Explanation
Encryption of data in transit should be the engineer's greatest concern regarding the security of the solution.
Data in transit refers to data that is being transferred over a network or between devices. If data in transit is not encrypted, it can be intercepted, modified, or stolen by attackers who can exploit vulnerabilities in the network protocols or devices. The solution in the question sends logs from the critical devices to the aggregator in cleartext and from the aggregator to the analysis server via port 80, which are both insecure methods that expose the data to potential attacks. Verified References:
https://www.comptia.org/training/books/casp-cas-004-study-guide , https://us-cert.cisa.gov/ncas/tips/ST04-019