What remains unchanged for wireless clients during layer 3 roaming?

During layer 3 roaming, the Client Point of Presence (PoP) remains unchanged for wireless clients. This means that, despite moving between different access points or geographical areas within a network, the client can maintain its network connectivity and keep its IP address.

In layer 3 roaming, when a client moves from one access point to another, it may or may not perform a new DHCP lease acquisition depending on whether the new access point is on the same subnet. If it is on the same subnet, the client retains its existing IP address and network settings, allowing for a seamless transition without the need for re-authentication or changes in session parameters.

Options like WLAN Configuration, Security Protocol, and Session Timeout can be subject to change based on the policies set forth in the network design or the type of authentication used. For example, when moving to a different WLAN, the configuration can differ or security protocols may vary between networks. Similarly, session timeout settings can differ based on the access point or network's configuration.

Thus, the Client PoP, representing where the device connects to the network at a given time, is the aspect that remains unchanged during layer 3 roaming.