ElysianEcho Gaming $($EEG$)$ is a leading e$-$gaming company in Malaysia. EEG utilises cutting$-$edge technology to provide immersive e$-$gaming experiences for its players. As a leading e$-$game company, they pride themselves in delivering high$-$quality and engaging digital entertainment services to gamers nationwide. At the heart of EEG operations is a state$-$of$-$the$-$art cloud$-$based infrastructure. They utilise eight data centres strategically distributed throughout Malaysia to ensure optimal performance, reliability and scalability for their gaming platforms. This distributed approach minimises latency, providing gamers with seamless and responsive experiences.

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

$$ Describe THREE aspects of the EXISTING HQ$$s network infrastructure in Selangor $($minimum FIVE 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

$$ Describe THREE aspects of the EXISTING data centre $($only ONE data centre to be discussed$)$