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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.
Between MACsec-capable devices, packets are encrypted on egress from the sending device, decrypted on ingress to the receiving device, and in the clear within the devices. This feature is only available between 802.1AE-capable 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.