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 throughput?

  1. AThe time a packet takes to cross a link
  2. BThe number of routers on a path
  3. CThe rate at which data is actually delivered successfully
  4. DThe theoretical maximum rate a link can carry under ideal conditions
2.Easy

What is the default port number for SSH?

  1. A22
  2. B23
  3. C53
  4. D110
3.Easy

What is the default port number for HTTPS?

  1. A21
  2. B25
  3. C80
  4. D443
4.Medium

What uniquely identifies one end of a TCP connection on the internet?

  1. AA MAC address alone
  2. BA domain name alone
  3. CA subnet mask and gateway
  4. DAn IP address together with a port number
5.Medium

What is the network address of the host 192.168.10.77/26?

  1. A192.168.10.76
  2. B192.168.10.0
  3. C192.168.10.64
  4. D192.168.10.128
6.Medium

Which subnet mask corresponds to /20?

  1. A255.255.255.240
  2. B255.255.248.0
  3. C255.255.224.0
  4. D255.255.240.0
7.Hard

In a TCP connection, what does the receive window (rwnd) control?

  1. AThe retransmission time-out, calculated from the measured round-trip time of each segment
  2. BHow much unacknowledged data the sender may send, based on the receiver's buffer
  3. CThe size of each IP packet header
  4. DThe number of open ports
8.Hard

How does a content delivery network (CDN) mainly improve web performance?

  1. AIt removes the need for DNS lookups
  2. BIt increases the bandwidth of the users' own home connections
  3. CIt serves cached content from servers close to the users
  4. DIt replaces TCP with a faster transport protocol

Answer key

  1. 1. C · The rate at which data is actually delivered successfully
  2. 2. A · 22
  3. 3. D · 443
  4. 4. D · An IP address together with a port number
  5. 5. C · 192.168.10.64
  6. 6. D · 255.255.240.0
  7. 7. B · How much unacknowledged data the sender may send, based on the receiver's buffer
  8. 8. C · It serves cached content from servers close to the users

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