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ccna certification value in india.RedundantPower System (RPS) LED: Indicates the status of the redundant power system. 3Port Status (STAT) LED: When the Port Status LED is green, it indicates that the Port Status mode is selected. This mode is the default mode. 4Port Duplex (DUPLEX) LED: When the Port Duplex LED is green, it indicates that the Port Duplex mode is selected. 5Port Speed (SPEED) LED: Indicates that the Port Speed mode is selected.Chapter 7 Switching Networks .93 - 6 Power over Ethernet ( PoE) LED: indicates that Port Duplex mode is selected.6 Power over Ethernet ( PoE) Mode LED: If the switch supports PoE functionality, the PoE Mode LED is present.7.2 Overview of SSH and Switch Port SecuritySwitch security is an important issue because it can be subject to malicious attacks such as MAC flooding attacks, DHCP spoofing and depletion attacks, man-in-the-middle attacks, CDP attacks, and Telnet DoS attacks.To prevent the switch from being probed or controlled by attackers, you must take appropriate measures to secure the switch.Common security measures include: configuring Disable unneeded services and applications, disable unused ports, turn off SNMP or use SNMPv3, enable system logging, and install the latest IOS software in a timely manner. Some of the security measures such as configuring access passwords and configuring tagline messages were discussed in Chapter 3.7.2.1 Introduction to SSHRemote management of devices using Telnet uses insecure plaintext transmission for login authentication and data transfer between communicating devices, which is not effective in preventing information leakage during remote management. SSH, short for SecureShell, provides encryption and authentication to protect the device from attacks such as IP address fraud and plaintext password interception when a user logs in to the device remotely through a network environment that is not secure. SSH works on port TCP22. SSH currently includes two versions, SSH1 and SSH2, and the two versions are not compatible; the communicating parties negotiate the version to be used. To achieve a secure SSH connection, the server side and the client side have to go through five stages in the whole communication process: version number, key and algorithm, authentication stage negotiation, and session request and session interaction. SSH version 2 is recommended because it is more powerful in data encryption and integrity verification.