Networking Exam drill

Count the Domains: Classic Exam Question

This domain-counting question costs students marks every year

Lesson notes

Key points

Remember that routers break up broadcast domains, but switches do not.
Each router interface starts its own broadcast domain.
The router has two connected interfaces, so there are two broadcast domains.
Switches only separate collision domains, one per switch port.

Takeaway: Routers split broadcast domains; switches split collision domains.

Quick check: A router has two interfaces, each connected to a switch with 4 PCs. How many broadcast domains are there?

1
2
10

State the rule: one broadcast domain per router interface (or VLAN), then count.

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