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Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below.

A firewall links to the Internet, to a router below it and to a top router; the top router links to a web server and to a third router; the lower-left and right routers each serve an Ethernet segment of computers

What is the number of subnets inside the enterprise network?

  • A.3
  • B.12
  • C.6
  • D.8

Answer: C

There are 6 subnets.

Each router or firewall interface sits on its own subnet, so every separate link or segment between these devices is one subnet. Counting them in the figure:

  1. firewall to the lower-left router;
  2. firewall to the top router;
  3. top router to the web server;
  4. top router to the right router;
  5. the lower-left router's Ethernet segment;
  6. the right router's Ethernet segment.

The firewall's link to the Internet is outside the enterprise network, so it is not counted. 3 counts only the routers, 8 and 12 count interfaces or hosts rather than shared links.

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