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

Which protocol lets an email client read mail while keeping messages and folders on the server?

  1. AIMAP
  2. BSMTP
  3. CDHCP
  4. DSNMP
2.Easy

In a peer-to-peer network:

  1. AOne central server handles every request
  2. BEach node can act as both a client and a server
  3. CDevices cannot communicate directly
  4. DOnly routers may share files
3.Easy

What is the default port number for DNS?

  1. A67
  2. B53
  3. C161
  4. D80
4.Medium

Which of these is a private IPv4 address range?

  1. A100.0.0.0/8
  2. B8.8.8.0/24
  3. C200.1.1.0/24
  4. D192.168.0.0/16
5.Medium

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

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

Which TCP flag signals that a sender has finished sending data?

  1. AURG
  2. BPSH
  3. CSYN
  4. DFIN
7.Hard

A path has 100 Mbit/s bandwidth and a 40 ms round-trip time. How much data must be in flight to keep it fully used?

  1. A50 kB
  2. B4 kB
  3. C2.5 MB
  4. D500 kB
8.Hard

How does a content delivery network (CDN) mainly improve web performance?

  1. AIt replaces TCP with a faster transport protocol
  2. BIt serves cached content from servers close to the users
  3. CIt removes the need for DNS lookups
  4. DIt increases the bandwidth of the users' own home connections

Answer key

  1. 1. A · IMAP
  2. 2. B · Each node can act as both a client and a server
  3. 3. B · 53
  4. 4. D · 192.168.0.0/16
  5. 5. C · It tracks connections and allows replies that belong to established sessions
  6. 6. D · FIN
  7. 7. D · 500 kB
  8. 8. B · It serves cached content from servers close to the users

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