Repeaters work at which layer of the OSI model?

A.) Network

B.) Session

C.) Transport

D.) Physical

Answer Posted / r. hatman

Physical (L1), because if it would work at Network layer,
then it would in effect be a Router.

From software/firmware perspective I would guess that
typically device which is configured (or is limited just) to
be a Repeater, will forward anything it receives from L1
receive (callback) function to the L1 send function. This
can also be a loop back built into the L1 module or
technically L1 module can be without it and data is looped
back at some higher layer but in effect this is still a L1
function. Often this has to be implemented as a
"store-and-forward" system, since you cannot often both send
and receive to same media at the same time.

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