Cisco system Inc. is the leader in manufacturing network hardware used in computer networks. Its headquarter is in America, San Jose California. The company’s specialty is making network connectors-routers, bridges and switches. They also design technologies and services for Internet communication. Cisco is known for network products that support more than one protocol. Protocols are standards or sets of instructions that regulate or enable a communication data transfer or connection between two points (sender and receiver). While Cisco does not write protocols, its products use them to communicate. They are the worldwide leaders in networking for the internet.