Suppose virtual circuit forwarding is used for the same network as shown above with the forwarding tables shown below. Also assume for a given link and a given direction, whenever a new virtual circuit is set up through the link, the smallest unused (on the given link and direction) virtual circuit identifier is selected. Indicate how the routing tables are modified after the following two changes. (i) First the circuit beginning with (port, VCI) = (0, 0) at switch S1 is torn down. (ii) Subsequently, a new circuit is set up from host D to host B using a least-cost path.

112 0 0 S1 S2 S3 OUT 2 S4 P010 3-p 330 p2220 P0100 p003 p00-12 V000 | 0 | 0 | 2 | 1 | 0 2 P 23111 P00-20 p001 p02223 112 0 0 S1 S2 S3 OUT 2 S4 P010 3-p 330 p2220 P0100 p003 p00-12 V000 | 0 | 0 | 2 | 1 | 0 2 P 23111 P00-20 p001 p02223