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 broadcast address of the network 192.168.1.0/24?

  1. A192.168.1.0
  2. B192.168.1.255
  3. C192.168.1.1
  4. D255.255.255.0
2.Easy

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

  1. ABus
  2. BFull mesh
  3. CStar
  4. DRing
3.Easy

In the client-server model:

  1. AClients send requests and a server provides the service
  2. BEvery computer stores the whole internet
  3. CAll devices must be in the same room
  4. DServers send requests and clients answer them
4.Medium

Which protocol does the "ping" command use?

  1. AHTTP
  2. BICMP
  3. CTCP
  4. DUDP
5.Medium

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

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

Which subnet mask corresponds to /20?

  1. A255.255.255.240
  2. B255.255.248.0
  3. C255.255.240.0
  4. D255.255.224.0
7.Hard

A firewall blocks all ICMP. Small web requests work, but large downloads over some paths hang. What is the likely cause?

  1. APath MTU discovery fails because "fragmentation needed" messages are blocked
  2. BTCP cannot open connections without ICMP
  3. CDNS needs ICMP to resolve names
  4. DTLS certificates are sent over ICMP
8.Hard

A PC can reach printers on its own subnet but nothing beyond it. Its IP address and mask are correct. What is the most likely fault?

  1. AA missing or wrong default gateway
  2. BA faulty DNS server setting
  3. CThe TCP window is too small
  4. DA duplicate MAC address on the internet

Answer key

  1. 1. B · 192.168.1.255
  2. 2. C · Star
  3. 3. A · Clients send requests and a server provides the service
  4. 4. B · ICMP
  5. 5. A · The destination MAC address is not yet in its address table
  6. 6. C · 255.255.240.0
  7. 7. A · Path MTU discovery fails because "fragmentation needed" messages are blocked
  8. 8. A · A missing or wrong default gateway

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