1. Computer Science
2. Hardware
3. 28461

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A seven-story office building has 15 adjacent offices per floor. Each office contains a wall socket for a terminal in the front wall, so the sockets form a rectangular grid in the vertical plane, with a separation of 4 meters between sockets, both horizontally and vertically. Assuming that it is feasible to run a straight cable between any pair of sockets (horizontally, vertically, or diagonally), how many meters of cable are needed to connect all sockets using
a. A star configuration with a single router in the middle?
b. An 802.3 LAN (on a single cable)?

Please explain all work.