Get CompTIA CAS-005 Exam Practice Questions - Real and Updated

Answer : A

The most likely explanation for the issues encountered with the captive portal is that the TLS ciphers supported by the captive portal are deprecated. Here's why:

TLS Cipher Suites: Modern browsers are continuously updated to support the latest security standards and often drop support for deprecated and insecure cipher suites. If the captive portal uses outdated TLS ciphers, newer browsers may refuse to connect, causing security errors.

HSTS and Browser Security: Browsers with HTTP Strict Transport Security (HSTS) enabled will not allow connections to sites with weak security configurations. Deprecated TLS ciphers would cause these browsers to block the connection.

CompTIA Security+ SY0-601 Study Guide by Mike Chapple and David Seidl

NIST Special Publication 800-52: Guidelines for the Selection, Configuration, and Use of Transport Layer Security (TLS) Implementations

OWASP Transport LayerProtection Cheat Sheet

By updating the TLS ciphers to modern, supported ones, the security engineer can ensure compatibility with newer browser versions and resolve the connectivity issues reported by users.

Answer : A, E

Answer : B

The best answer is B. The attacker registered a new domain. The key evidence is in the visible sender fields: From: jdoe@exampl.com and Reply-To: jdoe@exampl.com. The legitimate company domain appears to be example.com, but the fraudulent email uses exampl.com, which is a lookalike domain missing the letter ''e''. That is a classic typosquatting/business email compromise pattern. The headers also show Received-SPF: pass, which means the message passed SPF for the domain it actually came from, not that it was legitimate for the intended organization. The presence of a DKIM-Signature also shows that lack of domain keys is not the issue. This is therefore best explained by an attacker creating or registering a deceptive domain and sending authenticated email from it. CompTIA SecurityX's Security Operations domain includes activities around analyzing indicators, email artifacts, and attack patterns to identify malicious activity.

Why the other options are incorrect:

A is not the best explanation because the scenario says John Doe's account had been compromised earlier, but the specific headers here point to a spoof-like lookalike domain attack, not necessarily direct reuse of John's real mailbox. C is incorrect because the headers explicitly show a DKIM-Signature, so domain keys were used. D is incorrect because the headers show Received-SPF: pass, not fail. The payment succeeded because the attacker used a deceptive domain that looked close enough to the legitimate one to fool the recipient during the invoice exchange.

CompTIA SecurityX official exam objectives summary, especially Security Operations skills around analyzing malicious activity and indicators.

CompTIA SecurityX CAS-005 exam objectives PDF mirror.

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Answer : D

SecurityX CAS-005 cloud architecture guidance emphasizes horizontal scaling for workloads that need to handle both predictable and fluctuating growth over time. Horizontal scaling allows the infrastructure to add nodes for both compute and storage dynamically, providing elasticity to meet fluctuating computational demands while accommodating exponential storage growth.

Vertical scaling (B) has hardware limits and is not as flexible for large, sustained growth.

CDN (A) is optimized for content distribution, not intensive compute workloads.

Load balancing (C) distributes workloads but does not address scaling for data growth.

Answer : D

The best step is to query user behavior analytics (UBA) data. SIEM alerts provide potential security events, but without additional context, they may lead to false positives. UBA solutions detect anomalies by comparing user activity against baselines of normal behavior, highlighting unusual login patterns, lateral movement, or privilege escalation.

Option A (password manager logs) focuses only on credential use and lacks behavioral insight. Option B (dark web monitoring) helps identify compromised accounts but does not investigate the internal incident. Option C (audit logs for privileged actions) is useful but narrow in scope---it only covers administrator accounts.

By correlating SIEM data with UBA, the engineer can validate whether the flagged activity indicates real malicious behavior or benign anomalies. CAS-005 emphasizes advanced analytics integration (UEBA/UBA) to strengthen investigation and reduce false positives, making Option D the most effective choice.