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

Which protocol lets an email client read mail while keeping messages and folders on the server?

  1. ASNMP
  2. BDHCP
  3. CSMTP
  4. DIMAP
2.Easy

Which application protocol transfers files using separate control and data connections?

  1. AFTP
  2. BHTTP
  3. CDNS
  4. DSMTP
3.Easy

What does a VPN mainly provide?

  1. AA free public IP address for every device
  2. BA faster physical connection to the internet through a dedicated line
  3. CAutomatic backup of files to a server
  4. DAn encrypted tunnel across an untrusted network such as the internet
4.Medium

At which OSI layer does a switch normally operate?

  1. ATransport (layer 4)
  2. BNetwork (layer 3)
  3. CData link (layer 2)
  4. DPhysical (layer 1)
5.Medium

Why is UDP often preferred for live video calls?

  1. ALow delay matters more than retransmitting every lost packet
  2. BUDP is required for all video
  3. CUDP guarantees every packet arrives, so the picture never freezes
  4. DUDP encrypts data automatically
6.Medium

Which of these is a private IPv4 address range?

  1. A100.0.0.0/8
  2. B8.8.8.0/24
  3. C192.168.0.0/16
  4. D200.1.1.0/24
7.Hard

Why does IPv6 not need NAT for address shortage?

  1. AIPv6 does not use addresses
  2. BIPv6 encrypts all addresses
  3. CIts 128-bit address space is large enough to give every device a global address
  4. DIPv6 only works on local networks, so addresses never need to be shared globally
8.Hard

Head-of-line blocking in HTTP/2 over TCP occurs because:

  1. AHTTP/2 uses UDP
  2. BServers cannot handle parallel requests
  3. CA lost TCP segment delays all multiplexed streams until it is retransmitted
  4. DEach request needs its own new TCP connection, so later requests wait in a queue

Answer key

  1. 1. D · IMAP
  2. 2. A · FTP
  3. 3. D · An encrypted tunnel across an untrusted network such as the internet
  4. 4. C · Data link (layer 2)
  5. 5. A · Low delay matters more than retransmitting every lost packet
  6. 6. C · 192.168.0.0/16
  7. 7. C · Its 128-bit address space is large enough to give every device a global address
  8. 8. C · A lost TCP segment delays all multiplexed streams until it is retransmitted

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