First users were the engineers who built and programmed computers, then employees who had received specialized training were users, and now today, anyone and everyone can be a user. Evolution of Users Sends files over the network at the request of clients. Responds over LAN, within one location/site. Support both application software and data files. FILE SERVER Turns a user-friendly domain name, like Google.com, into an Internet Protocol (IP) address like ((( 70.42.251.42 ))) that computers use to identify each other on the network. Domain Name Server (DNS) Uses TWO KEYS a public and private key for performing encryption and decryption Public Key Encryption PROVING you are who you say you are which can be done by: what you know, what you have. Authentication TIER WHERE THE USER interface for the system is developed; SHIELDS THE USER from the underlying logic of the systems as well as the underlying data structures. Presentation tier SYSTEMS DEPLOYMENT Steps 1. System Conversion 2. Final Documentation 3. End User Training System Deployment CONNECTS MULTIPLES networks together; can be used to directly connect computers to a network; will relay messages to computers with APPROPRIATE IP ADDRESS Router Requires that data is KEPT secure so that they are not accidentally provided or obtained by unauthorized users Confidentiality Protecting EVERY LAYER that SURROUNDS ((( DATA ))) Defense in Depth Can take on DIFFERENT FORMS depending on the complexity of the application; in certain instances, it is AN ACTUAL OBJECT that is an ACTUAL IMPLEMENTATION of the application The model Creates a subset of the data by reducing the data from multiple dimensions to one dimension Slicing data The technology used in creating, maintaining, and making information accessible Information Technology In charge of all aspects of the COMPUTER NETWORKS Network Administrator