CCNA Chapter 1

CCNA Chapter 1 What is a network? - A network is all of the components involved in connecting computers and applications across small and large distances to increase productivity and give easy access to information. What resources are commonly shared across a network? - Data and applications, printers, network storage components, and backup storage components. What 7 characteristics should be considered when creating or maintaining a network? - Cost, security, speed, topology, scalability, reliability, and availability. How is network Reliability measured? - As the Mean time between Failures - or MTBF - which is a measurement used to indicate the likelihood of a component failing. How is network Availability measured? - As an "uptime" annual percentage that is calculated by taking the number of minutes the network is available and dividing it by the number of minutes in a year, which is 525,600. In a network, what is a "network-aware" application? - An application that allows you to access and use resources that are not located on your local computer. What are 3 common networking applications? - E-mail, FTP, and web applications. What do Protocols do? - Protocols are used to implement applications. Name 5 common network protocols. - Simple Mail Transfer Protocol (SMTP), Internet Message Access Protocol version 4 (IMAP4), Post Office Protocol 3 (POP3), File Transfer Protocol (FTP), and Hypertext Transfer Protocol (HTTP) What specific requirements are needed for large data transfers for things such as Voice over IP (VOIP) and video Quality of Service (QoS)? - Minimal delay and latency. What 3 component categories do you need to build a network? - Computers, networking, and media. Name 9 common network components. - "Hubs, bridges, switches, routers, firewalls, wireless access points, modems, NT1s (Network Terminator Type 1 is an ISDN network termination device), and channel service units/data service units (CSU/DSUs)."