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

Which IPv4 address is the standard loopback address of a host?

  1. A192.168.0.1
  2. B127.0.0.1
  3. C255.255.255.255
  4. D0.0.0.0
2.Easy

How is an IPv6 address usually written?

  1. ASixteen decimal numbers separated by dots
  2. BEight groups of four hexadecimal digits separated by colons
  3. CFour decimal numbers separated by dots
  4. DSix pairs of hexadecimal digits separated by dashes or colons
3.Easy

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

  1. ANetwork layer
  2. BSession layer
  3. CData link layer
  4. DPhysical layer
4.Medium

What does a subnet mask of 255.255.255.0 correspond to in CIDR notation?

  1. A/24
  2. B/8
  3. C/32
  4. D/16
5.Medium

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

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

How many usable host addresses does a /26 IPv4 subnet have?

  1. A30
  2. B62
  3. C64
  4. D126
7.Hard

In a TCP connection, what does the receive window (rwnd) control?

  1. AThe size of each IP packet header
  2. BThe number of open ports
  3. CHow much unacknowledged data the sender may send, based on the receiver's buffer
  4. DThe retransmission time-out, calculated from the measured round-trip time of each segment
8.Hard

What is the maximum transmission unit (MTU) of standard Ethernet payload?

  1. A9000 bytes in every network
  2. B65,535 bytes
  3. C64 bytes
  4. D1500 bytes

Answer key

  1. 1. B · 127.0.0.1
  2. 2. B · Eight groups of four hexadecimal digits separated by colons
  3. 3. D · Physical layer
  4. 4. A · /24
  5. 5. A · It tracks connections and allows replies that belong to established sessions
  6. 6. B · 62
  7. 7. C · How much unacknowledged data the sender may send, based on the receiver's buffer
  8. 8. D · 1500 bytes

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