2. Six stations (S1-56) are connected to an extended LAN through transparent bridges (B1, B2 and B3), as shown below. Initially, the forwarding tables are empty. Suppose the following stations transmit frames: S1 transmits to S5, S3 transmits to S1, S4 transmits to S3, S5 transmits to S2, S2 transmits to S5 and S3 transmits to S2. Explain the steps involved in bridge learning and fill up the forwarding tables with appropriate entries after the frames have been completely transmitted.(HINT: Port 4 and Port 6 are blocked port) 51 S2 WA LAN1 1 3 5 LAN3 7 B1 B2 B3 S5 2 4 6 LAN2 S3 S4