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 type of network covers a large geographic area, such as a whole country?

  1. AA wide area network (WAN)
  2. BA local area network (LAN)
  3. CA personal area network (PAN)
  4. DA virtual LAN (VLAN)
2.Easy

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

  1. AFTP
  2. BSNMP
  3. CTelnet
  4. DSSH
3.Easy

Which application protocol is used to request web pages from a web server?

  1. AARP
  2. BSMTP
  3. CSNMP
  4. DHTTP
4.Medium

How long does it take to put a 1500-byte packet onto a 12 Mbit/s link (transmission delay)?

  1. A1 ms
  2. B12 ms
  3. C0.125 ms
  4. D8 ms
5.Medium

What is the purpose of the TCP three-way handshake?

  1. ATo close a connection quickly
  2. BTo find the IP address of a host before data can be sent to it
  3. CTo encrypt the data
  4. DTo establish a connection and synchronise sequence numbers
6.Medium

Which range of TCP/UDP port numbers is reserved as "well-known" ports?

  1. A0–1023
  2. B49152–65535
  3. C0–65535
  4. D1024–49151
7.Hard

After repeated collisions, classic Ethernet stations choose their waiting time from a range that doubles each time. Why?

  1. ATo give the station with the highest MAC address priority on the shared cable
  2. BTo lower the chance of colliding again when many stations compete
  3. CTo synchronise all stations to one clock
  4. DTo make the cable carry signals further
8.Hard

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

  1. ADNS needs ICMP to resolve names
  2. BTCP cannot open connections without ICMP
  3. CTLS certificates are sent over ICMP
  4. DPath MTU discovery fails because "fragmentation needed" messages are blocked

Answer key

  1. 1. A · A wide area network (WAN)
  2. 2. D · SSH
  3. 3. D · HTTP
  4. 4. A · 1 ms
  5. 5. D · To establish a connection and synchronise sequence numbers
  6. 6. A · 0–1023
  7. 7. B · To lower the chance of colliding again when many stations compete
  8. 8. D · Path MTU discovery fails because "fragmentation needed" messages are blocked

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