The technologies involved in communication tend to be complex. You certainly don't need to understand them for your ICT course. However, there are aspects of digital communications that you needs to be aware of. These relate primarily to the two types of network and the ways of connecting to the internet.
Archaeans include inhabitants of some of the most extreme environments on the planet. Some live near rift vents in the deep sea at temperatures well over 100 degrees Centigrade. Others live in hot springs (such as the ones pictured above), or in extremely alkaline or acid waters.
They reproduce asexually, but do not produce spores as seen in eubacteria. Eubacteria or true bacteria evolved independently from Archaea from an ancient common ancestor. They... Archaea are very primitive prokaryotic cells that live in extreme habitats such as hot springs, extremely salty areas, etc. However, they have a much broader range of habitats than previously believed and play a role in the carbon and nitrogen cycles. They have no nucleus or membrane bound organelles. They reproduce asexually, but do not produce spores as seen in eubacteria. Eubacteria or true bacteria evolved independently from Archaea from an ancient common ancestor. They are involved in processes such as decompositon, the nitrogen cycle, make up a huge amount of biomass on Earth, allow for fermentation of foods like cheese and wine, cause diseases and live in and on other organisms.