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

How is an IPv6 address usually written?

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

Which protocol gives secure, encrypted remote login to another computer?

  1. ASNMP
  2. BFTP
  3. CTelnet
  4. DSSH
3.Easy

Which IEEE standard family defines Wi-Fi wireless LANs?

  1. AIEEE 802.15
  2. BIEEE 802.1Q
  3. CIEEE 802.11
  4. DIEEE 802.3
4.Medium

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

  1. APSH
  2. BFIN
  3. CSYN
  4. DURG
5.Medium

Using even parity, which parity bit is added to the data bits 1011001?

  1. A2
  2. B1
  3. C0
  4. D4
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. B192.168.0.0/22
  3. C192.168.1.0/23
  4. D192.168.0.0/25
7.Hard

A firewall blocks all ICMP. Small web requests work, but large downloads over some paths hang. What is the likely cause?

  1. ATLS certificates are sent over ICMP
  2. BPath MTU discovery fails because "fragmentation needed" messages are blocked
  3. CTCP cannot open connections without ICMP
  4. DDNS needs ICMP to resolve names
8.Hard

After repeated collisions, classic Ethernet stations choose their waiting time from a range that doubles each time. Why?

  1. ATo make the cable carry signals further
  2. BTo synchronise all stations to one clock
  3. CTo lower the chance of colliding again when many stations compete
  4. DTo give the station with the highest MAC address priority on the shared cable

Answer key

  1. 1. A · Eight groups of four hexadecimal digits separated by colons
  2. 2. D · SSH
  3. 3. C · IEEE 802.11
  4. 4. B · FIN
  5. 5. C · 0
  6. 6. A · 192.168.0.0/23
  7. 7. B · Path MTU discovery fails because "fragmentation needed" messages are blocked
  8. 8. C · To lower the chance of colliding again when many stations compete

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