Networking

Exam guide§2.3, 3.3

The deepest domain in every good set of ACE notes. VPCs and firewalls first, then the load-balancer decision, then hybrid connectivity.

Topics to cover

Fundamentals: Layer 3 basics, IP classes, CIDR, subnet masks, host math (vendor-neutral refresher)
VPC: auto vs custom mode, subnets and IP ranges (resizing), routes, Shared VPC, VPC Peering
Firewall rules and Cloud NGFW policies: ingress/egress, targets, Tags, service accounts
Load balancing: the selection table (global vs regional, external vs internal, L7 vs L4)
Hybrid connectivity: Cloud VPN (HA), Dedicated/Partner Interconnect, peering options
Cloud DNS, Cloud NAT, static internal/external IPs, Private Google Access
Network Service Tiers (Premium vs Standard)
Common network designs: multi-zone availability, multi-region globalization