Cisco Certification and Its Importance !

Cisco certification is essential to everyone who needs to get hands on networking. Cisco is major leading company in network industry to build hardware equipment. Side by side Cisco providing certification for individual backgrounds of networking.  There are many and popular certification i.e Routing and Switch,Voice ,Security and Wireless.

OSI Reference Model

All networks are use in today are based on concept of Open System Interconnection (OSI) Reference Model developed in 1984 by ISO (International Organization of Standards). Instead, ISO decided to established a common reference model for which other could then develop detailed interfaces, which in turn could become standards.

CSMA/CD ” Carrier Sense Multple Access with Collision Domain “

CSMA/CD is a Media Access Control (MAC) protocol that defines how network devices respond when two devices attempt to use a same channel simultaneously and cause a data collision. It is a basic rule that prevent the lose of information and save bandwidth from collision on Ethernet Networks.