Module 1

• IT infrastructure 


  encompasses the software, the hardware, network, an services required for an organization to operate in an enterprise IT environment.
• System administrator 


  They work in the background to make sure a company's IT infrastructure is always working, constantly fighting to prevent IT disasters from happening.
• System administrator 


  The role of a sysadmin can vary depending on the size of an organization  
• System administrator 


  They are responsible for their company's I.T. services.
• A server is essentially software or a machine that provides services to other software or machines. 
• Clients request the services from a server and in turn, the servers respond with the services. 
• Server can provide services to multiple clients at once and the client can use multiple servers. 
• Any computer can be a server. 
• Canary Testing is a way to reduce risk and validate new software by releasing software to a small percentage of users.
• Virtualization is the process of creating a software-based or virtual representation of something, such as virtual applications, storage, and even networks. 
• An enterprise data center is a physical facility that houses an organization's routers, switches, servers, firewalls, and other components that enable critical applications and store and process data. 
• A tower server is a computer intended for use as a server and built in an upright cabinet that stands alone. 
• A blade server is a stripped-down server computer with a modular design optimized to minimize the use of physical space and energy.
• Rack servers which lay flat and are usually mounted in a 90” wide server rack.
• KVM stands for keyboard, video and mouse. 
• A KVM Switch looks like a hub that you can connect multiple computers to and control them using one keyboard, mouse and monitor.
• Cloud computing is the concept that you can access your data, use applications, store files, et cetera, from anywhere in the world as long as you have an internet connection. 
• In larger companies, teams assist admins might manage just one service
• In a smaller company, a single person could be responsible for all these services. 
• A data center is a facility that stores hundreds, if not thousands of servers. 
• A drawback of cloud computing is cost.
• A drawback of cloud computing is dependency.
• Documentation 


  If you're managing systems, you'll be responsible for documenting your company's policies, routine procedures, and more. 
• Documenting what you did is  crucial when using administrator rights. 
• Infrastructure services 


  Managing services doesn't just mean setting them up. They have to be updated routinely patches for security holes, and compatible with the computer with your  organization.
• Infrastructure services 


  As an IT support specialist doing system administration, you'd be responsible for the If infrastructure services in your organization
• Procurement 


  This is the stage where hardware is purchased or re-used for any employee.
• Deployment 


  This is where hardware is set up so  that the employee can do the job.
• Maintenance 


  This is the stage where software is updated and hardware issues are fixed if and when they occur.
• Retirement 


  In this final stage, hardware becomes unusable or no longer needed and it needs to be properly removed from the fleet.
• Routine Maintenance 


  it is constantly provide updates and maintenance so that they run the latest secure software.