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 VPN mainly provide?

  1. AA free public IP address for every device
  2. BAn encrypted tunnel across an untrusted network such as the internet
  3. CA faster physical connection to the internet through a dedicated line
  4. DAutomatic backup of files to a server
2.Easy

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

  1. ASMTP
  2. BHTTP
  3. CFTP
  4. DDNS
3.Easy

What is the default port number for DNS?

  1. A67
  2. B161
  3. C53
  4. D80
4.Medium

Which of these is a private IPv4 address range?

  1. A8.8.8.0/24
  2. B200.1.1.0/24
  3. C192.168.0.0/16
  4. D100.0.0.0/8
5.Medium

What is the usual order of messages when a client obtains an address from DHCP?

  1. ARequest, Offer, Discover, Acknowledge
  2. BDiscover, Offer, Request, Acknowledge
  3. COffer, Discover, Acknowledge, Request
  4. DDiscover, Request, Offer, Acknowledge
6.Medium

A router has routes for 10.0.0.0/8 and 10.1.0.0/16. Which route does it use for a packet to 10.1.5.5?

  1. A10.0.0.0/8, because it was added first
  2. B10.1.0.0/16, because it is the longest matching prefix
  3. CBoth routes, splitting the traffic equally
  4. D10.0.0.0/8, because it covers more addresses than the /16
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. BThe number of open ports
  3. CHow much unacknowledged data the sender may send, based on the receiver's buffer
  4. DThe size of each IP packet header
8.Hard

Which routing protocol is a link-state protocol?

  1. ABGP
  2. BOSPF
  3. CARP
  4. DRIP

Answer key

  1. 1. B · An encrypted tunnel across an untrusted network such as the internet
  2. 2. C · FTP
  3. 3. C · 53
  4. 4. C · 192.168.0.0/16
  5. 5. B · Discover, Offer, Request, Acknowledge
  6. 6. B · 10.1.0.0/16, because it is the longest matching prefix
  7. 7. C · How much unacknowledged data the sender may send, based on the receiver's buffer
  8. 8. B · OSPF

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