KP-32 User Manual
99
Bosch Security Systems, Inc.
User Manual
F.01U.193.253
Rev. 16
Network Terminology
Bridge
A bridge is a device that connects two LANs, or two segments of the same LAN that use the
same protocol. Sometimes called “transparent bridges” they work at the OSI model layer 2.
Simply put, they are not concerned with protocols. Their main job is to pass data to a
destination address that is predetermined in the data packet.
With a bridge, all of your computers are on the same network subnet (see Subnet). This means
your computers can communicate with each other an have their own internet connection. If
you assign your own IP addresses be sure to use the same first three (3) octets of the IP
address (for example, 192.168.0.X).
Domain Name Server
(DNS)
A DNS Server is an internet service that translates domain names (for example, in the URL
http//www.telex.com, the domain name is telex.com) into IP addresses. The internet is based
on IP address which are numeric, and since domain names are alphabetic, they are easier to
remember. Every time a domain name is used it must go through the DNS server to be
translated.
Gateway
A gateway is a node on a network that serves as an entrance to another network. The gateway
routes traffic from a computer to an outside network that is serving the web pages. For
example, the gateway for a home computer is the ISP provider that connects the user to the
Internet.
In a corporate environment, the gateway often acts as a proxy server and a firewall. Gateways
are similar to routers and switches, in that they forward data to the destination and provide the
path for which the data travels to the destination.
Hub
A hub is a common connection point for devices in a network. A hub has multiple ports.
When a data packet arrives at a hub, it is copied and distributed to all of its ports so that all
nodes on the LAN can see the packets.
There are three (3) types of hubs:
passive hub - this hub serves as a conduit for the data, enabling it to go
from one device to another.
intelligent hub - (also known as manageable hubs) this hub includes
additional features that enable administrators to monitor traffic through
the hub.
switching hub - this hub reads the destination address of each packet
and then forwards the data pack to the appropriate port.
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