4. Consider the layer-2 network composed of 6 Ethernet switches depicted in the figure below. The switches are running the Spanning Tree Protocol (STP) as described in the course. All links have a cost of 1. When equal-cost paths to the root are encountered, switches break the tie based on the sender ID (lower is better). 5 6 1 2 3 4 a. (2 points) Which links (use the format [s1, s2]) will end up deactivated in the steady state, once all the switches have converged on the final spanning tree? Which switch is the root?