The correct answer is implementing row-level security in a shared database, paired with tenant isolation at the network layer using VLANs or VPCs. These two approaches balance cost efficiency with strong separation: row-level security ensures that each tenant’s data is logically isolated within a single database schema, while network-layer isolation prevents cross-tenant traffic and limits blast radius. On the CompTIA Cloud+ CV0-004 exam, this question tests your understanding of multi-tenant SaaS design best practices, specifically the trade-off between isolation and operational cost. A common trap is assuming dedicated databases per tenant are always best—they are not, because they scale poorly and drive up costs for many tenants. Another trap is choosing a single large instance for all tenants, which creates a noisy neighbor problem where one tenant’s workload degrades performance for others. Remember the mnemonic “RLN” for Row-level, Layer (network), and No single-instance—these three guide you to the correct pair.
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO are best practices for designing a multi-tenant SaaS application on a public cloud?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use separate virtual networks or VPCs for each tenant
Options A and C are correct. Tenant isolation at the network layer (VLANs or VPCs) and using row-level security in a shared database are common approaches. Option B is wrong because a dedicated database per tenant is costly for many tenants. Option D is wrong because a single large instance for all tenants creates a noisy neighbor problem. Option E is wrong because a tiered service model is a business decision, not a design best practice for multi-tenancy.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Assign a dedicated database instance per tenant
Why it's wrong here
Costly and hard to manage at scale.
✓
Use separate virtual networks or VPCs for each tenant
Why this is correct
Provides network isolation.
Clue confirmation
The clue word "best" in the question point toward this answer.
Deploy all tenants on a single large compute instance
Why it's wrong here
Noisy neighbor and security risks.
✗
Offer the same service tier to all tenants
Why it's wrong here
Not a best practice for multi-tenancy design.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related CV0-004 OSPF questions on adjacency and route selection.
Cloud Architecture and Design — This question tests Cloud Architecture and Design — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Use separate virtual networks or VPCs for each tenant — Options A and C are correct. Tenant isolation at the network layer (VLANs or VPCs) and using row-level security in a shared database are common approaches. Option B is wrong because a dedicated database per tenant is costly for many tenants. Option D is wrong because a single large instance for all tenants creates a noisy neighbor problem. Option E is wrong because a tiered service model is a business decision, not a design best practice for multi-tenancy.
What should I do if I get this CV0-004 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related CV0-004 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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