What are three reasons that switches replaced bridges? (Choose three.)
A. Smaller frame buffers increase speed.
B. Forward, filter, or flood frames based in hardware.
C. Multiple simultaneous communications between ports.
D. Larger inspection engine allows for higher throughput.
E. Switches have many ports.
Answer: B, C and E.
Switches and bridges in function are basically the same. They forward traffic based on layer 2 addressing (MAC addresses), relative to the ingress port and the egress port based on the destination address. If the address is not known, it’s a broadcast or an unregistered multicast, is flooded out all ports. The primary difference is that all modern switches make forwarding decisions in hardware (on Cisco switches, ASICs (application specific integrated circuits…in other words a purpose built CPU for that one or limited function). Using hardware based forwarding gives us speed, reduced latency, the appearance (and sometimes actual) concurrent conversations and much higher port density.
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