面试题与答案

A public cloud is owned and operated by a third-party cloud service provider. A private cloud is used exclusively by one organization. A hybrid cloud combines elements of both public and private clouds.

Virtualization is the process of creating a virtual (rather than physical) version of something, such as a server, storage device, or network resources. In cloud computing, virtualization enables the efficient use of physical resources by creating virtual instances of them.

A hypervisor, also known as a Virtual Machine Monitor (VMM), is a software or hardware component that allows multiple operating systems to share a single hardware host. It manages and allocates resources to virtual machines.

Load balancing distributes incoming network traffic across multiple servers to ensure that no single server is overwhelmed with too much traffic. It improves the performance, availability, and reliability of applications.

Horizontal scaling involves adding more machines or nodes to a system to handle increased load. Vertical scaling involves increasing the resources (CPU, RAM) of an existing machine to handle increased load.

Serverless computing is a cloud computing execution model where the cloud provider manages the infrastructure, automatically allocating resources as needed to execute and scale applications. Developers only focus on writing code without worrying about server management.

Scalability refers to the ability of a system to handle a growing amount of workload. Elasticity, on the other hand, is the ability to automatically adapt to changing workloads by provisioning and de-provisioning resources dynamically.

A CDN is a network of distributed servers that work together to deliver web content, such as images and videos, to users based on their geographical location. It improves performance by reducing latency and increasing content availability.

Container orchestration tools manage the deployment, scaling, and operation of application containers. Kubernetes is a popular container orchestration tool.

Multi-tenancy is a cloud architecture where a single instance of a software application serves multiple customers (tenants). Each tenant's data is isolated and remains invisible to other tenants.

Serverless architecture offers benefits such as reduced operational complexity, cost savings by paying only for actual usage, and automatic scalability. Developers can focus on code without managing servers.

Stateful applications retain information about the state of a user's interactions, while stateless applications do not store such information between sessions. Stateless applications are often more scalable.

A cloud SLA is a contract between a cloud service provider and a customer that outlines the level of service and performance the customer can expect. It is important as it sets expectations and provides a basis for accountability.

BYOD (Bring Your Own Device) is a policy that allows employees to use their personal devices to access company networks and data. In the context of cloud computing, it poses security challenges that need to be addressed.

Cloud Bursting is the process of moving workloads from a private cloud to a public cloud during periods of high demand. It allows organizations to scale up temporarily when local resources are insufficient.

Key considerations include regular backups, data encryption, geographic redundancy, and a well-defined recovery strategy. Ensuring data integrity and availability is crucial for business continuity.

Horizontal scaling involves adding more database nodes to a system, while vertical scaling involves increasing the resources (CPU, RAM) of an existing database server. Horizontal scaling is often more scalable.

Fault tolerance is the ability of a system to continue operating without interruption in the presence of hardware or software failures. Cloud environments use redundancy and failover mechanisms to achieve fault tolerance.

Immutable infrastructure is an approach where once an infrastructure component is deployed, it is never modified. Instead, new instances are created with updates, reducing configuration drift and improving consistency.

Blue-Green Deployment is a strategy where two identical production environments, labeled 'blue' and 'green,' are maintained. Only one environment is active at a time, allowing for seamless updates and rollbacks.

A reverse proxy is a server that sits between client devices and a web server, forwarding client requests to the server and returning the server's responses to the clients. It can improve security, performance, and scalability.

A serverless database is a database service that automatically scales, provisions, and manages infrastructure based on the actual usage. Users are charged based on their consumption, and they don't need to manage database servers.

Infrastructure as Code is a practice of managing and provisioning computing infrastructure through machine-readable script files rather than physical hardware configuration or interactive configuration tools.

Data sovereignty refers to the concept that data is subject to the laws of the country in which it is located. It is an important consideration for organizations dealing with sensitive or regulated data.

Edge computing is a paradigm where data processing is performed near the source of data generation rather than relying on a centralized cloud server. It reduces latency and bandwidth usage for time-sensitive applications.

Key considerations include data security, compatibility, bandwidth, downtime, and ensuring data consistency during migration. A well-planned migration strategy is crucial for a successful transition.

Compliance as Code is an approach that uses code and automation to ensure that IT infrastructure adheres to regulatory and security compliance standards. It helps in maintaining a consistent and auditable compliance posture.