Common Pitfalls to Avoid
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NSG vs Firewall
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NSG = subnet/NIC-level filtering, basic allow/deny rules.
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Firewall = centralized, advanced filtering (FQDN, application rules, logging).
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Exam trap: If “block domains or centralize rules across VNets,” answer is Firewall.
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VPN Gateway vs ExpressRoute
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VPN = encrypted tunnel over internet, lower bandwidth.
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ExpressRoute = dedicated private circuit, high bandwidth, low latency.
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Exam trap: “Dedicated private line” always means ExpressRoute.
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Load Balancer vs Application Gateway
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Load Balancer = Layer 4 (TCP/UDP), basic distribution.
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Application Gateway = Layer 7 (HTTP/HTTPS), smart routing + WAF.
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Exam trap: If question mentions “URL-based routing,” answer is App Gateway.
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Service Endpoints vs Private Link
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Service Endpoints = secure traffic from VNet to service, but service still has a public IP.
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Private Link = service gets a private IP, no public internet exposure.
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Exam trap: “Completely disable public exposure” → Private Link.
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IP Addressing Confusion
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Dynamic IPs can change if resource is stopped/deallocated.
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Static IPs are fixed.
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Exam trap: If scenario mentions “firewall rules need consistent IP,” choose Static.
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Quick Recall Hacks
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“Segment workloads inside a network” → Subnets + NSGs
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“Remote workers connect securely” → Point-to-Site VPN
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“Connect HQ to Azure securely over internet” → Site-to-Site VPN
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“Connect HQ to Azure via private circuit” → ExpressRoute
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“Filter HTTP traffic, protect apps” → Application Gateway + WAF
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“Load balance TCP across VMs” → Azure Load Balancer
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“Restrict access to VNet only” → Service Endpoint
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“Assign private IP to SQL/Storage” → Private Link
What to Expect in the Exam
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At least 2–3 direct definition questions (e.g., “Which service provides Layer 7 load balancing?”).
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Several scenario-based questions (e.g., connecting on-premises, securing traffic, segmenting VNets).
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Trick questions that mix up NSG vs Firewall and Service Endpoint vs Private Link.
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Network planning questions around IP ranges, subnets, and DNS.
Final Exam Strategy
When answering networking questions, always:
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Identify if the requirement is internal or external communication.
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Decide if traffic must flow over internet or private connection.
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Look for layer of control (subnet vs centralized firewall vs application-level).
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Match keywords (URL routing, private IP, dedicated circuit, dynamic IP).