Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has two on-premises data centers and an Azure subscription. They need to connect each data center to Azure with a private, high-bandwidth, and reliable connection. They also want a low-cost backup connection for each data center in case the primary connection fails. Which combination of connectivity options should they recommend?
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
Best answer
A
Deploy an ExpressRoute circuit for each data center as the primary connection, and a site-to-site VPN as the backup connection for each. This provides high bandwidth and reliability with a cost-effective failover.
B
Distractor review
B
Using site-to-site VPNs as primary connections may not provide the required high bandwidth and reliability. ExpressRoute circuits as backup would be expensive and not commonly used as a backup due to cost.
C
Distractor review
C
A single Azure VPN Gateway with active-passive configuration is not designed for primary connections from two data centers; it also does not provide the low latency or reliability of ExpressRoute.
D
Distractor review
D
Sharing a single ExpressRoute circuit and a single VPN connection between two data centers is not practical as each data center needs its own connection to Azure.
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 company is designing hub-and-spoke networking. Spoke VNets must use a central Azure Firewall for outbound internet traffic. Which two configurations are required?
Question 2
A company is designing private access to a PaaS database from workloads in a VNet. The database should not be reachable over its public endpoint. What should be recommended?
Question 3
A data platform must support analytical queries over petabytes of files in a data lake, while preserving hierarchical namespaces and fine-grained ACLs. Which storage service should you design around?
Question 4
A database workload has an RPO of 15 minutes and an RTO of 4 hours. Cost is more important than near-zero data loss. Which design is usually more appropriate than synchronous multi-region replication?
Question 5
A hub-and-spoke Azure network must centralize outbound inspection and still allow spokes to resolve private endpoint DNS names. Which two components are commonly required? (Choose 2.)
Question 6
A multinational company uses Microsoft Entra ID and several Azure subscriptions. Security administrators need to review privileged role assignments every month and require justification for continued access. Which design should be recommended?
FAQ
Questions learners often ask
What does this AZ-305 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: A — ExpressRoute provides private, high-bandwidth, and reliable connections from on-premises to Azure. Site-to-Site VPNs over the internet serve as a cost-effective backup because they can be established quickly and incur lower cost. Using two ExpressRoute circuits (one per data center) as primary and site-to-site VPNs as backup ensures high availability and cost efficiency. Using VPNs as primary would not meet the high-bandwidth and reliability requirements.
What should I do if I get this AZ-305 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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