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Because IPSec is integrated at the Internet layer (layer 3), it provides security for almost all protocols in the TCP/IP suite, and because IPSec is applied transparently to applications, there is no need to configure separate security for each application that uses TCP/IP.
Note Although a Catalyst 4500-X series switch (WS-4500X-32) supports Cisco TrustSec technology, it does not support TrustSec MACsec Encryption. MACsec is the IEEE 802.1AE standard for authenticating and encrypting packets between two MACsec-capable devices.The Catalyst 4500 series switch supports 802.1AE encryption with MACsec Key Agreement (MKA) on downlink ports for encryption between the switch and host devices.ink layer security can include both packet authentication between switches and MACsec encryption between switches (encryption is optional). Note MACsec is supported on the Catalyst 4500 series switch universal k9 image. It is not supported with the NPE license or with a LAN Base service image.