200-150 · Question #102
What are three reasons that switches supersede bridges? (Choose three.)
The correct answer is B. Forward, filter, or flood frames. C. Multiple simultaneous communications between ports. E. Switches have many ports.. Switches superseded bridges primarily because they support many more ports, allow concurrent port-to-port conversations, and retain the same frame forwarding logic. Bridges were limited in port density and throughput.
Question
What are three reasons that switches supersede bridges? (Choose three.)
Options
- ASmaller frame buffers decrease latency.
- BForward, filter, or flood frames.
- CMultiple simultaneous communications between ports.
- DLarger inspection engine allows for higher throughput.
- ESwitches have many ports.
How the community answered
(27 responses)- A4% (1)
- B93% (25)
- D4% (1)
Why each option
Switches superseded bridges primarily because they support many more ports, allow concurrent port-to-port conversations, and retain the same frame forwarding logic. Bridges were limited in port density and throughput.
This is incorrect on two counts - switches have larger frame buffers than bridges, not smaller, and smaller buffers would increase latency by causing more drops, not decrease it.
Switches perform the same Layer 2 logic as bridges - forwarding known unicast frames, filtering frames whose source and destination are on the same port, and flooding unknown or broadcast frames - but do so in hardware at much higher speeds.
Each switch port is its own collision domain and can operate in full-duplex, enabling multiple pairs of ports to exchange frames simultaneously, whereas a bridge with few ports serializes traffic across segments.
Switches do not use a larger software inspection engine; instead they use ASICs (Application-Specific Integrated Circuits) for hardware-based wire-speed switching, which is the actual reason for higher throughput.
Switches are manufactured with many ports (24, 48, or more), allowing large numbers of devices to connect directly, while bridges typically had only 2 to 4 ports.
Concept tested: Advantages of switches over bridges
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst_macro_view/sw_admn_gd/swadmn.html
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