To secure an on-site data center against intrusion from an insider, the best measure is to use an access badge system. Access badges control who can enter restricted areas by verifying their identity and permissions, thereby preventing unauthorized access from insiders.
Access badge: Provides controlled and monitored access to restricted areas, ensuring that only authorized personnel can enter.
Bollards: Provide physical barriers to prevent vehicle access but do not prevent unauthorized personnel entry.
Motion sensor: Detects movement but does not control or restrict access.
Video surveillance: Monitors and records activity but does not physically prevent intrusion.

Explanation:
Based on the logs, it seems that the host that originated the infection is 192.168.10.22. This host has a suspicious process named svchost.exe running on port 443, which is unusual for a Windows service. It also has a large number of outbound connections to different IP addresses on port 443, indicating that it is part of a botnet.
The firewall log shows that this host has been communicating with 10.10.9.18, which is another infected host on the engineering network. This host also has a suspicious process named svchost.exe running on port 443, and a large number of outbound connections to different IP addresses on port 443.
The other hosts on the R&D network (192.168.10.37 and 192.168.10.41) are clean, as they do not have any suspicious processes or connections.

The scenario shows MD5 hashed password values. The most likely reason the security administrator is focusing on these values is to protect against pass-the-hash attacks. In this type of attack, an attacker can use a captured hash to authenticate without needing to know the actual plaintext password. By managing and monitoring these hashes, the administrator can implement strategies to mitigate this type of threat.
References =
* CompTIA Security+ SY0-701 Course Content: Domain 04 Security Operations.
* CompTIA Security+ SY0-601 Study Guide: Chapter on Identity and Access Management.

"Network segmentation is a security practice that divides a network into smaller, isolated segments to limit access and reduce the attack surface. Firewalls are commonly used to enforce segmentation by creating rules that allow or deny traffic based on source, destination, and port. Tomeet compliance requirements, such as restricting access to internal servers, firewall rules can be configured to block all external traffic while permitting only authorized internal systems to communicate with the segmented servers. This ensures that sensitive resources are isolated from unauthorized access." Reference:CompTIA Security+ SY0-701 Study Guide, Domain 2.0: Architecture and Design, Section:
"Secure Network Architecture Concepts" (Firewalls and network segmentation are key topics).
Explanation:The requirement is to segment servers on different networks and restrict access to only authorized internal systems. Option A directly addresses this by using firewall rules to block external access while allowing internal traffic, aligning with network segmentation best practices. Option B (WAP) refers to a Wireless Access Point, which doesn't fit the context of segmentation and could expose resources to public networks. Option C (IPSec tunnel) secures communication but doesn't inherently segment networks. Option D (jump server) adds a layer of access control but doesn't address the segmentation requirement alone. Thus, A is the best fit.