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Transmission data rate is decided by ____________(a) network layer(b) physical layer(c) data link layer(d) transport layerI got this question during a job interview.My doubt is from Reference Models in section Computer Networks Introduction of Computer Network

Answer»

Correct option is (b) physical layer

The BEST explanation: Physical layer is a layer 1 device which DEALS with NETWORK cables or the standards in use like connectors, pins, electric current USED etc. Basically the transmission speed is determined by the cables and connectors used. Hence it is physical layer that determines the transmission speed in network. Some of the cables used for high speed data transmission are optical fiber cables and twisted pair cables.



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