NS380 / NS380W User Guide 67
YML826 Rev1 - Pan/Tilt Internet Camera
D
DHCP Dynamic Host Configuration Protocol was developed by Microsoft 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 mission-critical applications.
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 100BASE-T, operates at 10 or 100Mbps
per second over UTP, STP, or fiber-optic media.
Firewall Firewall is considered the first line of defense in protecting private
information. For better security, data can be encrypted. 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.