Communication | Communication has four components: sender, receiver, |
| message, and medium. In networks, devices and application |
| tasks and processes communicate messages to each other |
| over media. They represent the sender and receivers. The |
| data they send is the message. The cabling or transmission |
| method they use is the medium. |
Connection | In networking, two devices establish a connection to |
| communicate with each other. |
D
DHCP | Developed by Microsoft, DHCP (Dynamic Host Configuration |
| Protocol) is a protocol for assigning dynamic IP addresses to |
| devices on a network. With dynamic addressing, a device |
| can have a different IP address every time it connects to the |
| network. In some systems, the device's IP address can even |
| change while it is still connected. It also supports a mix of |
| static and dynamic IP addresses. This simplifies the task for |
| network administrators because the software keeps track of |
| IP addresses rather than requiring an administrator to |
| manage the task. A new computer can be added to a |
| network without the hassle of manually assigning it a unique |
| IP address. DHCP allows the specification for the service |
| provided by a router, gateway, or other network device that |
| automatically assigns an IP address to any device that |
| requests one. |
DNS | Domain Name System is an Internet service that translates |
| domain names into IP addresses. Since domain names are |
| alphabetic, they're easier to remember. The Internet |
| however, is really based on IP addresses every time you use |
| a domain name the DNS will translate the name into the |
| corresponding IP address. For example, the domain name |
| www.network_camera.com might translate to |
| 192.167.222.8. |
E
Enterprise network An enterprise network consists of collections of networks connected to each other over a geographically dispersed area. The enterprise network serves the needs of a widely
- 122 -
