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 does a packet header mainly contain?

  1. AControl information such as source and destination addresses
  2. BThe cable type used for the link
  3. CThe website's text and images
  4. DThe user's actual file contents, split into equal-sized pieces
2.Easy

Which application protocol transfers files using separate control and data connections?

  1. AHTTP
  2. BDNS
  3. CFTP
  4. DSMTP
3.Easy

Which IEEE standard family defines wired Ethernet?

  1. AIEEE 802.5
  2. BIEEE 802.11
  3. CIEEE 802.3
  4. DIEEE 802.16
4.Medium

Which of these is a private IPv4 address range?

  1. A200.1.1.0/24
  2. B100.0.0.0/8
  3. C192.168.0.0/16
  4. D8.8.8.0/24
5.Medium

How many usable host addresses does a /26 IPv4 subnet have?

  1. A64
  2. B62
  3. C30
  4. D126
6.Medium

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

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

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

  1. APath MTU discovery fails because "fragmentation needed" messages are blocked
  2. BTLS certificates are sent over ICMP
  3. CDNS needs ICMP to resolve names
  4. DTCP cannot open connections without ICMP
8.Hard

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

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

Answer key

  1. 1. A · Control information such as source and destination addresses
  2. 2. C · FTP
  3. 3. C · IEEE 802.3
  4. 4. C · 192.168.0.0/16
  5. 5. B · 62
  6. 6. B · It is the router used for traffic to other networks
  7. 7. A · Path MTU discovery fails because "fragmentation needed" messages are blocked
  8. 8. B · The server's table of half-open connections

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