1Z0-1124-25 is a path-selection and traffic-control exam. Strong answers usually come from deciding which network boundary, routing construct, or load-balancing layer the problem belongs to before choosing a service name.
DRG: Dynamic Routing Gateway, the OCI routing hub used for private connectivity and network attachment scenarios.
East-west traffic: Internal traffic moving between private services or tiers rather than in and out of the public edge.
What this guide emphasizes
VCN design, subnet boundaries, routing, and gateway decisions
DRG, FastConnect, DNS, and load-balancing roles
firewall and traffic-control placement
common exam traps around overlapping networking constructs
What strong answers usually do
classify the issue first as edge access, private connectivity, routing, name resolution, or traffic distribution
separate path construction from filtering and inspection
choose the narrowest network control that still solves the problem cleanly
keep public exposure deliberate instead of mixing public and private responsibilities casually