Change of Authorization ( COA)
--> Radius is Client/Server Architecture, in which client always starts the session and Server replies to the client.
--> By default Once AAA client get the access to the network, it is not possible to remove the access from the network or change the permissions because of this limitation.
--> Dynamic Authorization Enhancement to Radius Server is also known as Change of Authorization allows Radius Server start the session.
--> COA enables Radius Server start the session to the network device, removing access to the network and it can also tell the device to re-authenticate the user.
--> Radius is Client/Server Architecture, in which client always starts the session and Server replies to the client.
--> By default Once AAA client get the access to the network, it is not possible to remove the access from the network or change the permissions because of this limitation.
--> Dynamic Authorization Enhancement to Radius Server is also known as Change of Authorization allows Radius Server start the session.
--> COA enables Radius Server start the session to the network device, removing access to the network and it can also tell the device to re-authenticate the user.
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