Question Bank - Computer Networks

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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.What is the number of subnets inside the enterprise network?

A.
3
B.
12
C.
6
D.
8

Solution:

Option 3 is rightThe number of interfaces of routers is the number of subnets. Each interface has a different IP address and each IP address can be stored in a routing table with a different Subnet Mask.There are 7 interfaces where 1 interface is common between two routers. Hence, there are total of 6 subnets.

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