01
OSI and TCP/IP models, subnets, routes and ports
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GitHub Actions Academy · Enterprise Knowledge Graph
Networking and Connectivity Knowledge Graph
Relate addressing, routing, DNS, firewalls, load balancing, private access, hybrid connectivity and network observability.
Objective: Create an end-to-end view of how applications communicate and where security, availability and operational controls apply.
Practical guidance
Foundations and prerequisites
02
DNS resolution, certificates and common application protocols
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03
Network segmentation and high-availability fundamentals
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Practical guidance
Technology relationships and dependencies
01
VNets or VPCs connect subnets, peers and shared services
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02
Firewalls, NSGs, proxies and private endpoints enforce policy
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03
VPN, ExpressRoute or Direct Connect link cloud and on-premises estates
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Practical guidance
Architecture, delivery and operations
01
Design hub-and-spoke, Virtual WAN and multi-region traffic patterns
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02
Standardise IPAM, DNS, firewall change and route ownership
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03
Monitor flow logs, latency, packet loss and dependency health
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Practical guidance
Validation and learning evidence
01
Trace approved and denied traffic paths end to end
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02
Test route, DNS, gateway and firewall failure scenarios
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03
Document effective routes, owners, SLAs and escalation paths
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