What type of traffic is typically a concern in terms of security?

Traffic that does not comply with RFC standards is a significant concern in terms of security because these standards ensure that network protocols operate correctly and reliably. When traffic deviates from these standards, it may indicate malicious intent, potential vulnerabilities, or poorly configured systems, all of which can lead to security risks.

Non-compliant traffic may contain exploits or vulnerabilities that attackers can use to breach a network's defenses. Furthermore, such traffic can disrupt standard operations as it may not be processed correctly by devices designed with RFC compliance in mind. Therefore, monitoring and managing this type of traffic is crucial for maintaining a secure network environment.

Looking at the other options, while traffic from well-known platforms typically adheres to security standards, it can still be compromised or misconfigured. High encryption standards, on the other hand, are generally a positive attribute, enhancing security rather than introducing risk. As for standard web browsing traffic, while it warrants monitoring, it is often well-understood and does not present the same level of potential risk as traffic that fails to comply with established standards.