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

What does "latency" mean in networking?

  1. AThe error rate of a cable
  2. BThe number of devices on a network
  3. CThe delay for data to travel from source to destination
  4. DThe maximum amount of data per second that a link can carry
2.Easy

What does LAN stand for?

  1. ALinked application node
  2. BLocal area network
  3. CLarge access network
  4. DLogical address number
3.Easy

Which protocol is used to send email between mail servers?

  1. ASNMP
  2. BSMTP
  3. CIMAP
  4. DPOP3
4.Medium

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

  1. A192.168.0.0/22
  2. B192.168.0.0/23
  3. C192.168.1.0/23
  4. D192.168.0.0/25
5.Medium

What is the main difference between the HTTP methods GET and POST?

  1. AGET deletes a resource, POST reads it from the server's database
  2. BGET is encrypted, POST is not
  3. CGET uses UDP, POST uses TCP
  4. DGET retrieves a resource, POST submits data in the request body
6.Medium

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

  1. A62
  2. B64
  3. C126
  4. D30
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

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

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

Answer key

  1. 1. C · The delay for data to travel from source to destination
  2. 2. B · Local area network
  3. 3. B · SMTP
  4. 4. B · 192.168.0.0/23
  5. 5. D · GET retrieves a resource, POST submits data in the request body
  6. 6. A · 62
  7. 7. B · Path MTU discovery fails because "fragmentation needed" messages are blocked
  8. 8. D · Go-Back-N resends the lost frame and all later ones; Selective Repeat only the lost one

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