This part is more about virtual private network, cloud interconnect, and direct peering. With these three interconnection options, you can have an optimum solution in your architecture.
Load balancing has multiple solutions, such as internet, internal, single region, multiple regions, and so on. You can also have a rule-based routing mechanism, content-based load balancing, and cross-region load balancing.
Also, get a good understanding of the best practices in load balancing for certification.