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

What is the main job of a firewall?

  1. ATo speed up downloads by caching files
  2. BTo allow or block traffic according to security rules
  3. CTo assign IP addresses to hosts
  4. DTo convert domain names into addresses
2.Easy

Which protocol lets an email client read mail while keeping messages and folders on the server?

  1. ASNMP
  2. BIMAP
  3. CSMTP
  4. DDHCP
3.Easy

Which protocol gives secure, encrypted remote login to another computer?

  1. ATelnet
  2. BSSH
  3. CSNMP
  4. DFTP
4.Medium

At which OSI layer does a switch normally operate?

  1. AData link (layer 2)
  2. BPhysical (layer 1)
  3. CTransport (layer 4)
  4. DNetwork (layer 3)
5.Medium

What is the main purpose of a VLAN?

  1. ATo increase the speed of every switch port
  2. BTo split one physical switched network into separate broadcast domains
  3. CTo give each device a public IP address
  4. DTo encrypt all traffic between switches so other departments cannot read it
6.Medium

What uniquely identifies one end of a TCP connection on the internet?

  1. AAn IP address together with a port number
  2. BA subnet mask and gateway
  3. CA MAC address alone
  4. DA domain name alone
7.Hard

Why does TCP choose an unpredictable initial sequence number for each connection?

  1. ATo compress the data more efficiently
  2. BTo select the best route to the destination for the segments of that connection
  3. CTo avoid confusion with old segments and make spoofed segments harder to inject
  4. DTo encrypt the payload of each segment
8.Hard

Hosts in VLAN 10 and VLAN 20 on the same switch cannot communicate. What is needed?

  1. AA hub connected to both VLANs
  2. BA longer cable between the hosts
  3. CThe same MAC address on both hosts
  4. DA router or layer 3 switch to route between the VLANs

Answer key

  1. 1. B · To allow or block traffic according to security rules
  2. 2. B · IMAP
  3. 3. B · SSH
  4. 4. A · Data link (layer 2)
  5. 5. B · To split one physical switched network into separate broadcast domains
  6. 6. A · An IP address together with a port number
  7. 7. C · To avoid confusion with old segments and make spoofed segments harder to inject
  8. 8. D · A router or layer 3 switch to route between the VLANs

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