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 name of the data unit at the data link layer?

  1. AFrame
  2. BMessage
  3. CSegment
  4. DPacket
2.Easy

What is the main job of a firewall?

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

How is an IPv6 address usually written?

  1. ASix pairs of hexadecimal digits separated by dashes or colons
  2. BFour decimal numbers separated by dots
  3. CEight groups of four hexadecimal digits separated by colons
  4. DSixteen decimal numbers separated by dots
4.Medium

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

  1. ACNAME
  2. BAAAA
  3. CA
  4. DMX
5.Medium

A browser receives HTTP status code 404. What does it mean?

  1. AThe server had an internal error
  2. BThe client must log in first
  3. CThe request succeeded
  4. DThe requested resource was not found
6.Medium

What does an MX record in DNS specify?

  1. AThe IPv4 address of a web server
  2. BThe mail servers that accept email for a domain
  3. CAn alias name for another host
  4. DThe name servers for a zone
7.Hard

In a SYN flood attack, what resource is the attacker trying to exhaust?

  1. AThe server's disk space
  2. BThe DNS cache of the client
  3. CThe switch's MAC address table
  4. DThe server's table of half-open connections
8.Hard

How does fragmentation differ in IPv6 compared with IPv4?

  1. AIPv6 routers fragment every packet larger than 64 bytes before forwarding it on the path
  2. BIPv6 does not allow packets larger than 576 bytes
  3. CIPv6 fragments at the transport layer inside TCP
  4. DRouters never fragment IPv6 packets; only the source can, using path MTU discovery

Answer key

  1. 1. A · Frame
  2. 2. C · To allow or block traffic according to security rules
  3. 3. C · Eight groups of four hexadecimal digits separated by colons
  4. 4. B · AAAA
  5. 5. D · The requested resource was not found
  6. 6. B · The mail servers that accept email for a domain
  7. 7. D · The server's table of half-open connections
  8. 8. D · Routers never fragment IPv6 packets; only the source can, using path MTU discovery

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