Azure AZ-104 Networking Domain 2027 — The Most Failed Section and How to Pass It
Written on: 09/15/2026
Category:
Exam Aid
written by : Harrison James
There is a pattern that shows up constantly with AZ-104 candidates who come to us after a failed attempt.
They studied hard. They covered all five domains. They worked through practice questions, scored reasonably well, and felt prepared going into the exam. Then the score report comes back and the networking domain is sitting at the bottom sometimes well below passing while every other domain is either passing or close to it.
This is not a coincidence. Azure networking is not just the hardest domain on AZ-104. It is hard in a specific way that catches out candidates who prepared correctly for every other part of the exam but used the wrong approach for this one.
Understanding why and what the right approach actually looks like is the difference between failing this exam twice and passing it once.
Azure networking is the most failed content area on AZ-104 and the domain most resistant to reading-only preparation. The networking domain covers virtual networks, subnets, network security groups, VNet peering, Azure Firewall, load balancers, application gateways, and Azure DNS at an operational depth that requires hands-on Azure Free Tier practice to develop not conceptual understanding from study guides. Candidates who allocate 30 to 40% of total AZ-104 preparation time to networking specifically, including hands-on lab work, consistently outperform those who treat networking as one domain among five.
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Every AZ-104 domain has a knowledge component and an application component. For most domains identity and governance, storage, compute the gap between knowing concepts and answering exam questions correctly is manageable. A well-read candidate can bridge it through practice questions and careful reasoning.
The networking domain is different. The gap between knowing networking concepts and answering AZ-104 networking questions correctly is wide enough that reading alone even thorough, structured, well-sourced reading cannot reliably close it.
The reason is operational depth. AZ-104 does not ask you what a network security group is. It asks you why a specific NSG rule is blocking traffic that should be allowed, what the correct priority order should be to fix it, and what happens to traffic flow after you make the change. It asks you to look at a VNet peering configuration and identify why routing between two virtual networks is not working as expected. It presents a scenario where an organisation needs to route traffic through a specific network virtual appliance and asks you which combination of route tables and next-hop settings achieves this.
These are operational questions. They test whether you have actually worked with Azure networking, not whether you have read about it. And the candidates who consistently fail them are the ones who prepared the right way for a different kind of question.
This is also the domain with the highest topic density. Virtual networks, subnets, NSGs, ASGs, VNet peering, Azure Firewall, Azure DNS, load balancers, application gateways, VPN gateways, ExpressRoute, private endpoints, service endpoints all of these appear on the exam, and all of them require more than a surface-level understanding. If you want to build a solid foundation before going deep on networking specifically, reviewing [foundational Azure concepts] from the AZ-900 level first is worth the time investment for candidates who are new to the Azure ecosystem.
Microsoft publishes the AZ-104 exam objectives, and the networking domain is listed as approximately 20 to 25% of total exam content the second-largest domain by weighting. Within networking, the topics that appear most frequently and with the most complexity are not spread evenly. Some topics carry significantly more exam weight than others.
Virtual networks and subnets including address space planning, subnet design, and the implications of overlapping CIDR blocks are foundational to almost every other networking question. NSG rules, with their priority logic and directional traffic flow, appear repeatedly. VNet peering and the routing behaviour that comes with it is a consistent source of exam questions. Load balancers and application gateways, and specifically when each is appropriate, are tested at a decision-making level rather than a definition level.
Azure DNS both public and private zones appears less frequently but with high complexity when it does. VPN gateways and ExpressRoute connections appear in scenario-based questions that require understanding their differences and appropriate use cases.
For your [full AZ-104 preparation], networking needs to be treated as a domain requiring both conceptual coverage and operational practice and the two need to happen in parallel, not sequentially.
Most candidates understand what a virtual network is and what subnets are for. The exam does not test that understanding. It tests what happens when VNet configurations interact with each other and with other Azure resources in specific ways.
The questions you will face on VNets and subnets go several layers deeper than definition. You will be asked to identify whether two VNets with overlapping address spaces can be peered they cannot, and the exam will test whether you know this and why. You will be presented with a subnet design scenario and asked to identify which subnet configuration meets a specific set of requirements around resource isolation and traffic control. You will be asked about the reserved IP addresses within every Azure subnet the first four and the last one are reserved by Azure and how this affects the usable host count when planning address space.
Service endpoints and private endpoints both appear in the context of VNet and subnet configuration, and the exam tests whether you understand the difference between them and when each is appropriate. Service endpoints extend the VNet identity to Azure services over the Azure backbone. Private endpoints place a private IP address from your VNet into the Azure service, making it accessible as if it were on your own network. These are not interchangeable and the exam is specific about when each applies.
The preparation approach for this topic is to build virtual networks in the Azure portal, experiment with subnet configurations, and deliberately test the behaviours that the exam questions describe. Reading about overlapping address spaces is not the same as attempting to peer two VNets with overlapping CIDR blocks and seeing what Azure does.
Network security groups are the topic that produces the most exam failures within the networking domain. Not because the concept is complex most candidates understand that NSGs filter traffic based on rules but because the exam tests priority ordering logic in ways that catch out candidates who have only read about it.
NSG rules are processed in priority order from lowest number to highest number. Priority 100 is processed before priority 200. The first matching rule wins processing stops. This is the logic the exam builds scenario questions around, and it is the logic that breaks down when candidates have not actually worked with NSGs and watched traffic flow change as rules are added, modified, or reordered.
The questions candidates consistently get wrong involve scenarios where a deny rule at a lower priority number overrides an allow rule at a higher priority number for the same traffic type, or where default rules the implicit deny-all that every NSG includes interact with custom rules in ways the candidate did not anticipate. Inbound and outbound rules are separate, and the exam tests both directions with scenarios designed to expose candidates who have memorised the concept without internalising the operational logic.
The fix is not reading more NSG documentation. The fix is creating NSGs in Azure, writing rules, testing traffic flow, changing priorities, and observing what happens. This is a skill that develops through practice — and through making the mistakes in a lab environment that you cannot afford to make in the exam.
VNet peering connects two Azure virtual networks so that resources in each can communicate with each other using private IP addresses, routed through the Azure backbone without passing through the public internet or requiring a gateway.
The exam tests VNet peering at a configuration depth that requires understanding several behaviours that are not obvious from a high-level description. Peering is not transitive. If VNet A is peered with VNet B, and VNet B is peered with VNet C, resources in VNet A cannot communicate with resources in VNet C unless there is a direct peering between A and C, or unless a hub-and-spoke architecture with a network virtual appliance is explicitly configured to allow it. This non-transitivity is one of the most tested VNet peering behaviours on AZ-104.
Peering connections must be created in both directions. A peering from VNet A to VNet B and a peering from VNet B to VNet A are two separate connections, both required for the peering to be active. The exam tests whether candidates know this and can identify a misconfigured peering scenario where only one direction has been established.
The allow gateway transit and use remote gateway settings appear in exam questions about hub-and-spoke topologies. These settings allow a peered VNet to use the VPN or ExpressRoute gateway of another VNet, and the exam tests the configuration logic for enabling this correctly.
Build these configurations in your [Azure Free Tier account]. Create three VNets, attempt to route traffic between non-peered VNets, add peering connections one direction at a time and observe what changes. This kind of deliberate experimentation builds the intuition that exam questions are designed to test.
This is consistently one of the highest-frequency decision questions in the AZ-104 networking domain, and it is a question where candidates who understand both services at a conceptual level still fail because they have not internalised the decision logic.
Azure Load Balancer operates at Layer 4 of the OSI model the transport layer. It distributes traffic based on IP address and port. It does not inspect the content of the traffic. It is appropriate for non-HTTP traffic, for TCP and UDP load balancing, and for scenarios where the decision about where to route traffic is based purely on network-layer information.
Azure Application Gateway operates at Layer 7 the application layer. It can inspect HTTP and HTTPS traffic, make routing decisions based on URL path or hostname, perform SSL termination, and apply web application firewall rules. It is appropriate for HTTP-based applications where routing decisions need to be based on traffic content, not just source and destination.
The exam will give you a scenario a web application with multiple backend services that need to be reached based on URL path, for example and ask which service is appropriate. Getting this right consistently requires understanding not just what each service does but why the distinction matters in practice. Candidates who have deployed both services in a lab environment and tested URL-path-based routing through Application Gateway remember the difference in a way that reading does not produce.
The Microsoft documentation on [Azure Virtual Network] covers the integration of these services with VNet configurations and is worth reading alongside your lab work rather than instead of it.
The most effective approach to AZ-104 networking preparation is a structured lab sequence that builds skills progressively, starting with foundational configurations and moving toward the multi-service scenarios the exam tests.
Begin with virtual network and subnet creation. Build several VNets with non-overlapping address spaces, create subnets within them, and deploy a small virtual machine into each. Verify connectivity within a VNet before adding any additional complexity.
Add NSGs next. Create network security groups, attach them to subnets and network interfaces, write inbound and outbound rules, and deliberately test blocked and allowed traffic. Change priorities and observe what changes. Create a deny rule that overrides a more permissive rule and verify the outcome.
Configure VNet peering between two of your VNets. Test connectivity. Break the peering by deleting one direction and observe the result. Add a third VNet and confirm that peering A-to-B and B-to-C does not allow A-to-C communication without direct peering.
Deploy an Azure Load Balancer and an Application Gateway and route traffic to backend pools. Configure URL-path-based routing in the Application Gateway and test that requests to different URL paths reach different backends.
Finish the lab sequence with Azure DNS create a private DNS zone, link it to a VNet, and verify that virtual machines resolve custom domain names correctly.
This sequence takes approximately fifteen to twenty hours of lab work. It is the fifteen to twenty hours that most candidates skip and it is precisely the fifteen to twenty hours that most consistently determine exam outcomes in the networking domain.
From highest to lowest frequency based on what AZ-104 candidates consistently report and what Microsoft's published objectives reflect, the networking topics appear roughly in this order.
Network security groups and their rule logic appear most frequently. Virtual networks and subnet configuration come next. VNet peering including non-transitivity and gateway transit is a consistent presence. Load balancer and Application Gateway decision questions appear regularly. Azure DNS, both public and private, appears with moderate frequency. VPN gateways and ExpressRoute appear less frequently but in high-complexity scenario questions when they do. Private endpoints and service endpoints round out the list as supporting topics that appear in context with VNet and subnet questions.
Prepare in this order. Do not spend equal time on all topics. The exam is not evenly distributed and your preparation should not be either.
Candidates who prepare for AZ-104 networking through reading and multiple choice practice alone tend to share a specific failure profile. Their practice exam scores on networking questions are inconsistent they answer straightforward definition questions correctly and scenario-based operational questions incorrectly. Their confidence going into the exam is lower than on other domains. And their score reports after a failed attempt show networking as the weakest section, often significantly below the other domains.
Candidates who add structured hands-on lab work to their networking preparation show a different pattern. Their practice exam scores on scenario-based questions improve significantly after lab work not because the questions got easier but because the operational intuition they developed in the lab lets them reason through scenarios they have not seen before. Their confidence in networking relative to other domains equalises. And their pass rate on the first attempt is substantially higher.
This is not anecdotal. It is the consistent pattern across the candidates we coach at TestHelpNow, and it aligns with what the exam is designed to test. AZ-104 is an administrator-level certification. It is designed to verify that you can administer Azure, not just describe it. The networking domain is where that distinction is sharpest.
The networking domain is the part of AZ-104 preparation where the difference between a structured approach and an unstructured one shows up most clearly in outcomes. Knowing what to build in the lab, in what order, and how to connect lab experience to exam question logic is something most candidates cannot develop effectively on their own not because they are not capable but because they do not have the exam-side visibility to know what the questions are actually testing.
At TestHelpNow, our AZ-104 coaching includes a networking-specific preparation track structured lab sequences, scenario question review, and targeted coverage of the NSG, VNet peering, and load balancing topics that drive the most exam failures. We work with candidates from initial diagnosis of weak areas through to exam-ready confidence in every domain.
If you are preparing for AZ-104 and networking is your lowest-scoring domain on practice exams — or if you want to make sure it does not become that — book a free consultation with our team today.
Why is the AZ-104 networking domain so much harder than the other domains? The networking domain tests operational depth — not just understanding of concepts but the ability to reason through configuration scenarios, troubleshoot rule logic, and make correct decisions about which Azure networking service is appropriate for a given requirement. This operational depth cannot be developed through reading alone. It requires hands-on lab work with real Azure configurations, which most candidates either skip or underestimate.
How much time should I spend on networking preparation for AZ-104? Allocate 30 to 40% of your total AZ-104 preparation time to networking specifically. For a candidate spending 80 hours preparing for the exam, that is 24 to 32 hours dedicated to networking — a combination of reading, practice questions, and structured hands-on lab work. This proportion is higher than the domain's exam weighting would suggest, and deliberately so, because the preparation required per mark in this domain is higher than in other domains.
Do I need an Azure subscription to prepare for AZ-104 networking? Yes — effectively. While it is technically possible to pass AZ-104 without hands-on practice, the pass rate for candidates who prepare without lab work is significantly lower for the networking domain specifically. Microsoft offers a free Azure account with $200 in credits for new accounts, which is sufficient to complete the networking lab sequence without incurring costs if resources are cleaned up after each session.
What is the most commonly failed networking topic on AZ-104? NSG priority ordering and VNet peering non-transitivity are the two topics that produce the most incorrect answers on AZ-104 networking questions. Both require operational understanding — knowing the rules is not the same as understanding how those rules behave in multi-service, multi-VNet scenarios.
Is Azure networking harder on AZ-104 than on other Azure exams? AZ-104 tests networking at a greater operational depth than AZ-900 and at a similar depth to AZ-700 for some topics. AZ-700, the Azure Network Engineer Associate certification, goes significantly deeper across all networking topics. For most AZ-104 candidates, the networking domain is the deepest operational content they will have encountered in an Azure exam.
Can I pass AZ-104 networking questions through practice exams alone? Practice exams improve familiarity with question formats and help identify knowledge gaps, but they do not develop the operational reasoning that scenario-based networking questions test. The candidates who score consistently well on AZ-104 networking practice questions and fail the real exam are usually the ones who over-relied on practice exam repetition without doing corresponding lab work.
How is Azure DNS tested on AZ-104? Azure DNS appears in the exam through questions about private DNS zones linked to VNets, auto-registration of VM DNS records, and the resolution of custom domain names for resources within a VNet. Public DNS zones and delegation are also tested. DNS is not the highest-frequency networking topic on AZ-104 but it appears in scenario questions that catch candidates who have only read the definition of the service without building and testing a private DNS zone in a lab environment.
What is the difference between a service endpoint and a private endpoint on AZ-104? Service endpoints extend a VNet's identity to Azure PaaS services over the Azure backbone network, restricting service access to traffic originating from the VNet. Private endpoints place a private IP address from your VNet's address space into the Azure service, making the service reachable at a private address as if it were a resource on your own network. The exam tests both concepts and the scenarios in which each is the appropriate solution — service endpoints are simpler to configure but provide less isolation, while private endpoints offer complete network-level isolation and are appropriate for stricter security requirements.
