1. What is Linkerd?
A. A container orchestration tool
B. A service mesh for microservices
C. An application firewall
D. A load balancer
Answer: B. A service mesh for microservices
2. What is the primary purpose of a service mesh like Linkerd?
A. Load balancing
B. Service discovery
C. Security and observability for microservices
D. Docker container management
Answer: C. Security and observability for microservices
3. Which programming languages does Linkerd support for microservice development?
A. Java and C#
B. Go and Rust
C. Python and Ruby
D. JavaScript and PHP
Answer: B. Go and Rust
4. What does the term "sidecar proxy" refer to in the context of Linkerd?
A. A service mesh node that handles traffic routing
B. A type of microservice architecture
C. A load balancer used by Linkerd
D. A database used for telemetry data
Answer: A. A service mesh node that handles traffic routing
5. Which protocol is commonly used for communication between Linkerd and microservices?
A. HTTP/1.1
B. gRPC
C. WebSocket
D. UDP
Answer: B. gRPC
6. What is the main purpose of Linkerd's data plane?
A. Load balancing
B. Application security
C. Handling application traffic
D. Service discovery
Answer: C. Handling application traffic
7. Which of the following is NOT a key feature of Linkerd?
A. Automatic TLS encryption
B. Distributed tracing
C. Service discovery
D. Serverless computing
Answer: D. Serverless computing
8. What does the "golden metrics" concept refer to in Linkerd's observability?
A. Metrics that provide critical insights into service performance
B. Metrics related to database performance
C. Metrics for container utilization
D. Metrics for network traffic
Answer: A. Metrics that provide critical insights into service performance
9. Which Linkerd component provides automatic retries and timeouts for service-to-service communication?
A. Prometheus
B. Controller
C. Proxy
D. Dashboard
Answer: C. Proxy
10. Which protocol is commonly used for inter-service communication in Linkerd?
A. HTTP/1.1
B. AMQP
C. FTP
D. RMI
Answer: A. HTTP/1.1
11. Which command is used to install Linkerd on a Kubernetes cluster?
A. kubectl install linkerd
B. linkerdctl install
C. helm install linkerd
D. linkerd install
Answer: B. linkerdctl install
12. What is the primary role of the Linkerd control plane?
A. Handling incoming HTTP requests
B. Managing and configuring Linkerd proxies
C. Storing telemetry data
D. Load balancing traffic
Answer: B. Managing and configuring Linkerd proxies
13. Which tool is commonly used for collecting, processing, and displaying metrics and logs in a Linkerd deployment?
A. Grafana
B. Linkerd Dashboard
C. Wireshark
D. Nginx
Answer: A. Grafana
14. Which Linkerd component is responsible for policy enforcement and routing decisions?
A. Linkerd Dashboard
B. Linkerd Controller
C. Linkerd Proxy
D. Linkerd Telemetry
Answer: B. Linkerd Controller
15. What does the term "service mesh" mean in the context of microservices?
A. A group of microservices that provide a similar service
B. A network of interconnected microservices that handle communication and traffic management
C. A container orchestration platform
D. A microservices architecture pattern
Answer: B. A network of interconnected microservices that handle communication and traffic management
16. Which component of Linkerd is responsible for collecting and exporting telemetry data?
A. Linkerd Proxy
B. Linkerd Control Plane
C. Linkerd Dashboard
D. Linkerd Telemetry
Answer: D. Linkerd Telemetry
17. What is the purpose of "canary deployments" in Linkerd?
A. Deploying microservices in containers
B. Incrementally rolling out new versions of a microservice to a subset of users
C. Deploying all microservices at once
D. Testing microservices in a development environment
Answer: B. Incrementally rolling out new versions of a microservice to a subset of users
18. Which of the following is NOT a valid use case for Linkerd?
A. Service discovery and routing
B. Distributed tracing and monitoring
C. Machine learning model training
D. Load balancing and traffic splitting
Answer: C. Machine learning model training
19. What does Linkerd use to encrypt communication between services?
A. HTTP
B. TLS
C. UDP
D. ICMP
Answer: B. TLS
20. How can Linkerd help with microservices resilience?
A. By isolating microservices from each other
B. By providing automatic retries and timeouts
C. By enforcing strict security policies
D. By using a single proxy for all microservices
Answer: B. By providing automatic retries and timeouts
21. What is Linkerd's primary focus regarding microservices?
A. Microservices development
B. Microservices deployment
C. Microservices communication and observability
D. Microservices monitoring
Answer: C. Microservices communication and observability
22. What is the role of a "service profile" in Linkerd?
A. Describing the service's functionality
B. Authenticating users
C. Managing microservice deployments
D. Configuring the control plane
Answer: A. Describing the service's functionality
23. What does Linkerd use to route traffic to the appropriate service instance?
A. Kubernetes Ingress
B. Linkerd Controller
C. Prometheus
D. Service profiles
Answer: D. Service profiles
24. What is the primary purpose of distributed tracing in Linkerd?
A. Monitoring network traffic
B. Tracing the flow of requests through microservices
C. Authenticating service communication
D. Load balancing traffic
Answer: B. Tracing the flow of requests through microservices
25. Which of the following is NOT a valid communication protocol supported by Linkerd?
A. HTTP/2
B. gRPC
C. WebSocket
D. SNMP
Answer: D. SNMP
26. How does Linkerd help with monitoring and debugging microservices?
A. By providing automatic retries for all requests
B. By using a single proxy for all microservices
C. By collecting and displaying metrics and logs
D. By isolating microservices from each other
Answer: C. By collecting and displaying metrics and logs
27. What is the purpose of "golden signals" in Linkerd's observability?
A. They indicate successful service communication
B. They represent critical performance metrics
C. They are used for security purposes
D. They define service profiles
Answer: B. They represent critical performance metrics
28. Which Linkerd component is responsible for exposing metrics and health information for services?
A. Linkerd Proxy
B. Linkerd Controller
C. Linkerd Telemetry
D. Linkerd Dashboard
Answer: D. Linkerd Dashboard
29. How does Linkerd handle traffic routing in a microservices environment?
A. It uses round-robin load balancing
B. It uses random load balancing
C. It uses circuit breaking
D. It uses static IP addresses
Answer: A. It uses round-robin load balancing
30. What is the primary benefit of mutual Transport Layer Security (mTLS) in Linkerd?
A. It reduces latency in service communication
B. It ensures only authorized services can communicate
C. It increases the number of available proxies
D. It provides load balancing
Answer: B. It ensures only authorized services can communicate
31. What is Linkerd's role in traffic splitting and canary deployments?
A. It doesn't support traffic splitting or canary deployments
B. It provides automatic retries for all traffic
C. It handles all aspects of traffic splitting and canary deployments
D. It integrates with Kubernetes for these purposes
Answer: D. It integrates with Kubernetes for these purposes
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