GATE CS 2022 Set 1 — Question 22
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Computer Networks → Network Layer: Addressing → Subnetting & CIDR
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Question
Consider an enterprise network with two Ethernet segments, a web server and a firewall, connected via three routers as shown below.
What is the number of subnets inside the enterprise network?
Correct answer
(C) 6
Solution
Each router interface (and the firewall's inside interfaces) sits on its own IP subnet; a subnet is one link or one broadcast segment bounded by routers/firewall. Reading the figure:
1.Firewall – left router link.
2.Firewall – top router link.
3.Top router – web server link.
4.Top router – right router link.
5.Left router – left Ethernet segment (with its hosts).
6.Right router – right Ethernet segment (with its hosts).
The firewall's link "To Internet" is outside the enterprise network and is not counted.So there are subnets inside the enterprise network. (3 counts only the routers, 12 and 8 do not correspond to any division of the links.)Answer: (C) 6Continue learning with Success Tracker
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