Also known as simple persistence, source address affinity persistence supports TCP and UDP protocols. This persistence also directs session requests to the same server-based solely on the source IP address of a packet.
The DNS-based load-balancing essentially sends agents to their servers in a round-robin fashion: Agent 1 => Server 1, Agent 2 => Server 2, etc. If Server 1 isn't available, Agent 1 goes to Server 2, etc. If all but one Server fails, all Agents go over to the available Server - 3, 4, 5, etc., until previous Servers are back online. After which, DNS again assigns Agent 1, 2, etc., to servers in order available => Server 1, 2, etc.
Ping times (by Load Balancer like F5) can determine how quickly new connections can go to the newly available servers.
Presumably Endpoints have a choice of two Servers (internal vs external). Otherwise all the "work" of load-balancing gets completed by the LB implementation (e.g., F5, etc.)
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