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, what does bandwidth usually refer to?

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

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

  1. A192.168.1.0
  2. B192.168.1.1
  3. C255.255.255.0
  4. D192.168.1.255
3.Easy

How many bits does an IPv4 address have?

  1. A64
  2. B32
  3. C128
  4. D16
4.Medium

What is a cyclic redundancy check (CRC) used for in Ethernet frames?

  1. AChoosing the best route
  2. BDetecting transmission errors
  3. CEncrypting the frame
  4. DCorrecting every bit error automatically
5.Medium

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

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

Which subnet mask corresponds to /20?

  1. A255.255.240.0
  2. B255.255.255.240
  3. C255.255.224.0
  4. D255.255.248.0
7.Hard

A PC can reach printers on its own subnet but nothing beyond it. Its IP address and mask are correct. What is the most likely fault?

  1. AA faulty DNS server setting
  2. BA duplicate MAC address on the internet
  3. CA missing or wrong default gateway
  4. DThe TCP window is too small
8.Hard

Why was the TCP window scale option introduced?

  1. AWithout it, TCP could not detect lost segments on long-distance links
  2. BThe 32-bit window field was too large and wasted header space in every TCP segment sent
  3. CUDP needed a way to control its sending rate on congested paths
  4. DThe 16-bit window field limits the window to 65,535 bytes, too small for fast long-distance paths

Answer key

  1. 1. B · The maximum data rate a link can carry
  2. 2. D · 192.168.1.255
  3. 3. B · 32
  4. 4. B · Detecting transmission errors
  5. 5. C · To establish a connection and synchronise sequence numbers
  6. 6. A · 255.255.240.0
  7. 7. C · A missing or wrong default gateway
  8. 8. D · The 16-bit window field limits the window to 65,535 bytes, too small for fast long-distance paths

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