Cisco® 400-007 Exam Practice Questions (P. 2)

GPT-4o - Answer

IPsec remains the superior choice for encryption in SDWAN environments, particularly when devices are situated behind NAT gateways. Although concerns regarding IPsec's compatibility with NAT exist, these can be effectively managed with NAT-T, a standard feature designed to allow IPsec to function seamlessly with NAT. Furthermore, IPsec provides robust security, essential for securing communication over the inherently less secure public internet infrastructure used in SDWAN. Ensure configurations align with NAT-T functionalities to optimize performance and security.

GPT-4o - Answer

The correct focus for Company XYZ, considering the FCAPS standard and wanting to track and optimize network performance, is performance management. This layer is specifically designed to measure, analyze, and tune the network to meet performance objectives. Monitoring statistical information to enhance responsiveness fits squarely into this category. It effectively serves the purpose of continuously assessing the network to ensure it operates at peak efficiency.

GPT-4o - Answer

Great spot on the microloops! Indeed, in the context of Policy-Based Routing, one crucial snag during network reconvergence is the emergence of microloops. These can occur if PBR mistakenly routes traffic through a failing link, which then returns the packets to the originating device — looping the traffic without reaching the destination and choking network performance. It's essential to configure PBR with precise network state awareness to avoid getting trapped in these unintentional loops during dynamic changes or failures in the network topology.

GPT-4o - Answer

The correct answer is C, where Software-defined WAN (SD-WAN) emerges as the most suitable choice for Company XYZ, primarily due to its comprehensive ability to meet a breadth of requirements efficiently. SD-WAN not only covers all the desired features such as DPI, SLA, secure tunnels, privacy, QoS, scalability, reliability, and ease of management but also stands out as a cost-effective solution. Given that Company XYZ values both a robust feature set and cost efficiency, SD-WAN aligns perfectly by integrating beneficial characteristics of both MPLS and Internet solutions, while significantly reducing complexities and costs associated with managing distinct transport technologies.

GPT-4o - Answer

Absolutely! The Control Plane Protection host subinterface is the go-to choice here because it specifically handles all control plane IP traffic that's directly targeted at the router's own interfaces. This subinterface sorts out the traffic hitting the router itself, ensuring that the actual control plane only deals with legitimate requests and avoids getting swamped by unnecessary or malicious traffic. This directly helps to boost both the performance and security of the router.

GPT-4o - Answer

Control path reliability is vital for ensuring fast failover and high-resilient connectivity in multi-controller network architectures. This component strategically enhances SDN survivability by managing control traffic effectively during controller failures, supporting recovery mechanisms, and optimizing routing paths. This directly satisfies the specified requirements for path diversity, capacity awareness, and reduced connectivity losses. All these features collectively contribute to robust network performance under varied conditions.

GPT-4o - Answer

It's key to understand that control plane policers (CoPP) are crucial in avoiding security risks like DoS attacks, by checking and potentially blocking packets before they reach the control plane and a routing decision is made. Additionally, CoPP's design allows it to be enforced directly in hardware to protect the software path, and although this capability is dependent on the hardware's classification abilities, it significantly enhances the device's overall resilience and stability by preventing unnecessary load on the CPU from potentially harmful traffic. This ensures a higher level of network availability and security.

GPT-4o - Answer

Scrum is the most suitable methodology for the described scenario as it provides flexibility and the ability to incorporate changes and feedback during the project cycle. This adaptability is crucial for a small organization aiming to evolve customer networks dynamically. Scrum also emphasizes regular reviews and updates on progress, which aligns well with the requirement for management to visualize project scope and weekly progress.