"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.

After completing a vulnerability assessment and remediating the identified vulnerabilities, the next step is to rescan the network to verify that the vulnerabilities have been successfully fixed and no new vulnerabilities have been introduced. A vulnerability assessment is a process of identifying and evaluating the weaknesses and exposures in a network, system, or application that could be exploited by attackers. A vulnerability assessment typically involves using automated tools, such as scanners, to scan the network and generate a report of the findings. The report may include information such as the severity, impact, and remediation of the vulnerabilities. The operations team is responsible for applying the appropriate patches, updates, or configurations to address the vulnerabilities and reduce the risk to the network. A rescan is necessary to confirm that the remediation actions have been effective and that the network is secure.
Conducting an audit, initiating a penetration test, or submitting a report are not the next steps after completing a vulnerability assessment and remediating the vulnerabilities. An audit is a process of reviewing and verifying the compliance of the network with the established policies, standards, and regulations. An audit may be performed by internal or external auditors, and it may use the results of the vulnerability assessment as part of the evidence. However, an audit is not a mandatory step after a vulnerability assessment, and it does not validate the effectiveness of the remediation actions.
A penetration test is a process of simulating a real-world attack on the network to test the security defenses and identify any gaps or weaknesses. A penetration test may use the results of the vulnerability assessment as a starting point, but it goes beyond scanning and involves exploiting the vulnerabilities to gain access or cause damage. A penetration test may be performed after a vulnerability assessment, but only with the proper authorization, scope, and rules of engagement. A penetration test is not a substitute for a rescan, as it does not verify that the vulnerabilities have been fixed.
Submitting a report is a step that is done after the vulnerability assessment, but before the remediation. The report is a document that summarizes the findings and recommendations of the vulnerability assessment, and it is used to communicate the results to the stakeholders and the operations team. The report may also include a follow-up plan and a timeline for the remediation actions. However, submitting a report is not the final step after the remediation, as it does not confirm that the network is secure.
References = CompTIA Security+ SY0-701 Certification Study Guide, page 372-375; Professor Messer's CompTIA SY0-701 Security+ Training Course, video 4.1 - Vulnerability Scanning, 0:00 - 8:00.

ACertificate Revocation List (CRL)is adigitally signed list maintained by a Certificate Authority (CA)that containsrevoked or expired certificates. This prevents clients from trustingcompromised or outdated certificates.
TPM (A)is a hardware security module, unrelated to certificate revocation.
PKI (C)is the overall system managing digital certificates, but it does not store revocation lists.
CSR (D)is a request to obtain a certificate, not to revoke one.
Reference:CompTIA Security+ SY0-701 Official Study Guide, Security Architecture domain.

Host isolation ensures that a device cannot communicate with other systems on the network. Isolation is typically applied through EDR/XDR tools, quarantine mechanisms, or endpoint firewalls. Security+ SY0-701 identifies host isolation as a containment technique used when:
A device is suspected of compromise
Lateral movement must be prevented
Sensitive systems must be protected
A system must be completely cut off except for administrative access
Isolation enforces an immediate block on all inbound and outbound communications, effectively making the device inaccessible to any network-based resource.
Disablement of unused services (A) reduces attack surface but does not isolate the device.
A WAF (B) protects web applications, not device access.
A network IDS (D) only monitors traffic and does not block access.
Thus, C: Host isolation is the correct answer.

Monitoring outbound traffic is essential for detecting unauthorized data exfiltration from a system. A new vulnerability that allows malware to move data unauthorizedly would typically attempt to send this data out of the network. By monitoring outbound traffic, security tools can detect unusual data transfers, trigger alerts, and help prevent the exfiltration of sensitive information.
References =
* CompTIA Security+ SY0-701 Course Content: Domain 04 Security Operations.
* CompTIA Security+ SY0-601 Study Guide: Chapter on Threat Detection and Response.