Information about Network Firewalls

Network firewalls are a set of related programs that protect the resources of a private network from users from other networks. (The term also implies the security policy that is used with the programs.) Firewalls are typically located at the network gateway server. Any enterprise (company, organization, etc.) with an intranet that allows its workers access to the wider Internet should install a firewall to prevent outsiders from accessing its own private data resources, and for controlling what outside resources its own users have access to; as should companies specializing in e-commerce (especially those that accept and retain credit card and other personal information). In addition to their security aspects, firewalls can also be used to store open access data about a companies products and services, files to download, bug fixes, and so forth. Functionally, firewalls work closely with a router program to examine each network packet and determine whether to forward it toward its destination. Firewalls also include or work with a proxy server that makes network requests on behalf of workstation users.

Products & Services Related to Network Firewalls

Network Equipment

Network equipment is used to split, switch, boost, or direct packets of information along a network. This product area includes network hubs, switches, routers, bridges, gateways, multiplexers, transceivers and firewalls. Often, network equipment is defined by is protocol or port type (e.g., Ethernet switch, USB hub).

Network Hubs

Network hubs serve as the central location for attaching wires to workstations.

Network Repeaters

Network repeaters regenerate incoming electrical, wireless or optical signals to preserve signal integrity and extend the distance over which data can travel. They are often used to connect cable segments in IEEE 802.3 networks.

Network Routers

Network routers are protocol-dependent devices that connect subnetworks. They are also used to break down a large network into smaller subnetworks.

Network Switches

Network switches route packets between ports at the OSI layer 2, which means that (in Ethernet) the switches decide where incoming packets are transferred to, based on the NIC's 48-bit address.

Network Transceivers

Network transceivers, short for transmitter-receiver, are devices that both transmit and receive analog or digital signals.

VoIP and IP Telephony

VoIP and IP telephony allows PC users to make phone calls over the Internet or other packet networks via gateways and standard telephones.