How many bridges can be added to a router?

• A. One
• B. Unlimited
• C. Two
• D. Three

Answer: (B)

Bridges in RouterOS are software switches that forward frames between all the interfaces you assign as their members. You can create as many bridges as you need—there isn’t a fixed limit built into the OS. The practical constraint is the device’s resources: each bridge maintains its own MAC address table and, if enabled, spanning-tree data, so having many bridges or large port counts uses more memory and CPU. Also note that an interface can belong to only one bridge at a time, so to create separate bridging domains you’d use different interfaces (or VLAN subinterfaces) attached to different bridges. In short, you can add an unlimited number of bridges in theory; real-world limits come from hardware resources.