The answer is the Application Load Balancer (ALB). This is correct because the ALB operates at Layer 7 of the OSI model, allowing it to inspect and route HTTP/HTTPS traffic based on content such as URL path, hostname, and HTTP headers, enabling advanced content-based routing rules like path-based or host-based routing. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of the key difference between load balancer types: the ALB handles application-level routing, while the Network Load Balancer (NLB) handles Layer 4 TCP/UDP traffic. A common trap is confusing the ALB with the Classic Load Balancer, which lacks these content-based routing capabilities. To remember, think of the ALB as the “application-aware” balancer that reads the URL and headers, while the NLB is the “network-speed” balancer that only sees IP and port.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 type of Elastic Load Balancer routes HTTP/HTTPS traffic based on content such as URL path, hostname, and HTTP headers, enabling advanced request routing rules?
Why wrong: NLB operates at Layer 4 (transport) and routes based on TCP/UDP connections — it doesn't inspect HTTP content for content-based routing.
B
Application Load Balancer (ALB)
ALB operates at Layer 7 and supports content-based routing rules for URLs, hostnames, headers, and methods — ideal for microservices and container-based architectures.
C
Gateway Load Balancer (GWLB)
Why wrong: Gateway Load Balancer routes traffic through third-party network appliances (firewalls, IDS/IPS) — it's not for web application content routing.
D
Classic Load Balancer
Why wrong: Classic Load Balancer is legacy and supports limited Layer 7 features — ALB is the current recommendation for HTTP/HTTPS content-based routing.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Application Load Balancer (ALB)
The Application Load Balancer (ALB) operates at Layer 7 of the OSI model and can route HTTP/HTTPS traffic based on request-level attributes such as URL path, hostname, HTTP headers, and query strings. This enables advanced routing rules like path-based routing (e.g., /api to one target group, /images to another) and host-based routing (e.g., app1.example.com vs app2.example.com). ALB also supports features like WebSocket, HTTP/2, and AWS WAF integration, making it the correct choice for content-based routing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Network Load Balancer (NLB)
Why it's wrong here
NLB operates at Layer 4 (transport) and routes based on TCP/UDP connections — it doesn't inspect HTTP content for content-based routing.
✓
Application Load Balancer (ALB)
Why this is correct
ALB operates at Layer 7 and supports content-based routing rules for URLs, hostnames, headers, and methods — ideal for microservices and container-based architectures.
Related concept
Read the scenario before looking for a memorised answer.
✗
Gateway Load Balancer (GWLB)
Why it's wrong here
GatewayLoad Balancer routes traffic through third-party network appliances (firewalls, IDS/IPS) — it's not for web application content routing.
✗
Classic Load Balancer
Why it's wrong here
Classic Load Balancer is legacy and supports limited Layer 7 features — ALB is the current recommendation for HTTP/HTTPS content-based routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Network Load Balancer (NLB) with the Application Load Balancer (ALB) because both can handle HTTPS traffic, but NLB cannot inspect HTTP/HTTPS content for routing decisions—it only forwards TCP traffic, making ALB the only correct answer for content-based routing.
Detailed technical explanation
How to think about this question
Under the hood, ALB uses listener rules that are evaluated in priority order, allowing you to define conditions based on path patterns (e.g., /user/*), host headers (e.g., *.example.com), HTTP methods, query strings, and source IPs. A subtle behavior is that ALB terminates the client's TLS connection and then establishes a new TLS connection to the target, which means you can offload SSL/TLS processing and inspect decrypted traffic for routing decisions. In a real-world microservices architecture, ALB enables you to route requests to different services (e.g., /orders to an order service, /payments to a payment service) without needing a separate load balancer per service.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CLF-C02 question in full detail.
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Application Load Balancer (ALB) — The Application Load Balancer (ALB) operates at Layer 7 of the OSI model and can route HTTP/HTTPS traffic based on request-level attributes such as URL path, hostname, HTTP headers, and query strings. This enables advanced routing rules like path-based routing (e.g., /api to one target group, /images to another) and host-based routing (e.g., app1.example.com vs app2.example.com). ALB also supports features like WebSocket, HTTP/2, and AWS WAF integration, making it the correct choice for content-based routing.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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