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

Which IPv4 address is the standard loopback address of a host?

  1. A192.168.0.1
  2. B127.0.0.1
  3. C255.255.255.255
  4. D0.0.0.0
2.Easy

What is the main job of a firewall?

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

What is the broadcast address of the network 192.168.1.0/24?

  1. A255.255.255.0
  2. B192.168.1.255
  3. C192.168.1.1
  4. D192.168.1.0
4.Medium

What is a cyclic redundancy check (CRC) used for in Ethernet frames?

  1. AEncrypting the frame
  2. BCorrecting every bit error automatically
  3. CChoosing the best route
  4. DDetecting transmission errors
5.Medium

Which DNS record type maps a host name to an IPv6 address?

  1. AA
  2. BMX
  3. CAAAA
  4. DCNAME
6.Medium

Which medium access method did classic shared (half-duplex) Ethernet use?

  1. AToken passing
  2. BCSMA/CA
  3. CCSMA/CD
  4. DTDMA
7.Hard

A user can ping 8.8.8.8 but cannot open any website by name. Where is the problem most likely?

  1. AThe default gateway
  2. BName resolution (DNS)
  3. CThe physical cable
  4. DThe network card driver
8.Hard

Why does a browser warn when a site presents a self-signed certificate?

  1. ASelf-signed certificates use no encryption at all, so the traffic is sent in clear text
  2. BThe site must be using HTTP instead of HTTPS
  3. CThe certificate is always expired
  4. DNo trusted certificate authority vouches that the key belongs to that site

Answer key

  1. 1. B · 127.0.0.1
  2. 2. A · To allow or block traffic according to security rules
  3. 3. B · 192.168.1.255
  4. 4. D · Detecting transmission errors
  5. 5. C · AAAA
  6. 6. C · CSMA/CD
  7. 7. B · Name resolution (DNS)
  8. 8. D · No trusted certificate authority vouches that the key belongs to that site

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