Introduction - Basics (network)
What does 'Computer Network' mean? Computer Network is a collection of devices (nodes) connected by a communication link. These devices that form a network (nodes) are capable of sending or/and receiving data. They aid in Data Communication. What are the criteria that must be considered to judge the effectiveness of a network? 1. Performance - quality of service. can me measured by calculating the time it takes between sending a data request and recieving the data ( transit time and response time ) over a network. Metrics considered here : throughput, delay. 2. Reliability - the fault tolerance of the network. measured by the frequency of failure, the time it takes a link to recover from a failure, and the network's (recovers) robustness in a catastrophe (in case of an error or fault) 3. Security - includes protecting data beings transmitted from unauthorized access, protecting data alterted or deleted, and implementing policies and procedures for recovery from breac