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Voice over IP (VoIP)
A network service that provides voice communication services by transporting the voice traffic as network packets over an IP network.
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A form of monitoring in which the flow of packets rather than the actual content of packets is examined. Also referred to as trend analysis. A type of security threat that occurs when an outside entity is able to monitor and analyze traffic patterns on a network.
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A network communications process that protects the contents of protocol packets by encapsulating them in packets of another protocol. Technology enabling one network to send its data via another network’s connections. Tunneling works by encapsulating a network protocol within packets carried by the second network. The use of authentication and encryption to set up virtual private networks (VPNs).
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A device that connects two or more physical networks and forwards packets between them. Bridges can usually be made to filter packets, that is, to forward only certain traffic. A network device used to connect networks with different speeds, cable types, or topologies that still use the same protocol. A bridge is a layer 2 device.
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A firewall that evaluates the state or the context of network traffic. By examining source and destination address, application usage, source of origin, and relationship between current packets with the previous packets of the same session, stateful inspection firewalls are able to grant a broader range of access for authorized users and activities and actively watch for and block unauthorized users and activities. Stateful inspection firewalls are known as third-generation firewalls.
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Highspeed switch that forwards packets between datalink segments. Most LAN switches forward traffic based on MAC addresses. This variety of LAN switch is sometimes called a frame switch. LAN switches are often categorized according to the method they use to forward traffic: cutthrough packet switching or storeandforward packet switching. Multilayer switches are an intelligent subset of LAN switches. Compare with multilayer switch. See also cutthrough packet switching, storeandforward packet switching.
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