A link$-$layer switch in the network topology below has the following switching table:

The switch receives the following frame on Port $1..$ What has likely occurred?

ff ff ff ff ff ff $642$B $1345652008004500$

$00284$b b$7400080066$f c$280$ e$24$a $90$ c$0$ a$8$

$01020050$ ce c$50$a $1978$ ac $617498$ a$95010$