You have been asked to help upgrade the LAN at a very successful CPA firm with five departments in one building and a total of 560 employees. Although the firm's employees understand accounting, they haven't spent much time improving their network. Currently, it runs 10Base-T Ethernet and relies on 35 hubs to connect every user workstation to the network. Most of these workstations were purchased within the past two years, when the firm experienced a growth spurt. The hubs are connected to the backbone via switches. The CPA firm wants to upgrade its LAN, but not at great cost. It also wants to ensure that it can easily expand its LAN in the future. It has already decided to use a version of Linux as its network operating system. What kind of LAN will you design for this company? Describe its physical layer standard this access method should rely on. What types of infrastructure upgrades are necessary to implement your suggested network?