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 protocol is used to send email between mail servers?

  1. APOP3
  2. BSNMP
  3. CIMAP
  4. DSMTP
2.Easy

What does DNS do?

  1. ARoutes packets between networks
  2. BAssigns IP addresses to devices automatically
  3. CTranslates domain names into IP addresses
  4. DEncrypts web traffic
3.Easy

What is the default port number for HTTPS?

  1. A443
  2. B80
  3. C25
  4. D21
4.Medium

What is the role of a default gateway on a host?

  1. AIt is the switch port the host is connected to
  2. BIt assigns MAC addresses
  3. CIt is the DNS server
  4. DIt is the router used for traffic to other networks
5.Medium

Which of these is a private IPv4 address range?

  1. A192.168.0.0/16
  2. B200.1.1.0/24
  3. C8.8.8.0/24
  4. D100.0.0.0/8
6.Medium

NAT (network address translation) is mainly used to:

  1. ALet many devices with private addresses share one public IP address
  2. BIncrease the speed of a network cable
  3. CTranslate domain names into IP addresses for devices on a local network
  4. DEncrypt traffic between two sites
7.Hard

A remote-terminal application feels sluggish because small keystroke packets are held back. Which TCP mechanism is often responsible?

  1. AFast retransmit
  2. BThe three-way handshake
  3. CSlow start
  4. DNagle's algorithm
8.Hard

A DNS cache poisoning attack aims to:

  1. AMake a resolver store a false IP address for a domain
  2. BDelete DNS servers
  3. CSteal Wi-Fi passwords
  4. DOverload a server with traffic so that it stops answering queries

Answer key

  1. 1. D · SMTP
  2. 2. C · Translates domain names into IP addresses
  3. 3. A · 443
  4. 4. D · It is the router used for traffic to other networks
  5. 5. A · 192.168.0.0/16
  6. 6. A · Let many devices with private addresses share one public IP address
  7. 7. D · Nagle's algorithm
  8. 8. A · Make a resolver store a false IP address for a domain

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