How The Sensor Functions; Capturing Network Traffic - Cisco IPS-4240-K9 - Intrusion Protection Sys 4240 Installation Manual

Introducing the Sensor
This chapter introduces the sensor and provides information you should know before you install the
sensor. In this guide, the term "sensor" refers to all models unless specifically noted otherwise. For a
complete list of supported sensors and their model numbers, see
This chapter contains the following sections:
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How the Sensor Functions

This section describes how the sensor functions, and contains the following topics:
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Capturing Network Traffic

The sensor can operate in either promiscuous or inline mode.
deploy a combination of sensors operating in both inline (IPS) and promiscuous (IDS) modes to protect
your network.
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How the Sensor Functions, page 1-1
Supported Sensors, page 1-6
Appliances, page 1-8
Modules, page 1-10
Time Sources and the Sensor, page 1-14
Installation Preparation, page 1-16
Site and Safety Guidelines, page 1-17
Cable Pinouts, page 1-20
Capturing Network Traffic, page 1-1
Sensor Interfaces, page 1-3
Promiscuous Mode, page 1-3
Inline Mode, page 1-4
TCP Reset, page 1-4
Supported Interfaces, page 1-5
Your Network Topology, page 1-6
C H A P T E R
Installing Cisco Intrusion Prevention System Appliances and Modules 5.0
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Supported Sensors, page
Figure 1-1 on page 1-2 shows how you can
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