System Design
15 questions — answer mentally, then read the explanations
What you'll learn
- Try to answer each question before reading the explanation
- Cover System Design topics in system design
Questions
Read each question and options, then check the explanation below.
A social media platform requires real-time updates and notifications. Discuss how application servers can facilitate this functionality while maintaining responsiveness and scalability.
- A. Implementing a publish-subscribe messaging system
- B. Sending individual API requests for each notification
- C. Using a single centralized server for all updates
- D. Caching all notifications on the client side
Explanation
Answer: Implementing a publish-subscribe messaging system Application servers can facilitate real-time updates and notifications by implementing a publish-subscribe messaging system. This allows servers to push updates to subscribed clients efficiently, ensuring responsiveness and scalability for a social media platform.
In a scenario where a banking application needs to ensure high security and transaction integrity, describe how application servers can be configured to meet these requirements.
- A. Implementing secure communication protocols like HTTPS
- B. Regularly restarting servers to prevent security vulnerabilities
- C. Running servers with elevated user privileges
- D. Disabling encryption to improve performance
Explanation
Answer: Implementing secure communication protocols like HTTPS Application servers can be configured for high security and transaction integrity by implementing secure communication protocols like HTTPS. This ensures encrypted data transmission, protecting sensitive information and maintaining the integrity of transactions.
In a scenario where an e-commerce website experiences a sudden surge in traffic, explain how application servers can dynamically scale to handle the increased load while ensuring performance and availability.
- A. Load balancing and auto-scaling based on metrics such as CPU usage and request rates
- B. Manually allocating additional servers
- C. Adding more storage to existing servers
- D. Increasing network bandwidth
Explanation
Answer: Load balancing and auto-scaling based on metrics such as CPU usage and request rates Application servers can dynamically scale by implementing load balancing and auto-scaling mechanisms. These systems monitor metrics like CPU usage and request rates, automatically provisioning or de-provisioning servers to handle varying loads and ensure optimal performance and availability.
Implementing _________ allows application servers to efficiently manage database connections and improve performance.
- A. Connection Pooling
- B. Distributed Transactions
- C. Data Sharding
- D. Replication
Explanation
Answer: Connection Pooling Connection Pooling is a technique that enables application servers to efficiently manage and reuse database connections. This optimizes resource utilization and enhances overall system performance.
_________ is a common protocol used for inter-process communication between web servers and application servers.
- A. HTTP
- B. TCP/IP
- C. WebSocket
- D. FastCGI
Explanation
Answer: FastCGI FastCGI (Fast Common Gateway Interface) is a protocol facilitating efficient communication between web servers and application servers. It enhances performance by maintaining persistent connections.
One of the key advantages of using an application server is its ability to provide _________, ensuring consistent behavior across different client platforms.
- A. Load Balancing
- B. Connection Pooling
- C. Abstraction
- D. Fault Tolerance
Explanation
Answer: Abstraction Abstraction is a key advantage of using an application server. It allows developers to interact with a consistent interface, shielding them from the complexities of different client platforms and ensuring uniform behavior.
_________ is a mechanism employed by application servers to ensure fault tolerance by automatically redirecting requests in case of server failure.
- A. Load Balancing
- B. Failover Clustering
- C. Circuit Breaker
- D. Retry Mechanism
Explanation
Answer: Failover Clustering Failover Clustering is a mechanism used by application servers to ensure fault tolerance. It automatically redirects requests to a backup server in case of a primary server failure, enhancing system reliability.
What role does an application server play in a client-server architecture?
- A. It handles user authentication and authorization
- B. It processes business logic and manages application data
- C. It serves static files and web pages
- D. It manages network communication
Explanation
Answer: It processes business logic and manages application data In a client-server architecture, an application server plays a crucial role by processing business logic and managing application data. It acts as a middleware between the client and the database.
What is session management in the context of application servers?
- A. Handling user authentication
- B. Managing user interactions during a specific time period
- C. Controlling access to database sessions
- D. Maintaining server logs
Explanation
Answer: Managing user interactions during a specific time period Session management involves managing user interactions during a specific time period, ensuring continuity and security during a user's visit to an application. It includes handling user authentication and maintaining session state.
Which protocol is commonly used for communication between web servers and application servers?
- A. HTTP
- B. FTP
- C. TCP
- D. FastCGI
Explanation
Answer: FastCGI FastCGI (Fast Common Gateway Interface) is commonly used for communication between web servers and application servers. It provides a high-performance interface for dynamic web applications.
How do application servers differ from web servers in terms of functionality and usage?
- A. Web servers handle static content and HTTP requests, while application servers execute dynamic code and manage business logic.
- B. Application servers focus on serving static web pages, while web servers manage the application's business logic.
- C. Both web servers and application servers perform the same functions, but application servers are more scalable.
- D. Web servers are only used for development purposes, while application servers are used in production environments.
Explanation
Answer: Web servers handle static content and HTTP requests, while application servers execute dynamic code and manage business logic. Application servers and web servers have distinct roles. Web servers handle static content and HTTP requests, while application servers execute dynamic code and manage business logic, dealing with application-specific processes.
How does clustering of application servers contribute to scalability and availability?
- A. Distributes incoming requests among multiple servers
- B. Consolidates all requests on a single server
- C. Randomly redirects requests to any server
- D. Assigns requests based on server load
Explanation
Answer: Distributes incoming requests among multiple servers Clustering application servers involves distributing incoming requests among multiple servers. This enhances scalability by allowing the system to handle more requests collectively and increases availability by providing redundancy.
What are some common security features provided by application servers?
- A. Authentication, Authorization, and Encryption
- B. Compression, Caching, and Load Balancing
- C. Routing, Logging, and Error Handling
- D. Load Balancing, Virtualization, and Monitoring
Explanation
Answer: Authentication, Authorization, and Encryption Common security features provided by application servers include Authentication (verifying user identity), Authorization (granting access rights), and Encryption (securing data transmission). These features are essential for protecting applications and data.
What role do connection pools play in optimizing the performance of application servers?
- A. Manage and reuse database connections to reduce overhead
- B. Monitor server CPU usage for optimal resource allocation
- C. Automatically scale server capacity based on demand
- D. Encrypt data during transmission for enhanced security
Explanation
Answer: Manage and reuse database connections to reduce overhead Connection pools optimize performance by managing and reusing database connections. This reduces the overhead of opening and closing connections, enhancing the efficiency of application servers in handling database interactions.
_________ is a technique used by application servers to manage multiple client sessions.
- A. Load Balancing
- B. Connection Pooling
- C. Caching
- D. Encryption
Explanation
Answer: Connection Pooling Connection pooling is a technique used by application servers to manage multiple client sessions efficiently. It involves reusing existing database connections, reducing the overhead of opening and closing connections for each client.
Today's exercise: Review & recall
Revisit any questions you hesitated on. Write one-line answers in your own words.
Steps
- 1
First pass
Read each question and pick an answer without looking at the explanation.
- 2
Second pass
Expand explanations only for questions you missed or were unsure about.
- 3
Notes
Jot down 3 terms or patterns you want to remember from this batch.
