300-745 Exam Dumps : Designing Cisco Security Infrastructure (300-745 SDSI) v1.0

According to theCisco Security Incident Responselifecycle and theNIST SP 800-61standards referenced in the SDSI objectives, the very first step in responding to a third-party vulnerability disclosure isIdentification and Validation. Before a team can patch, notify stakeholders, or monitor for exploits, they must perform an asset inventory check to confirm whether the specific vulnerable version of the product is actually running within their environment.

In a complex CI/CD pipeline, multiple tools and versions coexist. Jumping straight to patching (Option D) without validation can lead to unnecessary downtime or "breaking" integrated workflows if the vulnerability doesn't actually apply to the version in use. Similarly, using an IDS (Option A) is a detection/monitoring step that follows the confirmation of risk. Notifying customers (Option B) is a later phase in the incident response process, usually reserved for confirmed breaches or significant service impacts. By confirming the presence and version of the software first, the security team can accurately assess theblast radiusand prioritize remediation efforts based on the actual risk to the university's specific infrastructure. This systematic approach ensures that resources are allocated efficiently and that the security posture is managed based on verified data rather than assumptions.

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In a multi-cloud architecture, traditional perimeter-based firewalls often create "chokepoints" and fail to provide the granularity needed for east-west traffic between microservices across different providers. Adistributed firewallis the architectural solution designed to meet these modern requirements. Unlike a centralized appliance, a distributed firewall is implemented as a software-defined layer that resides close to the workloads—often within the hypervisor or as part of a service mesh.

According to Cisco Security Infrastructure objectives, a distributed firewall allows forcentralized managementof a unified policy that is pushed out to all enforcement points, regardless of whether the workload is in AWS, Azure, or an on-premises data center. This ensuresconsistent security policiesacross the entire footprint. Because the enforcement is decentralized, the solution scales automatically as new cloud platforms or workloads are added. While aTraditional Firewall(Option A) lacks the multi-cloud agility, aZone-based Firewall(Option B) is typically tied to specific physical or logical interfaces on a router, and aHost-based Firewall(Option D) is managed at the individual OS level, which becomes difficult to coordinate centrally at scale. The distributed firewall model aligns with theCisco SAFEarchitectural goal of pervasive security and simplified operations in highly dynamic, heterogeneous cloud environments.

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A Security Operations Center (SOC) is often overwhelmed by thousands of alerts from various security tools. The primary tool used to aggregate, correlate, and—most importantly—prioritizethese incidents is theSecurity Information and Event Management (SIEM)system. According to the Cisco SDSI domain on Risk, Events, and Requirements, a SIEM acts as the central brain of the SOC.

A SIEM (such as Splunk or Cisco Secure Cloud Analytics) ingests logs from firewalls, endpoints, and cloud services. It uses correlation rules and risk-scoring algorithms to distinguish between low-priority "noise" and critical security incidents. For example, a single failed login might be ignored, but ten failed logins followed by a successful one and a large data transfer would be escalated as a high-priority incident.Endpoint Detection and Response (EDR)(Option B) andEndpoint Protection Platforms (EPP)(Option D) provide deep visibility and protection on individual hosts but lack the cross-platform correlation needed to prioritize organizational risk.CloudWatch(Option C) is a monitoring service for AWS resources but does not function as a multi-source security correlation engine. By using a SIEM, SOC analysts can focus their limited time on the most impactful threats, ensuring a more efficient and effective incident response process.

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