Quick Answer
The answer is a service registry like Consul, which is the correct technology for enabling dynamic service discovery in microservices without hardcoded IP addresses. A service registry acts as a centralized directory where each microservice registers its network location—IP and port—along with health status, allowing other services to query the registry to discover available instances at runtime. This eliminates brittle, static configurations and supports resilience through automated health checks and failover. On the Cisco DevNet Associate 200-901 exam, this concept tests your understanding of microservices communication patterns and infrastructure automation, often appearing in questions about containerized deployments or API gateway integration. A common trap is confusing DNS-based discovery with a dedicated registry—remember that Consul, etcd, or Zookeeper provide richer health monitoring and dynamic updates than simple DNS. Memory tip: think of a service registry as a phone book for microservices—services “call in” their number, and others “look up” the current listing.
This 200-901 practice question tests your understanding of software development 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.
A development team is implementing a microservices architecture. They need to ensure that services can discover each other dynamically without hardcoding IP addresses. Which technology should they use?
A centralized load balancer
Why wrong: Incorrect: Load balancers do not provide dynamic service discovery.
A service registry like Consul
Correct: Service registries enable dynamic discovery and health checks.
An API gateway
Why wrong: Incorrect: API gateways can use registries but are not the discovery mechanism themselves.
DNS-based service discovery
Why wrong: Incorrect: DNS is not dynamic enough for microservices.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A service registry like Consul
A service registry like Consul provides a centralized directory where microservices register their network locations (IP and port) and health status. Other services query the registry to discover available instances dynamically, eliminating the need for hardcoded addresses. Consul supports health checks, multi-datacenter replication, and integrates with tools like Envoy for service mesh functionality.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
A centralized load balancer
Why it's wrong here
Incorrect: Load balancers do not provide dynamic service discovery.
A service registry like Consul
Why this is correct
Correct: Service registries enable dynamic discovery and health checks.
Related concept
Read the scenario before looking for a memorised answer.
An API gateway
Why it's wrong here
Incorrect: API gateways can use registries but are not the discovery mechanism themselves.
DNS-based service discovery
Why it's wrong here
Incorrect: DNS is not dynamic enough for microservices.
Common exam traps
Cisco often tests the distinction between an API gateway (which handles external traffic) and a service registry (which handles internal service discovery), leading candidates to incorrectly choose the API gateway when the question focuses on inter-service communication.
Detailed technical explanation
Service registries like Consul use the Raft consensus protocol for strong consistency across nodes, ensuring that registration and health data are reliable even during partitions. In a microservices environment, services typically register via an agent running on each host, which performs periodic health checks (e.g., HTTP, TCP, or script-based) and deregisters unhealthy instances automatically. This pattern is foundational to the 'service mesh' architecture, where sidecar proxies (e.g., Envoy) use the registry for dynamic load balancing and circuit breaking.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
The correct answer is: A service registry like Consul — A service registry like Consul provides a centralized directory where microservices register their network locations (IP and port) and health status. Other services query the registry to discover available instances dynamically, eliminating the need for hardcoded addresses. Consul supports health checks, multi-datacenter replication, and integrates with tools like Envoy for service mesh functionality.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.
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