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 is the default port number for HTTPS?

  1. A80
  2. B443
  3. C25
  4. D21
2.Easy

Which device forwards packets between different networks based on IP addresses?

  1. AA repeater
  2. BA switch
  3. CA router
  4. DA hub
3.Easy

What is throughput?

  1. AThe time a packet takes to cross a link
  2. BThe theoretical maximum rate a link can carry under ideal conditions
  3. CThe number of routers on a path
  4. DThe rate at which data is actually delivered successfully
4.Medium

Which protocol does the "ping" command use?

  1. AHTTP
  2. BICMP
  3. CUDP
  4. DTCP
5.Medium

TLS provides which security properties for HTTPS?

  1. AConfidentiality, integrity and server authentication
  2. BOnly faster loading
  3. CProtection against all malware and phishing on the visited site
  4. DAnonymity of the user
6.Medium

Why does a switch sometimes send a frame out of all ports except the one it came in on?

  1. AThe frame is too large for one port
  2. BThe destination MAC address is not yet in its address table
  3. CThe switch is acting as a router
  4. DThe frame has a wrong IP checksum and must be checked by every host
7.Hard

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

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

By the Nyquist formula, what is the maximum bit rate of a noiseless 3 kHz channel using 4 signal levels?

  1. A24 kbit/s
  2. B6 kbit/s
  3. C12 kbit/s
  4. D3 kbit/s

Answer key

  1. 1. B · 443
  2. 2. C · A router
  3. 3. D · The rate at which data is actually delivered successfully
  4. 4. B · ICMP
  5. 5. A · Confidentiality, integrity and server authentication
  6. 6. B · The destination MAC address is not yet in its address table
  7. 7. C · A lost TCP segment delays all multiplexed streams until it is retransmitted
  8. 8. C · 12 kbit/s

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