300-445 Exam Dumps - Cisco CCNP Enterprise Questions and Answers

In the context of Designing and Implementing Enterprise Network Assurance (300-445 ENNA) , understanding the visibility gap in SD-WAN environments is essential. While SD-WAN controllers provide native visibility into the overlay network (the logical IPsec tunnels and fabric health), they often lack granular insight into the physical transport or underlay network provided by ISPs or MPLS circuits.

According to the ENNA architecture guidelines, the most suitable method for measuring true SD-WAN performance is to install an agent on the underlay network (Option D). By deploying ThousandEyes Enterprise Agents directly on the transport-facing interfaces (Transport VPN0 in Cisco SD-WAN terminology), engineers can perform hop-by-hop path visualization and measure metrics like packet loss, latency, and jitter across the actual provider path. This is critical because performance degradation in the overlay is almost always a symptom of an issue in the underlay, such as BGP routing instabilities or physical link congestion at an ISP peering point.

Deploying agents on the overlay (Option A) only measures the performance of the tunnel itself, which may hide specific hop-level failures occurring in the public internet. Installing an agent on the LAN (Option C) or DMZ (Option B) adds local network noise to the metrics, making it harder to isolate if a problem exists within the corporate office or the service provider network. By focusing on the underlay , the engineer ensures they have the " internet intelligence " required to hold service providers accountable to SLAs and quickly resolve connectivity issues that impact the SD-WAN fabric.

In the Designing and Implementing Enterprise Network Assurance (300-445 ENNA) curriculum, identifying routing anomalies such as BGP Hijacking is a critical aspect of external network assurance. A BGP Hijack occurs when an Autonomous System (AS) illegitimately announces a prefix it does not own, causing traffic intended for the rightful owner to be misdirected.

By contrasting Exhibit 3.4-1 (Before the Outage) and Exhibit 3.4-2 (During the Outage), a definitive change in the routing path is observed. In the baseline view (Exhibit 3.4-1), traffic from the Los Angeles agent reaches the destination network 54.239.104.0/23, which is correctly associated with Amazon.com, Inc. (AS 16509) . However, during the outage (Exhibit 3.4-2), the path visualization shows the traffic being redirected into a different network: eNET Inc. (AS 10297) . At this new location, the traffic encounters 100% Forwarding Loss at the node ten7-8.core-2.xlhost.com.

The change in the Autonomous System (AS) number from 16509 to 10297 (Option B) is the most concrete indicator of a BGP Hijack. While symptoms such as Availability Drop (Option A), Response Delay (Option C), and Packet Loss (Option D) are clearly visible in the ThousandEyes telemetry, these symptoms are generic and could be caused by various other issues like physical link failures or congestion. The shift in the AS path—specifically to an AS that does not legitimately host the target ' s IP prefix—provides the forensic evidence needed to identify the root cause as a routing takeover. This visualization allows network administrators to bypass internal troubleshooting and immediately focus on external remediation with upstream providers.

According to the Designing and Implementing Enterprise Network Assurance (300-445 ENNA) best practices for collaboration monitoring, Microsoft Teams (as well as Webex and Zoom) is monitored using a combination of Scheduled and Dynamic tests (Option D).

Scheduled Tests: These are used to proactively monitor the reachability and performance of the Microsoft Teams infrastructure. The Teams template typically includes scheduled HTTP Server tests to teams.microsoft.com and login.microsoftonline.com, along with network-layer tests to the Teams Transport Relay (e.g., worldaz.tr.teams.microsoft.com). These provide a continuous baseline of connectivity regardless of whether a user is currently in a call.

Dynamic Tests: These are a unique feature for collaboration monitoring. When an Endpoint Agent detects that the Teams application has initiated a real-time media session (audio or video call), it automatically triggers a Dynamic Test to the specific IP and port being used for that call. This allows IT teams to see the exact network path—including hop-by-hop latency and loss—of the actual call traffic while the session is active.

Real User Tests (Option C) are generally not used for Teams monitoring in the same way they are for web-based SaaS apps. Because most users utilize the Teams desktop client rather than the browser, the RUM browser extension cannot capture the rich telemetry of the desktop application ' s internal signaling and media streams. Therefore, the specialized " Automated Session Testing " provided by Dynamic Tests , combined with the proactive health checks of Scheduled Tests , constitutes the complete assurance strategy for Microsoft Teams.