Download CTAD Certified TARS Application Developer Practice Exam and more Exams Technology in PDF only on Docsity!
Practice Exam
Question 1. Which architectural style describes a single, indivisible application that runs as one process? A) Microservices B) Monolithic C) Service‑Oriented Architecture D) Event‑Driven Architecture Answer: B Explanation: A monolithic architecture bundles all functionality into a single deployable unit, unlike microservices which split functionality into independent services. Question 2. What is the primary benefit of adopting a microservices architecture? A) Simplified database schema design B) Reduced network latency C) Independent scaling of services D) Elimination of inter‑service communication Answer: C Explanation: Microservices enable each service to be scaled independently based on its own load, improving resource utilization. Question 3. In TARS, which component is responsible for storing service metadata and providing discovery services? A) TARS Node B) TARS Registry C) TARS Admin D) TARS Web Answer: B
Practice Exam
Explanation: The TARS Registry maintains service registration information so that clients can locate service instances. Question 4. Which TARS component offers a graphical interface for deploying and managing services? A) TARS Node B) TARS Registry C) TARS Admin D) TARS Web Answer: D Explanation: TARS Web provides a web‑based UI for service packaging, deployment, and monitoring. Question 5. What file format does the TARS Interface Description Language (IDL) use to define service interfaces? A) JSON B) XML C) .tars (plain text) D) YAML Answer: C Explanation: TARS IDL files have a .tars extension and contain plain‑text definitions of structs, enums, and service methods. Question 6. After writing a .tars file, which tool generates the language‑specific service skeletons? A) tars2go B) tars2java
Practice Exam
A) LXC
B) Docker C) rkt D) Singularity Answer: B Explanation: Docker containers are commonly used to package and run TARS services, enabling consistent deployment. Question 10. In a Kubernetes deployment, which object typically represents a TARS service instance? A) ConfigMap B) StatefulSet C) Deployment D) Ingress Answer: C Explanation: A Deployment manages replica pods for a TARS service, handling scaling and rolling updates. Question 11. Which command sequence correctly packages a TARS service for upload via TARS Web? A) tars2go → tar - czf service.tar.gz → upload B) make package → tars upload C) tars package → tars push D) tars2cpp → mvn install → upload Answer: A
Practice Exam
Explanation: After generating code with tars2go (or other language compiler), the service directory is archived (tar - czf) and uploaded through the web UI. Question 12. What does a “service instance” refer to in TARS deployment terminology? A) A unique method within a service B) A running process of a service on a node C) A version of the IDL file D) A configuration template file Answer: B Explanation: An instance is an actual running process of a service, possibly replicated across multiple nodes. Question 13. Which protocol does TARS use by default for RPC communication? A) HTTP/1. B) gRPC C) TARS binary protocol over TCP D) WebSocket Answer: C Explanation: TARS defines its own binary protocol that runs over TCP for efficient RPC calls. Question 14. When would you choose TARS‑HTTP over the default TARS protocol? A) When low latency is critical B) When interacting with browsers or REST clients C) When using UDP transport D) When encryption is not required
Practice Exam
D) TARS Monitor Answer: B Explanation: The Registry maintains a directory of services and their endpoints for discovery. Question 18. What parameter controls the maximum number of concurrent connections a TARS Node can maintain? A) maxThreadNum B) maxConnectionNum C) threadPoolSize D) connTimeout Answer: B Explanation: maxConnectionNum defines the upper bound of simultaneous client connections a node accepts. Question 19. Which configuration file typically contains global settings for all TARS services on a node? A) application.conf B) server.conf C) tars.conf D) common.conf Answer: C Explanation: tars.conf (or tars.conf under the TARS installation) holds node‑wide defaults applied to all services. Question 20. In TARS, what is the purpose of a configuration template? A) To generate code skeletons
Practice Exam
B) To define reusable parameter sets for multiple services C) To store logs D) To register services with the registry Answer: B Explanation: Templates allow administrators to define common settings that can be applied across many services, simplifying management. Question 21. Which hierarchy level has the highest precedence when resolving a configuration key? A) Global level B) Application level C) Server level D) Service instance level Answer: D Explanation: Instance‑specific configuration overrides server, application, and global settings, following a bottom‑up precedence. Question 22. What feature does “dyeing log” provide in TARS? A) Automatic log rotation B) Coloring logs based on severity C) Tagging logs with a request ID for end‑to‑end tracing D) Encrypting log files at rest Answer: C Explanation: Dyeing logs attach a unique identifier to all log entries generated during a specific request, facilitating cross‑service debugging.
Practice Exam
Explanation: The TARS Web UI provides a dashboard where live metrics for each service are displayed. Question 26. Which load‑balancing strategy distributes requests based on the least number of active connections? A) Round Robin B) Random C) Least Active D) Weighted Hash Answer: C Explanation: “Least Active” selects the instance with the fewest ongoing calls, balancing load dynamically. Question 27. In TARS, what does the “Name Service” primarily provide? A) DNS resolution for external domains B) Mapping of logical service names to physical endpoints C) SSL certificate management D) Centralized logging Answer: B Explanation: The Name Service (part of the Registry) resolves logical service identifiers to concrete network addresses. Question 28. Which configuration element defines custom routing rules for a TARS service? A) route.conf B) router.xml C) routing.yml
Practice Exam
D) router.conf Answer: D Explanation: router.conf allows administrators to specify how calls are routed among service instances. Question 29. What is the primary purpose of a circuit breaker in TARS? A) To encrypt traffic between services B) To prevent cascading failures by opening the circuit after repeated errors C) To balance load across regions D) To cache responses for faster retrieval Answer: B Explanation: A circuit breaker monitors failure rates; once a threshold is exceeded, it short‑circuits calls to protect the system. Question 30. Which parameter controls the failure threshold for a TARS circuit breaker? A) failureRateThreshold B) errorCountLimit C) circuitOpenTime D) maxRetryTimes Answer: A Explanation: failureRateThreshold specifies the percentage of failed calls that triggers the circuit to open. Question 31. In multi‑region deployments, what does IDC stand for? A) Inter‑Data Cache B) Internet Data Center
Practice Exam
A) TARS Registry B) TARS Node C) A third‑party library such as HikariCP embedded in the service code D) TARS Admin Answer: C Explanation: Connection pooling is managed by a library within the service (e.g., HikariCP for Java), not by TARS core components. Question 35. Which storage option is recommended for persisting files uploaded by a TARS service in a Docker environment? A) Bind mount a host directory B) Use a Docker volume C) Store in the container’s writable layer D) Write to /tmp inside the container Answer: B Explanation: Docker volumes provide persistent, managed storage that remains across container restarts. Question 36. Which tool is used to perform load testing specifically for TARS services? A) JMeter B) TarsJMeter C) Gatling D) Locust Answer: B Explanation: TarsJMeter is a customized version of JMeter that understands TARS protocols for realistic load testing.
Practice Exam
Question 37. What does the TarsBenchmark tool primarily measure? A) Network latency between nodes B) CPU utilization of the host C) Fine‑grained RPC latency and throughput of a single method D) Disk I/O performance Answer: C Explanation: TarsBenchmark focuses on detailed performance metrics of TARS RPC calls, such as per‑method latency. Question 38. In the TARS Web interface, which feature allows developers to invoke a method and view the response without writing client code? A) Service Explorer B) Interface Debugger C) API Tester D) Call Simulator Answer: B Explanation: The Interface Debugger lets users send requests to a service method and inspect the returned data directly. Question 39. If a TARS service returns “service not found” during a client call, which of the following is the most likely cause? A) Network firewall blocking TCP port B) The service has not been registered in the Registry C) The client’s IDL version is outdated D) The service’s logging level is too low
Practice Exam
B) router.conf C) tars.conf D) balancer.xml Answer: A Explanation: loadbalance.conf defines the strategies (e.g., round robin, least active) that the framework may apply. Question 43. What is the effect of setting enableDyeing to true in a service’s configuration? A) All logs are automatically colored B) The service begins to accept a special dyeing request header to trace a specific request C) Log files are compressed on the fly D) The service disables remote logging to reduce overhead Answer: B Explanation: Enabling dyeing allows the service to recognize a dyeing key in incoming calls and tag all related logs. Question 44. Which of the following best describes “centralized configuration management” in TARS? A) Each service reads its own local config file only B) Configurations are stored in a shared repository and pushed to nodes at runtime C) Configuration is hard‑coded in source code D) Config files are duplicated across all nodes manually Answer: B Explanation: Centralized management means a single source (e.g., a config server) distributes settings to all services, simplifying updates.
Practice Exam
Question 45. When deploying a TARS service in Kubernetes, which resource should be used to expose the service outside the cluster? A) ConfigMap B) Service of type LoadBalancer or NodePort C) PersistentVolumeClaim D) DaemonSet Answer: B Explanation: A Kubernetes Service of type LoadBalancer (or NodePort) creates an external endpoint for client access. Question 46. What is the purpose of the tars.tarsregistry environment variable in a Docker container? A) To specify the Docker image name B) To indicate the address of the TARS Registry for service registration C) To set the logging level D) To define the maximum number of threads Answer: B Explanation: tars.tarsregistry tells the container where the Registry resides so the service can register itself. Question 47. Which command line option starts a TARS Node in debug mode, printing detailed startup information? A) --debug B) -D C) --verbose
Practice Exam
C) Average response time per method graph D) CPU usage chart of the host Answer: C Explanation: The average response time per method directly shows which RPC is slowing down, aiding diagnosis. Question 51. Which setting controls the maximum number of pending requests a TARS service can queue before rejecting new calls? A) queueSize B) maxPendingRequests C) requestBufferSize D) backlog Answer: B Explanation: maxPendingRequests defines the limit of inflight requests; exceeding it leads to rejection or timeout. Question 52. What is the effect of enabling “remote logging” in a TARS service configuration? A) Logs are written to a local file only B) Logs are sent to a centralized LogServer for aggregation C) Logs are encrypted and stored in the database D) Logging is disabled to improve performance Answer: B Explanation: Remote logging forwards log entries to a LogServer, enabling centralized collection and analysis.
Practice Exam
Question 53. Which of the following best describes a “service instance group” in TARS? A) A collection of methods belonging to a service B) Multiple replicas of the same service running on different nodes C) A set of configuration templates D) The admin console users Answer: B Explanation: An instance group aggregates all active replicas of a service for load balancing and failover. Question 54. In TARS, which file typically defines the network ports a service will listen on? A) server.conf B) port.cfg C) network.ini D) service.yaml Answer: A Explanation: server.conf contains the listenPort attribute specifying the TCP port for the service. Question 55. If a TARS client receives a “serialization error”, what is the most probable cause? A) Network cable unplugged B) Mismatch between client and server IDL definitions (e.g., missing field) C) High CPU usage on the server D) Incorrect logging level Answer: B
