S

Skype

Popular free Internet-based voice chat service.

SSID (service set identifier)

A term used for the name of a wireless network.

SSID broadcast

An advertisement by a wireless router announcing its network’s assigned SSID. Disabling SSID broadcasting can be one wireless networking security measure.

stateful packet inspection (SPI)

Examining each packet that flows through a firewall to make sure that the packet is both in response to a legitimate request by a computer on the home network and the correct packet in the expected sequence of packets.

static IP address

An IP address that is assigned by the ISP (or installed on a private home network) and that does not change. See also dynamic IP address.

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