PCNSE · Question #636
An administrator is assisting a security engineering team with a decryption rollout for inbound and forward proxy traffic. Incorrect firewall sizing is preventing the team from decrypting all of the…
The correct answer is C. Known malicious IP space D. High-risk traffic categories E. Public-facing servers. When firewall resources limit the scope of decryption, prioritizing traffic that poses the highest security risk or targets critical assets is essential.
Question
An administrator is assisting a security engineering team with a decryption rollout for inbound and forward proxy traffic. Incorrect firewall sizing is preventing the team from decrypting all of the traffic they want to decrypt. Which three items should be prioritized for decryption? (Choose three.)
Options
- AFinancial, health, and government traffic categories
- BLess-trusted internal IP subnets
- CKnown malicious IP space
- DHigh-risk traffic categories
- EPublic-facing servers
How the community answered
(57 responses)- A9% (5)
- B19% (11)
- C72% (41)
Why each option
When firewall resources limit the scope of decryption, prioritizing traffic that poses the highest security risk or targets critical assets is essential.
Financial, health, and government traffic categories often contain highly sensitive personal data and are frequently *excluded* from decryption policies due to strict privacy regulations and compliance requirements, rather than prioritized for inspection.
While traffic from less-trusted internal IP subnets might warrant inspection, the focus for *initial* decryption rollout under resource constraints for inbound and forward proxy traffic is typically on external threats and critical assets, not internal network segments.
Prioritizing decryption for known malicious IP space ensures that the firewall can thoroughly inspect potential threat communications to or from compromised entities, helping to detect and prevent advanced attacks.
Decrypting high-risk traffic categories (e.g., P2P, anonymizers, unrated URLs) allows the firewall to apply threat prevention and data filtering policies to obscure traffic that is more likely to contain malware or policy violations.
Decrypting traffic destined for public-facing servers enables the firewall to inspect inbound encrypted connections for exploits, web application attacks, and other threats targeting critical external-facing infrastructure.
Concept tested: Decryption prioritization in resource-constrained environments
Source: https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/decryption/decryption-deployment-best-practices/outline-your-decryption-policy
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