EverFocus EDVR 16D1 Manual de instrucciones descargar pdf (Pagina 89)

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Each host in a LAN has a gateway. A gateway address is composed of four octets

(numbers in the range of 0 to 255) separated by decimal points. The gateway address is

used to uniquely identify a host or computer on the LAN which assigns the IP addresses

to your network. For example, a Linksys router has an IP address of 192.168.1.1. If you

were using this type of router within your LAN, then your gateway would be the IP

address of the Linksys router. The reason for this is because the Linksys is responsible

for assigning the IP addresses for your network. This is similar to the zip code of your

address.

A port number represents an endpoint or "channel" for network communications. Port

numbers allow different applications on the same computer to utilize network resources

without interfering with each other. Port numbers most commonly appear in network

programming, particularly socket programming. Sometimes, though, port numbers are

made visible to the casual user. For example, some Web sites a person visits on the

Internet use a URL like the following:

http://www.company.com:8100/

In this example, the number 8100 refers to the port number used by the Web browser to

connect to the Web server. Normally, a Web site uses port number 80 and this number

need not be included with the URL (although it can be). In IP networking, port numbers

can theoretically range from 0 to 65535. Most popular network applications, though, use

port numbers at the low end of the range (such as 80 for HTTP). This could be similar to

the front door of your house. Without the door to the house being open you could not

enter it. This is the same case with ports on a network. If the ports for a specific IP

address are not open then you could not gain access to that IP address or what it is

addressing.

Note: The term port also refers to several other aspects of network technology. A

port can refer to a physical connection point for peripheral devices such as serial,

parallel, and USB ports. The term port also refers to certain Ethernet connection

points, such as those on a hub, switch, or router.

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EverFocus EDVR 16D1 Manual de instrucciones Pagina 89