$5$A$)$

Figure: Q$5$A

Compute the forwarding table for Bridge $1,2,3($assuming the forwarding tables are empty initially$)$

with appropriate entries after the following frames are completely transferred as given below.

S $1$ transmit to S $2,$ S$3$ transmit to $S4,S1$ transmit to S $3$

S $2$ transmit to $S4,S2$ transmit to $S3,S1$ transmit to S $4.$

$5$B$)$ Identify the mechanism of Amplitude modulation in detail.

$5$C$)$ Demonstrate the working of Longitudinal Redundancy Check taking suitable example.