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 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
2.Easy

What does LAN stand for?

  1. ALarge access network
  2. BLogical address number
  3. CLinked application node
  4. DLocal area network
3.Easy

How many bits does an IPv4 address have?

  1. A16
  2. B128
  3. C32
  4. D64
4.Medium

What uniquely identifies one end of a TCP connection on the internet?

  1. AA MAC address alone
  2. BAn IP address together with a port number
  3. CA domain name alone
  4. DA subnet mask and gateway
5.Medium

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

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

What is the network address of the host 192.168.10.77/26?

  1. A192.168.10.64
  2. B192.168.10.0
  3. C192.168.10.128
  4. D192.168.10.76
7.Hard

TCP congestion control's "slow start" phase:

  1. AIs used only by UDP
  2. BKeeps the window fixed at one segment
  3. CIncreases the congestion window exponentially until a threshold or loss
  4. DHalves the congestion window every round trip until a packet loss is detected
8.Hard

In a SYN flood attack, what resource is the attacker trying to exhaust?

  1. AThe server's disk space
  2. BThe switch's MAC address table
  3. CThe DNS cache of the client
  4. DThe server's table of half-open connections

Answer key

  1. 1. C · Hardware that connects a computer to a network
  2. 2. D · Local area network
  3. 3. C · 32
  4. 4. B · An IP address together with a port number
  5. 5. D · It tracks connections and allows replies that belong to established sessions
  6. 6. A · 192.168.10.64
  7. 7. C · Increases the congestion window exponentially until a threshold or loss
  8. 8. D · The server's table of half-open connections

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