Crisis Guard Technologies $($CGT$)$ is a premier disaster recovery site provider in Malaysia. CGT leverages advanced technology to deliver robust and secure disaster recovery solutions for businesses across the nation. As a leading provider in the industry, they take pride in offering reliable and efficient services that ensure business continuity during unexpected disruptions. At the core of CGT$\text{'}$s operations is a state$-$of$-$the$-$art, cloud$-$based disaster recovery infrastructure. They operate multiple recovery sites strategically located throughout Malaysia to guarantee rapid response, reliability, and scalability for their clients. This distributed approach minimises downtime, providing businesses with peace of mind and ensuring uninterrupted operations even in the face of disaster.

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Due to its successful disaster recovery solutions, a huge number of demands have been coming from clients in the other TEN South East Asia countries. The management of CGT has decided to expand its service in Malaysia to reach up to the TEN South East Asia countries. As the Senior Network Engineer in CGT$,$ you are tasked with upgrading the existing network infrastructure for CGT$.$

$$ Describe THREE aspects of the EXISTING HQ$$s network infrastructure in Selangor $($TEN floors$).$ Examples of these aspects are $($but not restricted to$)$:

a$.$ Topologies $($e$.$g$.$ bus, star, ring$)$ used with scenarios explanation

b$.$ Networking devices $($e$.$g$.$ bridge, switch, AP$,$ router, gateway$)$ used with scenarios explanation

c$.$ Communication media $($e$.$g$.$ coaxial cable, UTP, STP$,$ fibre optics, WiFi$)$ used with scenarios explanation