Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
After applying a custom image, a VM boots to a black screen with a blinking cursor. The OS never reaches the login prompt. The administrator needs the fastest way to inspect the boot process and view serial console output. What should be enabled or checked?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Azure Monitor metrics for the VM
Metrics can show resource usage trends, but they do not reveal early boot messages or OS startup output.
B
Best answer
Boot diagnostics
Boot diagnostics is the quickest way to review startup problems because it captures the VM screenshot and serial console output during the boot process. When the operating system is not reaching the login screen, this feature helps identify whether the failure happens before the guest OS loads successfully.
C
Distractor review
Network watcher packet capture
Packet capture is useful for network troubleshooting, but this problem occurs before the VM reaches a usable OS state.
D
Distractor review
Azure Advisor recommendations
Advisor can suggest optimization and reliability improvements, but it does not provide real-time boot evidence for a failed startup.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Boot diagnostics — Boot diagnostics is the right tool because the VM is failing before it reaches the login prompt. In that situation, administrators need access to the screenshot and serial console output to see what is happening during startup. Boot diagnostics gives visibility into early OS boot issues, which is much faster than trying to troubleshoot from the guest OS or from generic performance tools. It is a standard first step for startup failures on Azure VMs. Why others are wrong: Azure Monitor metrics are valuable after the VM is running, but they do not show the boot sequence. Network packet capture is too late in the troubleshooting path for a machine that never completes startup. Azure Advisor is advisory and not a live diagnostic tool for boot failures.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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