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

In networking, what does bandwidth usually refer to?

  1. AThe maximum data rate a link can carry
  2. BThe share of packets that are lost
  3. CThe delay before data arrives
  4. DThe number of hops to a destination
2.Easy

Which command shows the routers a packet passes through on its way to a destination?

  1. Anslookup
  2. Btraceroute (tracert on Windows)
  3. Cipconfig
  4. Dnetstat
3.Easy

Which IEEE standard family defines wired Ethernet?

  1. AIEEE 802.5
  2. BIEEE 802.3
  3. CIEEE 802.11
  4. DIEEE 802.16
4.Medium

A signal travels 2000 km through fibre at about 2 × 10⁸ m/s. What is the propagation delay?

  1. A1 ms
  2. B10 ms
  3. C100 ms
  4. D0.1 ms
5.Medium

What does an MX record in DNS specify?

  1. AAn alias name for another host
  2. BThe mail servers that accept email for a domain
  3. CThe IPv4 address of a web server
  4. DThe name servers for a zone
6.Medium

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

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

What does the Diffie-Hellman key exchange achieve on its own, and what is its weakness?

  1. AIt agrees a shared secret over a public channel, but alone it is open to a man-in-the-middle
  2. BIt authenticates both users with passwords, but needs a central server
  3. CIt signs certificates for websites, but only works with short keys
  4. DIt encrypts bulk data directly over a public channel, but it is far too slow for large files and video
8.Hard

A TCP connection has a 64 KB window and a 100 ms round-trip time, and no window scaling. What is its approximate maximum throughput?

  1. AAbout 640 Mbit/s
  2. BAbout 50 Mbit/s
  3. CAbout 0.5 Mbit/s
  4. DAbout 5 Mbit/s

Answer key

  1. 1. A · The maximum data rate a link can carry
  2. 2. B · traceroute (tracert on Windows)
  3. 3. B · IEEE 802.3
  4. 4. B · 10 ms
  5. 5. B · The mail servers that accept email for a domain
  6. 6. D · The destination MAC address is not yet in its address table
  7. 7. A · It agrees a shared secret over a public channel, but alone it is open to a man-in-the-middle
  8. 8. D · About 5 Mbit/s

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