If a router has four interfaces and each interface is connected to four switches, how many broadcast domains are present on the router?

A router creates a separate broadcast domain for each of its interfaces. This is a fundamental characteristic of routers, as they do not forward broadcast messages between interfaces.

In this scenario, the router has four interfaces, and each interface is connected to four switches. However, it is important to note that the number of switches connected to the interfaces does not influence the count of the broadcast domains created by the router. Each interface contributes one distinct broadcast domain regardless of the number of switches connected to it.

Consequently, since there are four interfaces on the router, there are four separate broadcast domains. This means any broadcast sent on one interface will not be received by devices connected to the other interfaces. Therefore, the total number of broadcast domains present on the router is four.