Chapter 8 – Redundancy and High Availability

1. Any three of these: random, round robin, weighed round robin, least connection, least traffic, least latency, IP hash, URL hash, SDN adaptive.
2. Client-side load balancing: easy to implement and effective. Server-side load balancing: better able to guarantee load balancing; transparent to client; more secure; we can provide a message to client when all servers are down.
3. Load balancing and Failover.

4. The most likely cause is that I forgot to update the alias for the server pool to include the new server. Since the firewall rule to allow traffic to pass to the server pool uses this alias, it allows traffic to pass to every server except the new one.
5. (a) Yes; (b) no; (c) yes; (d) no.
6. No; we do not have to create a virtual IP for the PFSYNC interface because use it to pass synchronization data between firewalls; we don’t want...