Content Delivery Networks (CDN) in Computer Networks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Content Delivery Network (CDN)?

A CDN is a system of servers placed in many locations worldwide. It delivers web content to users faster by serving data from the closest server instead of the original source.

beginner

Why do CDNs improve website speed?

CDNs reduce the distance data travels by using nearby servers. This lowers delay and speeds up loading times, like getting a package from a local store instead of a far warehouse.

intermediate

What is caching in the context of CDNs?

Caching means storing copies of content on CDN servers. When users request data, the CDN gives the cached copy quickly without asking the original server every time.

intermediate

How do CDNs handle traffic spikes?

CDNs spread user requests across many servers. This sharing prevents overload on one server, helping websites stay fast and available during high traffic times.

advanced

Name two security benefits of using a CDN.

1. CDNs can block malicious traffic before it reaches the main server. 2. They help protect against attacks like DDoS by absorbing large traffic volumes.

What is the main purpose of a CDN?

A To create websites from scratch

B To store user passwords securely

C To replace the original web server completely

D To deliver content faster by using servers close to users

CDNs speed up content delivery by serving data from nearby servers, reducing delay.

Which technique do CDNs use to serve content quickly?

A Deleting old files immediately

B Encrypting all data

C Caching content on multiple servers

D Using a single central server

Caching stores copies of content on CDN servers to serve requests faster.

How do CDNs help during sudden traffic spikes?

A By distributing requests across many servers

B By shutting down some servers

C By slowing down user connections

D By deleting cached content

CDNs balance load by spreading user requests to avoid server overload.

Which of these is NOT a benefit of using a CDN?

A Improved website speed

B Automatic website design

C Better security against attacks

D Handling large traffic volumes

CDNs do not design websites; they improve delivery and security.

Where are CDN servers typically located?

A In many locations worldwide

B Only in the website owner's country

C Inside users' devices

D Only in the original data center

CDN servers are spread globally to be close to users.

Explain how a CDN improves the user experience when accessing a website.

Think about how distance and server load affect speed.

Describe the security advantages that a CDN provides to a website.

Consider how CDNs act as a shield for the main server.