
  4. DTo establish a connection and synchronise sequence numbers
7.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 50 Mbit/s
  2. BAbout 5 Mbit/s
  3. CAbout 0.5 Mbit/s
  4. DAbout 640 Mbit/s
8.Hard

Which of these addresses is a public (not RFC 1918 private) IPv4 address?

  1. A172.31.0.1
  2. B192.168.255.1
  3. C10.255.0.1
  4. D172.32.0.1

Answer key

  1. 1. A · A set of rules for the format and order of messages
  2. 2. B · Physical layer
  3. 3. A · 443
  4. 4. D · Low delay matters more than retransmitting every lost packet
  5. 5. C · To split one physical switched network into separate broadcast domains
  6. 6. D · To establish a connection and synchronise sequence numbers
  7. 7. B · About 5 Mbit/s
  8. 8. D · 172.32.0.1

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