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 protocol gives secure, encrypted remote login to another computer?

  1. ASNMP
  2. BTelnet
  3. CSSH
  4. DFTP
2.Easy

What is the name of the data unit at the data link layer?

  1. ASegment
  2. BMessage
  3. CFrame
  4. DPacket
3.Easy

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

  1. Atraceroute (tracert on Windows)
  2. Bnslookup
  3. Cnetstat
  4. Dipconfig
4.Medium

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

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

Which metric does RIP use to choose routes?

  1. AHop count
  2. BMeasured delay
  3. CLink bandwidth
  4. DBusiness policy
6.Medium

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

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

Stations A and C both reach access point B but cannot hear each other, so their frames collide at B. How does 802.11 help?

  1. ABy routing A's frames through C
  2. BBy making A and C use collision detection so they stop sending when frames overlap
  3. COptional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait
  4. DBy increasing the TTL of the frames
8.Hard

How does fragmentation differ in IPv6 compared with IPv4?

  1. ARouters never fragment IPv6 packets; only the source can, using path MTU discovery
  2. BIPv6 fragments at the transport layer inside TCP
  3. CIPv6 does not allow packets larger than 576 bytes
  4. DIPv6 routers fragment every packet larger than 64 bytes before forwarding it on the path

Answer key

  1. 1. C · SSH
  2. 2. C · Frame
  3. 3. A · traceroute (tracert on Windows)
  4. 4. A · 192.168.0.0/23
  5. 5. A · Hop count
  6. 6. C · It tracks connections and allows replies that belong to established sessions
  7. 7. C · Optional RTS/CTS exchanges: the AP's CTS tells all nearby stations to wait
  8. 8. A · Routers never fragment IPv6 packets; only the source can, using path MTU discovery

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