CS0-003 Exam Dumps - CompTIA CyberSecurity Analyst CySA+ Certification Exam

An SLA (Service Level Agreement) is a contract or agreement between a service provider and a customer that defines the expected level of service, performance, quality, and availability of the service. An SLA also specifies the responsibilities, obligations, and penalties for both parties in case of non-compliance or breach of the agreement. An SLA can help organizations to ensure that their security services are delivered in a timely and effective manner, and that any security incidents or vulnerabilities are addressed and resolved within a specified time frame. An SLA can also help to establish clear communication, expectations, and accountability between the service provider and the customer12

An MOU (Memorandum of Understanding) is a document that expresses a mutual agreement or understanding between two or more parties on a common goal or objective. An MOU is not legally binding, but it can serve as a basis for future cooperation or collaboration. An MOU may not besuitable for requiring remediation of a known threat within a given time frame, as it does not have the same level of enforceability, specificity, or measurability as an SLA.

Best-effort patching is an informal and ad hoc approach to applying security patches or updates to systems or software. Best-effort patching does not follow any defined process, policy, or schedule, and relies on the availability and discretion of the system administrators or users. Best-effort patching may not be effective or efficient for requiring remediation of a known threat within a given time frame, as it does not guarantee that the patches are applied correctly, consistently, or promptly. Best-effort patching may also introduce new risks or vulnerabilities due to human error, compatibility issues, or lack of testing.

Organizational governance is the framework of rules, policies, procedures, and processes that guide and direct the activities and decisions of an organization. Organizational governance can help to establish the roles, responsibilities, and accountabilities of different stakeholders within the organization, as well as the goals, values, and principles that shape the organizational culture and behavior. Organizational governance can also help to ensure compliance with internal and external standards, regulations, and laws. Organizational governance may not be sufficient for requiring remediation of a known threat within a given time frame, as it does not specify the details or metrics of the service delivery or performance. Organizational governance may also vary depending on the size, structure, and nature of the organization.

Risk Acceptance means acknowledging a risk and choosing not to take further action because the cost of mitigation may outweigh the benefits.

It is the last resort when:

The risk is low impact or unlikely to occur.

Other options (mitigation, transfer, avoidance) are not feasible.

Why Not Other Options?

A (Transfer) → Moving risk to a third party (e.g., insurance).

C (Mitigation) → Implementing security controls to reduce risk.

D (Avoidance) → Eliminating the risk entirely (e.g., discontinuing a service).

Geoblocking is the best mitigation technique for unusual network scanning activity coming from a country that the company does not do business with, as it can prevent any potential attacks or data breaches from that country. Geoblocking is the practice of restricting access to websites or services based on geographic location, usually by blocking IP addresses associated with a certain country or region. Geoblocking can help reduce the overall attack surface and protect against malicious actors who may be trying to exploit vulnerabilities or steal information. The other options are not as effective as geoblocking, as they may not block all the possible sources of the scanning activity, or they may not address the root cause of the problem. Official References:

https://www.blumira.com/geoblocking/

https://www.avg.com/en/signal/geo-blocking

The security analyst is validating a Local File Inclusion (LFI) vulnerability, as indicated by the “/…/…/…/” in the GET request which is a common indicator of directory traversal attempts associated with LFI. The other options are not relevant for this purpose: SQL injection involves injecting malicious SQL statements into a database query; XSS involves injecting malicious scripts into a web page; CSRF involves tricking a user into performing an unwanted action on a web application.

The tcpdump filter (udp and port 53) isolates DNS traffic. In the output, the analyst can see DNS queries/responses, including PTR lookups and NXDomain responses. What makes this suspicious is the context (“unusual volume of traffic”) combined with the appearance of encoded/high-entropy-looking content embedded in the DNS-related data in the capture.

This pattern strongly aligns with DNS tunneling, a technique used to move data (including stolen data) inside DNS queries because DNS (port 53) is widely allowed and often less inspected. In other words, the capture indicates a covert channel over DNS consistent with data exfiltration.

The All-in-One CySA+ CS0-003 guide explicitly describes DNS tunneling as an exfiltration method:

Exact extract (All-in-One Exam Guide):

“Domain Name System (DNS) tunneling, for example, is a method of sending data via encoded DNS queries… Hunters will need to keep an eye out for abnormal DNS queries or unusually high query volumes.”

That maps directly to this scenario:

You were told there is an unusual volume of traffic.

The traffic is DNS (UDP/53).

The output shows encoded/abnormal-looking DNS content, consistent with “sending data via encoded DNS queries.”

The Sybex CySA+ Study Guide reinforces that DNS queries can be used as covert channels (including encoded/encrypted data inside DNS requests), and that abnormal DNS patterns are IoCs:

Exact extract (Sybex Study Guide):

“DNS tunneling is another potential issue that can be monitored… DNS queries that include encoded or encrypted data are potential IoCs to watch for.”

Why the other options are not supported by the pcap output

A (Meterpreter payload delivery): Meterpreter delivery is not something you’d typically conclude from DNS-only traffic unless you see very specific exploit/payload staging indicators; the capture shown is DNS query/response behavior consistent with tunneling, not a clear Meterpreter staging pattern.

C (SQL injection): SQLi evidence is normally visible in HTTP(S) requests, parameters, URIs, or server responses—nothing in the DNS-only view indicates SQLi payloads.

D (DNSSEC): DNSSEC would be indicated by DNSSEC-specific records/flags (e.g., DNSKEY/DS/RRSIG/NSEC, DO bit usage). The shown traffic is not presented as DNSSEC validation traffic; the suspicious element is encoded/high-entropy data consistent with tunneling.

E (Normal Unix-based traffic): “Normal” is contradicted by the scenario’s stated unusual traffic volume and by the presence of encoded/abnormal DNS content consistent with tunneling IoCs.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): DNS tunneling = sending data via encoded DNS queries; watch for abnormal queries / high volume

Mike Chapple & David Seidl, CompTIA CySA+ Study Guide (CS0-003): DNS tunneling and DNS queries containing encoded/encrypted data are IoCs

Thepost-incident review processhelps an organization identify gaps in its response and security posture. Assigning different departmental groups ensures that flaws inspecific work areas (such as IT, HR, or legal teams)are identified and addressed​.

Option Bis incorrect because not all staff need exposure; the review focuses on relevant stakeholders.

Option Cis a part of the process, but the main goal is improvement, not just playbook verification.

Option D(cross-training) is a benefit but not the main objective.

Thus,A is the best answerbecause it focuses on identifyingflaws in specific areas of incident management.

Documenting the process in a step-by-step format on the team wiki ensures the junior analyst has a clear, repeatable reference. This approach also supports consistency and accuracy, and the documentation can be updated or referenced by other team members as needed. CompTIA emphasizes the importance of procedural documentation in both CySA+ and Security+ for ensuring team members have reliable resources for task execution, which aids in knowledge retention and standardized practices across the team.

The best control to allow the organization to identify rogue devices more quickly is A. Implement a continuous monitoring policy. A continuous monitoring policy is a set of procedures and tools that enable an organization to detect and respond to unauthorized or anomalous activities on its network in real time or near real time. A continuous monitoring policy can help identify rogue access points as soon as they appear on the network, rather than waiting for quarterly or monthly scans. A continuous monitoring policy can also help improve the overall security posture and compliance of the organization by providing timely and accurate information about its network assets, vulnerabilities, threats, and incidents1.