SHA
Secure Hash Algorithm. SHA is a family of cryptographic hash functions. The SHA algorithm includes the SHA,
SHA-1, SHA-2 and SHA-3 variants.
SIM
Subscriber Identity Module. SIM is an integrated circuit that is intended to securely store the International
Mobile Subscriber Identity (IMSI) number and its related key, which are used for identifying and authenticating
subscribers on mobile telephony devices.
SIP
Session Initiation Protocol. SIP is used for signaling and controlling multimedia communication session such
as voice and video calls.
SIRT
Security Incident Response Team. SIRT is responsible for reviewing as well as responding to computer
security incident reports and activity.
SKU
Stock Keeping Unit. SKU refers to the product and service identification code for the products in the inventory.
SLAAC
Stateless Address Autoconfiguration. SLAAC provides the ability to address a host based on a network prefix
that is advertised from a local network router through router advertisements.
SMB
Server Message Block or Small and Medium Business. Server Message Block operates as an application-
layer network protocol mainly used for providing shared access to files, printers, serial ports, and for
miscellaneous communications between the nodes on a network.
SMS
Short Message Service. SMS refers to short text messages (up to 140 characters) sent and received through
mobile phones.
SMTP
Simple Mail Transfer Protocol. SMTP is an Internet standard protocol for electronic mail transmission.
SNIR
Signal-to-Noise-Plus-Interference Ratio. SNIR refers to the power of a central signal of interest divided by the
sum of the interference power and the power of the background noise. SINR is defined as the power of a
certain signal of interest divided by the sum of the interference power (from all the other interfering signals)
and the power of some background noise.
SNMP
Simple Network Management Protocol. SNMP is a TCP/IP standard protocol for managing devices on IP
networks. Devices that typically support SNMP include routers, switches, servers, workstations, printers,
AOS-W 6.5.3.x | User Guide Glossary of Terms | 1150
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