In cloud environments, _________ scaling refers to the automated process of adding or removing resources as needed.
- Elastic
- Horizontal
- Static
- Vertical
In cloud environments, Horizontal scaling refers to the automated process of adding or removing resources as needed, also known as scaling out or in.
An e-commerce website uses auto-scaling but faces downtime during sudden traffic spikes. What might be missing in their scaling strategy?
- Inadequate Database Scaling
- Inefficient Caching Strategy
- Insufficient Monitoring and Alerting
- Lack of Horizontal Scaling
Downtime during traffic spikes suggests a possible lack of horizontal scaling, where the application fails to dynamically add more instances to handle increased load. Monitoring and alerting can help detect such issues early.
What is the basic difference between horizontal scaling and vertical scaling?
- Distributing traffic
- Increasing resources on a server
- Increasing servers
- Load balancing
The basic difference is that horizontal scaling increases the number of servers to handle increased load, while vertical scaling involves increasing the resources (CPU, RAM) on a single server.
Which load balancing algorithm distributes requests based on the server with the least connections?
- Least Connections
- Random
- Round Robin
- Weighted Round Robin
The load balancing algorithm that distributes requests based on the server with the least connections is known as the Least Connections algorithm.
In the context of web applications, what does the term 'sticky session' mean?
- A session that retains client affinity
- A session with a fixed duration
- A session with persistent data
- A session with secure connections
'Sticky session' refers to a session that retains client affinity, meaning requests from the same client are directed to the same server, enhancing user experience in stateful applications.
What is a common challenge when scaling stateful applications?
- Caching
- Data consistency
- Load balancing
- Stateless communication
Achieving Data consistency is a common challenge when scaling stateful applications, as it involves ensuring that data is synchronized across multiple instances of the application.
How does a distributed cache enhance the scalability of a web application?
- Decreases Cache Hit Rate
- Improves Session Management
- Increases Network Latency
- Reduces Database Load
A distributed cache reduces the load on the database by storing frequently accessed data, reducing the need to query the database, and thereby enhancing the scalability of a web application.
What is a potential downside of using round-robin load balancing in a heterogeneous server environment?
- Improved Resource Utilization
- Increased Latency
- Limited Fault Tolerance
- Uneven Distribution of Load
A potential downside of round-robin load balancing in a heterogeneous server environment is the uneven distribution of load, as servers may have different capacities or capabilities, leading to suboptimal performance.
How can containerization aid in scaling web applications?
- Enhanced Portability
- Improved Isolation
- Increased Hardware Utilization
- Reduced Microservices
Containerization aids in scaling web applications by providing enhanced portability, allowing applications to run consistently across different environments, facilitating easier scaling and deployment.
Load balancing is critical in a _________ architecture to distribute traffic evenly across servers.
- client-server
- microservices
- monolithic
- peer-to-peer
Load balancing is critical in a monolithic architecture to distribute traffic evenly across servers.