(20 points) Consider the virtual circuit tables for Switch S1, Switch S2, Switch S3, and the corresponding network shown below. 2. Explain the semantics of the second entry 1 1 2 3 of Switch S1. List all endpoint-to-endpoint connections. a. b. Switch S1 Switch S2 Switch S3 Port VCI Por VCI Port VCI Por VCI Port VCI Port VCI (20 points) Consider the virtual circuit tables for Switch S1, Switch S2, Switch S3, and the corresponding network shown below. 2. Explain the semantics of the second entry 1 1 2 3 of Switch S1. List all endpoint-to-endpoint connections. a. b. Switch S1 Switch S2 Switch S3 Port VCI Por VCI Port VCI Por VCI Port VCI Port VCI