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

Which IEEE standard family defines Wi-Fi wireless LANs?

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

In which network topology is every device connected to one central switch or hub?

  1. ARing
  2. BStar
  3. CFull mesh
  4. DBus
3.Easy

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

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

At which OSI layer does a switch normally operate?

  1. ANetwork (layer 3)
  2. BTransport (layer 4)
  3. CData link (layer 2)
  4. DPhysical (layer 1)
5.Medium

How does a stateful firewall differ from a simple packet filter?

  1. AIt tracks connections and allows replies that belong to established sessions
  2. BIt encrypts every packet it forwards
  3. CIt only checks the MAC address of each frame
  4. DIt blocks all incoming traffic without exceptions, including replies to outgoing requests
6.Medium

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

  1. A64
  2. B126
  3. C62
  4. D30
7.Hard

Why does IPv6 not need NAT for address shortage?

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

What does TCP fast retransmit do?

  1. AResends every segment twice to be safe
  2. BDoubles the window after every loss
  3. CSkips the three-way handshake when reconnecting to known hosts, so data is resent sooner
  4. DResends a segment after three duplicate ACKs, without waiting for the timeout

Answer key

  1. 1. C · IEEE 802.11
  2. 2. B · Star
  3. 3. C · A router
  4. 4. C · Data link (layer 2)
  5. 5. A · It tracks connections and allows replies that belong to established sessions
  6. 6. C · 62
  7. 7. C · Its 128-bit address space is large enough to give every device a global address
  8. 8. D · Resends a segment after three duplicate ACKs, without waiting for the timeout

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