SY0-701 Security Architecture Practice Question
An online retailer is moving its public web app, internal API, and database into separate zones. Public users must reach only the web tier. The web tier must contact the app tier, and only the app tier may query the database. Admins should manage all servers from a hardened jump host. Which design best meets these goals and minimizes lateral movement?
⚠ Common exam trap
Test-takers frequently assume placing the database in the DMZ simplifies connectivity, but this violates the principle of defense in depth by removing network segmentation between the web tier and sensitive data storage.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create separate DMZ, application, and database zones with default-deny east-west rules and use a jump host for administration.
It implements a multi-tier network architecture with separate DMZ, application, and database zones, enforcing default-deny east-west traffic rules. This ensures that public users can only reach the web tier, the web tier can only communicate with the app tier, and only the app tier can query the database, while all administrative access is funneled through a hardened jump host, which minimizes lateral movement by restricting inter-zone traffic to only what is explicitly required.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Place all servers in one VLAN and rely on host-based firewalls to block unwanted traffic.
Why it's wrong here
Relying solely on host-based firewalls within a single VLAN fails to enforce network segmentation, so an attacker who compromises the web server can still perform lateral movement to the app or database tier by ARP spoofing or exploiting a misconfigured firewall rule, because all servers share the same broadcast domain. This approach is tempting because host-based firewalls are a valid defence-in-depth measure for restricting inter-process communication on a single host, and in a flat network where all traffic is already trusted, they would be the correct choice for granular per-service access control.
- ✓
Create separate DMZ, application, and database zones with default-deny east-west rules and use a jump host for administration.
Why this is correct
Placing web, application, and database appliances into separate security zones with default-deny east-west rules enforces a least-privilege network. The DMZ only exposes the public-facing web tier; the application zone is not directly reachable from the Internet, and the database zone accepts connections solely from the application subnet. A jump host (bastion) centralizes administrative access from a hardened, auditable entry point, preventing direct management of sensitive tiers from unsecured networks. This tiered design contains a successful web-server compromise, as later moves to the application or database zones are blocked unless explicitly allowlisted.
- ✗
Put the database in the DMZ so the web tier can connect to it without extra firewall rules.
Why it's wrong here
Inserting the database into the DMZ defeats the purpose of a layered perimeter, because the DMZ is specifically semi-trusted and directly reachable from public networks. Even though a firewall rule might restrict which source IPs can reach the database, the database now resides in the same exposure zone as the web server, so a single compromise of any DMZ host provides immediate lateral access to sensitive data. The convenience of fewer firewall rules is heavily outweighed by the increased blast radius, and it directly violates the principle of placing least-trusted data components in the least-exposed zone. This design also eliminates the isolation required by most compliance frameworks, such as PCI DSS, which mandate database systems be separated from the DMZ.
- ✗
Expose the application tier to the Internet and use NAT to hide the database subnet.
Why it's wrong here
NAT is a routing technique that translates private addresses to public ones; it performs no inspection and applies no access-control policy, so it does not constitute network segmentation. Exposing the application tier directly to the Internet enlarges the attack surface by making business logic reachable by any remote attacker, whereas an application tier should sit behind the web/DMZ tier and only receive proxied requests. If the application tier is compromised, the NAT 'hiding' the database subnet is irrelevant because the attacker already has an internal foothold and can route laterally to the database without traversing the NAT boundary. The correct control is a firewall rule that allows only the application service's account to reach the database's specific port, not rely on address translation.
Go deeper
Related to this question
Learn chapter
Network Segmentation and Isolation
Key term
Lateral movement
Lateral movement is the technique attackers use to move through a network from one compromised system to another, seeking sensitive data or higher privileges.
Key term
DMZ
A DMZ (demilitarized zone) is a network segment that sits between an internal private network and the public internet, hosting publicly accessible services while keeping the internal network isolated.
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Same concept, more angles
3 more ways this is tested on SY0-701
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A small enterprise is rebuilding its public customer portal. The web front end must be reachable from the internet, the application tier should never be directly exposed, and the database must remain private even if the web server is compromised. Which two design changes best meet those goals? Select two.
medium- ✓ A.Place the web front end in a DMZ behind a firewall rule allowing only HTTPS from the internet.
- B.Put the database on the same subnet as the web front end so internal calls have lower latency.
- ✓ C.Place the application tier on an internal subnet and allow only the web front end to reach it on the app port.
- D.Allow the database to accept connections from the internet if strong passwords are used.
- E.Disable all inbound filtering on the DMZ so troubleshooting is simpler.
Why A: Placing the web front end in a DMZ behind a firewall rule that permits only HTTPS (TCP/443) from the internet ensures the public-facing component is isolated from internal networks. This design prevents direct inbound access to the application or database tiers, reducing the attack surface while still allowing legitimate web traffic.
Variation 2. An online retailer is redesigning a network for a public web app. Customers must reach only the web tier from the internet. The web tier must reach the application tier, and the application tier must reach the database tier. Which two design changes best support this zoning model? Select two.
medium- A.Place all three server tiers on the same flat VLAN and rely on host firewalls.
- ✓ B.Put the internet-facing web tier in a DMZ with tightly filtered inbound rules.
- C.Give the database server a public IP address so the web tier can connect faster.
- ✓ D.Place the application and database tiers in separate internal zones with firewall allow-lists between them.
- E.Use a single NAT device for all servers and disable interserver filtering.
Why B: Placing the internet-facing web tier in a DMZ (demilitarized zone) with tightly filtered inbound rules ensures that external users can only reach the web servers, while the DMZ network isolates them from internal tiers. This aligns with the principle of defense in depth, where the DMZ acts as a buffer zone, and inbound rules (e.g., allowing only TCP/443 for HTTPS) minimize the attack surface. The web tier can then initiate outbound connections to the application tier through a firewall with specific allow-lists, maintaining strict segmentation.
Variation 3. A hospital is redesigning its wireless network. Guest devices must reach only the internet. Staff laptops need access to internal applications. Medical devices must communicate with a monitoring server but never with guest devices or the broader employee LAN. What design best meets these goals with the least operational complexity?
medium- A.Place all devices on one flat network and rely on endpoint antivirus for protection.
- ✓ B.Create separate VLANs for guest, staff, and medical devices, then enforce traffic rules between them with firewall policies.
- C.Use a single wireless SSID with client isolation enabled and NAT all traffic through one gateway.
- D.Deploy network access control only at login time and allow all devices onto the same internal subnet afterward.
Why B: VLANs logically segment the network into isolated broadcast domains for guest, staff, and medical devices, while firewall policies (e.g., using ACLs or stateful inspection) enforce granular traffic rules. This design ensures medical devices can only communicate with the monitoring server, guests are restricted to internet-only access, and staff can reach internal applications, all without requiring complex physical reconfiguration.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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