Common Traps on Router R1 Cannot Reach R3 Practice Questions
- ·Check both forward and return paths.
- ·A correct-looking route can still fail if the next hop is unreachable.
- ·Administrative distance and longest-prefix match can change which route is used.
Sample Questions
Practice all 8 →A company has two Azure virtual networks: VNet-A in the East US region and VNet-B in the West US region. Both virtual networks use non-overlapping IP address spaces and are deployed in different resource groups. The company needs to enable communication between resources in VNet-A and VNet-B using private IP addresses only, with low latency and without any traffic traversing the public internet. The solution must not require deploying a virtual network gateway or any additional network appliance. Which Azure service should the company use?
Explanation: Azure Virtual Network peering connects two Azure virtual networks privately using the Microsoft backbone network. It allows resources in each VNet to communicate directly via private IP addresses with low latency, no gateways, and no internet transit. This matches the requirements: different regions, non-overlapping IPs, no gateway, private connectivity.
A company deploys a web application on Azure App Service. During a marketing campaign, they expect traffic to double. The app uses a Standard tier App Service plan. They want to ensure that the additional load is handled without performance degradation while keeping costs minimal. Which action should they take?
Explanation: App Service plans can be scaled out by increasing the number of VM instances (scale out) or scaled up by moving to a larger plan (scale up). Scaling out is generally more cost-effective for handling variable load as you can add instances and remove them as needed. The Standard tier supports manual scale out (or autoscale). The Premium tier is more expensive. Autoscale is a feature of the plan but requires configuration. The correct immediate action for minimal cost is to manually scale out the app by increasing instance count, or configure autoscale to handle the expected traffic. However, the best answer among the options is to scale out the plan by increasing the number of instances (option A). Option B (scale up to Premium) increases cost unnecessarily, option C (enable autoscale) requires an upfront configuration but not an action to handle immediate doubling, option D (add a CDN) improves latency but does not increase compute capacity.
A company is developing a new web application. The development team wants to deploy the application code without having to manage the underlying virtual machines, operating systems, or runtime environments. They only want to focus on writing code and let the cloud provider handle the infrastructure, platform, and scaling automatically. Which cloud service model does this scenario describe?
Explanation: Platform as a Service (PaaS) provides a managed platform that includes the operating system, runtime, and middleware. Developers can deploy their code without managing the underlying infrastructure. PaaS abstracts the hardware and OS layer, allowing automatic scaling and reduced administrative overhead. Infrastructure as a Service (IaaS) gives users control over virtual machines and operating systems, which is not what the team wants. Software as a Service (SaaS) provides ready-to-use applications accessed via a browser. Function as a Service (FaaS) is a serverless compute model for individual functions, not typically for full web applications, and still requires a platform (often PaaS) underneath.
A company is developing a REST API that processes incoming HTTP requests. The API usage is highly unpredictable; sometimes it receives thousands of requests per minute, and at other times it receives zero requests for hours. The company wants to pay only for the compute time consumed when the API code is actually executing. They also want Microsoft to automatically handle scaling and maintenance of the underlying server infrastructure. Which Azure compute service should the company use?
Explanation: Azure Functions with a Consumption plan is the correct choice because it is a serverless compute service that runs code only when triggered by events (like HTTP requests). It automatically scales out based on demand and charges only for the execution time and resources used, with no cost when the function is idle. Other services either run continuously (App Service, Container Instances) or are designed for different scenarios (Logic Apps).
A company is developing a web application that will be deployed to Azure App Service. The application experiences unpredictable spikes in traffic, and the company wants the number of instances to automatically increase during high demand and decrease during low demand to optimize costs. The company also needs to use a custom domain name and ensure the application is accessible over HTTPS. Which App Service plan tier should the company choose?
Explanation: Azure App Service offers several plan tiers: Free, Shared, Basic, Standard, Premium, and Isolated. The Free and Shared tiers are intended for development and testing only; they do not support custom domains (Free) or SSL (Shared), and neither supports autoscaling. The Basic tier supports custom domains and SSL (with SNI) but only allows manual scaling, not automatic scaling. Standard and higher tiers (Premium, Isolated) support both custom domains with SSL and automatic scaling (autoscale). The requirement for automatic scaling and HTTPS with a custom domain makes the Standard tier the minimum appropriate choice. The Premium tier would also work but is more expensive and not strictly needed based on the requirements stated.
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Frequently asked questions
How do "Router R1 Cannot Reach R3 Practice Questions" appear on the real AZ-900?
Practise routing and connectivity troubleshooting scenarios involving R1, R2, R3, static routes, OSPF, next hops and routing tables. These appear throughout the AZ-900 and require you to apply your knowledge, not just recall facts.
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Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the AZ-900. Practicing each scenario type ensures you're ready for any format.
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