A content delivery network (CDN) is a geographically distributed network of servers that can cache content close to end users, allowing for faster and more efficient delivery of web content, such as images, videos, and streaming media. A CDN can also handle an increase in customer demand of resources, provide high-quality streaming media, and create a user-friendly interface by reducing latency and bandwidth consumption. A CDN can also improve the security and availability of the website by mitigating DDoS attacks and providing redundancy. Verified Reference:
https://www.cloudflare.com/learning/cdn/what-is-a-cdn/
https://learn.microsoft.com/en-us/azure/cdn/cdn-overview
https://en.wikipedia.org/wiki/Content_delivery_network
A company is deploying multiple VPNs to support supplier connections into its extranet applications. The network security standard requires:
* All remote devices to have up-to-date antivirus
* An up-to-date and patched OS

Step by Step Explanation:
* Digital signatures provide non-repudiation, ensuring that the sender cannot deny signing a transaction.
This mechanism ties the transaction to the entity through cryptographic assurance.
* Federation involves identity management and authentication but does not address non-repudiation.
* Key escrow is used for securely storing encryption keys and is unrelated to transaction agreements.
* Salting hashes enhances password security but does not support transactional non-repudiation.
Reference: CASP+ Exam Objectives 2.3 - Apply cryptographic techniques to ensure non-repudiation.

Explanation
Assuring the integrity of messages is the most important security objective when applying cryptography to control messages that tell an ICS (industrial control system) how much electrical power to output. Integrity is the security objective that ensures the accuracy and completeness of data or information, preventing unauthorized modifications or tampering. Assuring the integrity of messages can prevent malicious or accidental changes to the control messages that could affect the operation or safety of the ICS or the electrical power output. Importing the availability of messages is not a security objective when applying cryptography, but a security objective that ensures the accessibility and usability of data or information, preventing unauthorized denial or disruption of service. Ensuring non-repudiation of messages is not a security objective when applying cryptography, but a security objective that ensures the authenticity and accountability of data or information, preventing unauthorized denial or dispute of actions or transactions. Enforcing protocol conformance for messages is not a security objective when applying cryptography, but a security objective that ensures the compliance and consistency of data or information, preventing unauthorized deviations or violations of rules or standards. Verified References: https://www.comptia.org/blog/what-is-integrity
https://partners.comptia.org/docs/default-source/resources/casp-content-guide