D |
|
DHCP | Dynamic Host Configuration Protocol was developed by Microsoft and 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. DHCP 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. This means |
| 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 distributed |
| company and operates the company’s |
Ethernet | The most popular LAN communication technology. There are a variety of types of Ethernet, |
| including 10 Mbps (traditional Ethernet), 100 Mbps (Fast Ethernet), and 1,000 Mbps (Gigabit |
| Ethernet). Most Ethernet networks use Category 5 cabling to carry information, in the form of |
| electrical signals, between devices. Ethernet is an implementation of CSMA/CD that operates in a |
| bus or star topology. |
F |
|
Fast Ethernet | Fast Ethernet, also called |
| optic media. |
Firewall | A firewall is considered the first line of defense in protecting private information. For better |
| security, data can be encrypted. A firewall is a system designed to prevent unauthorized access to |
| or from a private network. Firewalls are frequently used to prevent unauthorized Internet users |
| from accessing private networks connected to the Internet, especially Intranets. All messages |
| entering or leaving the intranet pass through the firewall, which examines each message and |
| blocks those that do not meet the specified security criteria. |
G |
|
Gateway | A gateway links computers that use different data formats together. |
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