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GL-20
Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
SN
Serial Number. Part of the UDI. The SN is the serial number of your Cisco product.
SNAP
Subnetwork Access Protocol. Internet protocol that operates between a network entity in the
subnetwork and a network entity in the end system. SNAP specifies a standard method of encapsulating
IP datagrams and ARP messages on IEEE networks. The SNAP entity in the end system makes use of
the services of the subnetwork and performs three key functions: data transfer, connection
management, and QoS selection.
sniffing interface
See sensing interface.
SNMP
Simple Network Management Protocol. Network management protocol used almost exclusively in
TCP/IP networks. SNMP provides a means to monitor and control network devices, and to manage
configurations, statistics collection, performance, and security.
SNMP2
SNMP Version 2. Version 2 of the network management protocol. SNMP2 supports centralized and
distributed network management strategies, and includes improvements in the SMI, protocol
operations, management architecture, and security.
software bypass
Passes traffic through the IPS system without inspection.
source address
Address of a network device that is sending data.
SPAN
Switched Port Analyzer. Feature of the Catalyst 5000 switch that extends the monitoring abilities of
existing network analyzers into a switched Ethernet environment. SPAN mirrors the traffic at one
switched segment onto a predefined SPAN port. A network analyzer attached to the SPAN port can
monitor traffic from any other Catalyst switched port.
spanning tree
Loop-free subset of a network topology.
SQL
Structured Query Language. International standard language for defining and accessing relational
databases.
SRAM
Type of RAM that retains its contents for as long as power is supplied. SRAM does not require constant
refreshing, like DRAM.
SSH
Secure Shell. A utility that uses strong authentication and secure communications to log in to another
computer over a network.
SSL
Secure Socket Layer. Encryption technology for the Internet used to provide secure transactions, such
as the transmission of credit card numbers for e-commerce.
Stacheldraht
A DDoS tool that relies on the ICMP protocol.
State engine
Stateful searches of HTTP strings.
Statistics Processor
A processor in the IPS. Keeps track of system statistics such as packet counts and packet arrival rates.
Stream Reassembly
Processor
A processor in the IPS. Reorders TCP streams to ensure the arrival order of the packets at the various
stream-based inspectors. It is also responsible for normalization of the TCP stream. The normalizer
engine lets you enable or disable alert and deny actions.
String engine
A signature engine that provides regular expression-based pattern inspection and alert functionality for
multiple transport protocols, including TCP, UDP, and ICMP.