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

A MAC address identifies:

  1. AA website
  2. BA router's public IP
  3. CA user account
  4. DA network interface on the local link
2.Easy

What is a network interface card (NIC)?

  1. AA cable that links two routers
  2. BA server that stores web pages
  3. CHardware that connects a computer to a network
  4. DSoftware that resolves domain names
3.Easy

What does LAN stand for?

  1. ALogical address number
  2. BLinked application node
  3. CLocal area network
  4. DLarge access network
4.Medium

What does an MX record in DNS specify?

  1. AThe name servers for a zone
  2. BAn alias name for another host
  3. CThe mail servers that accept email for a domain
  4. DThe IPv4 address of a web server
5.Medium

What is the main purpose of a VLAN?

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

Which single prefix summarises both 192.168.0.0/24 and 192.168.1.0/24?

  1. A192.168.0.0/23
  2. B192.168.0.0/25
  3. C192.168.1.0/23
  4. D192.168.0.0/22
7.Hard

Why does TCP choose an unpredictable initial sequence number for each connection?

  1. ATo encrypt the payload of each segment
  2. BTo select the best route to the destination for the segments of that connection
  3. CTo avoid confusion with old segments and make spoofed segments harder to inject
  4. DTo compress the data more efficiently
8.Hard

With sliding-window protocols, how does Go-Back-N differ from Selective Repeat after one frame is lost?

  1. ABoth resend the whole window from the start
  2. BGo-Back-N resends only the lost frame; Selective Repeat resends that frame and all later ones
  3. CNeither ever resends lost frames
  4. DGo-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one

Answer key

  1. 1. D · A network interface on the local link
  2. 2. C · Hardware that connects a computer to a network
  3. 3. C · Local area network
  4. 4. C · The mail servers that accept email for a domain
  5. 5. D · To split one physical switched network into separate broadcast domains
  6. 6. A · 192.168.0.0/23
  7. 7. C · To avoid confusion with old segments and make spoofed segments harder to inject
  8. 8. D · Go-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one

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