Security & Performance Optimization Flashcards

What is a key goal of CDN security?

Answer: Protect from cyber threats

A key goal of CDN security is to protect web content and infrastructure from various cyber threats, ensuring the integrity and availability of services. This includes defending against attacks like DDoS, preventing unauthorized access, and securing data in transit with SSL/TLS encryption. Robust security measures are crucial for maintaining user trust and ensuring uninterrupted content delivery.

What is a Distributed Denial of Service (DDoS) attack?

Answer: Flooding server with traffic

A Distributed Denial of Service (DDoS) attack aims to overwhelm a target server or network with a massive flood of internet traffic. This traffic originates from multiple compromised computer systems, making it difficult to block. The goal is to make the targeted service or website unavailable to legitimate users by consuming all its resources.

How does SSL/TLS enhance CDN security?

Answer: Encrypt data transmission

SSL/TLS (Secure Sockets Layer/Transport Layer Security) protocols create an encrypted connection between a user's browser and the CDN server, as well as between the CDN server and the origin server. This encryption protects data in transit from eavesdropping and tampering. By ensuring data confidentiality and integrity, SSL/TLS significantly enhances the security of content delivered via a CDN.

What is the role of web application firewalls (WAF) in CDN?

Answer: Filter malicious traffic

A Web Application Firewall (WAF) acts as a protective shield for web applications by monitoring and filtering HTTP traffic. In a CDN, a WAF inspects incoming requests and blocks malicious traffic, such as SQL injection, cross-site scripting (XSS), and other application-layer attacks. This prevents harmful requests from reaching the origin server, enhancing security and maintaining application availability.

How does caching improve performance?

Answer: Reduce load and speed delivery

Caching improves performance by storing copies of frequently accessed content on CDN edge servers, which are geographically closer to users. When a user requests content, it can be served directly from the cache, eliminating the need to fetch it from the origin server. This reduces the load on the origin server and significantly decreases content delivery times, resulting in faster page loads and a better user experience.

What is load balancing?

Answer: Distributing traffic evenly

Load balancing is the process of distributing incoming network traffic across multiple servers or resources. Its primary purpose is to ensure that no single server becomes overwhelmed, thereby optimizing resource utilization and maximizing throughput. By distributing traffic evenly, load balancing enhances the availability, reliability, and responsiveness of applications and websites.

Why is monitoring important for CDN performance?

Answer: Detect and optimize delivery

Monitoring in a CDN involves continuously tracking various performance metrics like latency, error rates, and bandwidth usage. This allows administrators to identify bottlenecks, detect potential issues such as server overloads or network congestion, and proactively make adjustments. By understanding the CDN's performance, operators can optimize content delivery and ensure a consistent user experience.

What is the benefit of geographic load balancing?

Answer: Reduce latency by location

Geographic load balancing directs user requests to the CDN edge server or data center that is geographically closest to them. By minimizing the physical distance data needs to travel, it significantly reduces network latency. This results in faster content delivery and an improved user experience, especially for a globally distributed audience accessing content from various locations.

What is the role of analytics in CDN optimization?

Answer: Provide insights for improvements

Analytics in CDN optimization involves collecting and processing vast amounts of data related to content delivery, user behavior, and network performance. This data provides valuable insights into how content is being accessed, where bottlenecks exist, and which optimizations would be most effective. By analyzing these insights, CDN operators can make informed decisions to improve caching strategies, routing, and overall service efficiency.