Cisco Updated 350-601 Exam Questions and Answers by rudi

Reverse Path Forwarding (RPF) is a feature used in IP multicast routing that ensures multicast traffic is sent back to the receiver efficiently and without looping. In the context of a content delivery network (CDN) sending video traffic, when a receiver requests traffic through an IGMP join message, the multicast routing device uses RPF to populate the multicast routing table with the correct source (S) and group (G) information. RPF checks the source of the incoming packet against the multicast routing table and forwards the packet only if it arrives on the interface that leads back to the source. This mechanism prevents traffic loops and ensures that the multicast distribution device sends the required traffic back to the receiver along the most efficient path.

References: The explanation is based on the principles of IP multicast routing as detailed in Cisco’s Data Center Core Technologies documentation, specifically the sections on “Implementing Multicast in Data Center” and “IP Multicast Technology Overview” which discuss the role of RPF in multicast distribution

When configuring traffic capture to investigate issues such as buffering problems and packet drops, it’s important to consider where to place the capture points. Typically, you would configure a SPAN (Switched Port Analyzer) or RSPAN (Remote SPAN) session to mirror the traffic from the affected areas to a monitoring device. The configuration would involve:

• Identifying the source ports or VLANs where the issues are observed.
• Specifying a destination port connected to a network analyzer like Wireshark.
• Ensuring the destination port is not used for regular network traffic.

For example, a basic SPAN session configuration might look like this:

monitor session [session_number] source interface [interface_id]

monitor session [session_number] destination interface [destination_interface_id]

References: The Implementing and Operating Cisco Data Center Core Technologies (DCCOR) course provides insights into the capabilities of Cisco devices for traffic capture and monitoring. For detailed steps and best practices, refer to Cisco’s official documentation on configuring packet capture

The configuration shown in the exhibit is related to the infrastructure firmware upgrade process in a Cisco UCS environment. When an infrastructure firmware upgrade is initiated, it typically includes updates to various components such as the adapters and the BIOS. The adapters require firmware updates to ensure compatibility with new features and fixes, while the BIOS update is crucial for system stability and to support new hardware and software enhancements. The infrastructure firmware package, also known as the ‘A bundle’, contains the necessary firmware images for these components1.

References :=

• Cisco UCS Manager Firmware Management Guide, Release 4.0, which provides detailed information on firmware upgrades for Cisco UCS components.
• System Configuration - Managing Firmware, which outlines the guidelines and procedures for firmware upgrades in Cisco UCS Manager.

The DCNM performance monitoring configuration parameter that must be implemented to achieve the result of triggering events when monitored traffic exceeds the configured percent utilization threshold is the Util% parameter. This parameter allows the administrator to set a utilization threshold as a percentage, which, when exceeded, triggers an event. The requirement to configure a maximum limit of 39860437 bytes directly relates to the statistics collected as a ratio of the total link capacity, which is effectively managed by setting the Util% parameter. This parameter is part of the Performance Manager Configuration Wizard in DCNM, which provides the ability to set up two thresholds that trigger events when the monitored traffic exceeds the percent utilization configured. These thresholds can be set as either Critical or Warning events that are reported on the DCNM-SAN web client Events browser page1.

References := Cisco DCNM Fundamentals Guide, Release 11.x