Cisco IPS-4255-K9 Installation Guide - Page 19

Introducing the Sensor CH A P T E R 1 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 noted otherwise. For a complete list of supported sensors and their model numbers, see Supported Sensors, page 1-17. This chapter contains the following sections: • How the Sensor Functions, page 1-1 • Supported Sensors, page 1-17 • IPS Appliances, page 1-18 • IPS Modules, page 1-20 • Time Sources and the Sensor, page 1-26 • Installation Preparation, page 1-29 • Site and Safety Guidelines, page 1-30 • Cable Pinouts, page 1-33 How the Sensor Functions This section describes how the sensor functions, and contains the following topics: • Capturing Network Traffic, page 1-1 • Your Network Topology, page 1-3 • Correctly Deploying the Sensor, page 1-3 • Tuning the IPS, page 1-3 • Sensor Interfaces, page 1-4 • Interface Modes, page 1-12 Capturing Network Traffic The sensor can operate in either promiscuous or inline mode. Figure 1-1 on page 1-2 shows how you can deploy a combination of sensors operating in both inline (IPS) and promiscuous (IDS) modes to protect your network. OL-18504-01 Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0 1-1