300-745 Exam Dumps : Designing Cisco Security Infrastructure

The cyberattacks described target theapplication layer (Layer 7), specifically exploiting vulnerabilities through malformed HTTP headers. AWeb Application Firewall (WAF)is the specialized security solution required to mitigate these threats. Unlike standard firewalls that inspect traffic at the network and transport layers (IPs and Ports), a WAF performs deep inspection of HTTP/HTTPS traffic.

A WAF—such as those integrated into theCisco Secure Firewallor cloud-native WAF services—understands the structure of web requests. It can identify and block sophisticated attacks like SQL injection, Cross-Site Scripting (XSS), and the specific "invalid HTTP request headers" mentioned in the scenario. By applying a set of rules (often based on the OWASP Top 10), the WAF filters out malicious requests before they reach the web server.Antivirus software(Option A) andHost-based firewalls(Option D) protect the server's operating system from malware and unauthorized connections but cannot inspect the logic of a web request. ATraditional Firewall(Option B) would simply see the traffic as "allowed" on Port 443 and pass it through. Implementing a WAF is a critical architectural requirement in the Cisco SDSI "Applications" domain to protect customer-facing web services from exploitation.

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 DevSecOps environment, "shifting left" means identifying risks before a single line of application code is even executed.Open API Specification (OAS) Analysisis a proactive technique where the "contract" of the API (the YAML or JSON file defining its endpoints, methods, and data structures) is audited for security flaws.

By analyzing the OAS, security tools can proactively identify if "destructive" methods—like DELETE or PATCH—lack proper authorization scopes or if sensitive fields (like PII or passwords) are being exposed in responses where they shouldn't be. This allows the developer to "score" the risk based on the API's design before moving into the implementation phase.

WhileSAST (Static Application Security Testing)(Option B) is vital for finding vulnerabilities in written source code, it occursafterthe code is written.SBOM (Software Bill of Materials) Generation(Option C) tracks third-party libraries but doesn't analyze API logic.CSPM (Cloud Security Posture Management)(Option D) focuses on the misconfiguration of the cloud infrastructure (like open S3 buckets) rather than the internal logic of the API itself. OAS Analysis specifically addresses the developer's need to validate access controls and sensitive data handling during the design and definition stage of API development.