Cisco® 350-501 Exam Practice Questions (P. 5)

GPT-4o - Answer

The correct mode for configuring the BGP keychain in Cisco’s IOS XR software is the BGP neighbor configuration mode, not the global configuration mode. This mode allows the configuration of security features specifically associated with individual BGP neighbors, such as assigning keychains for authentication purposes. Therefore, while a keychain can indeed be created generally within the global configuration mode, for BGP-specific applications, including the definition and linkage of the keychain to a particular BGP neighbor, the correct configuration context is within the BGP neighbor configuration mode. This distinction underscores the importance of context specificity in network configuration practices.

GPT-4o - Answer

B) The correct choice here, regarding the E-BGP neighbors not exchanging routes, likely stems from the requirement for explicit routing policies on IOS-XR platforms. E-BGP sessions use different default security policies than I-BGP, primarily to prevent unintended routing announcements and acceptances. When no specific policies are configured for external connections, these sessions could appear inactive as no routes are exchanged. It is a subtle yet significant distinction, emphasizing the need for customized policy settings for each BGP session type, thus ensuring controlled and secure routing environments.

GPT-4o - Answer

The FEC (Forward Error Correction) in the OTN signal structure plays a crucial role in ensuring data integrity over transmission. It allows receiver devices to correct errors that may have occurred during data transmission, enhancing overall network reliability and performance. This error-correction capability is essential in maintaining high-quality service levels over optical transport networks, where the signal can deteriorate due to various factors like transmission distance and optical interference.

GPT-4o - Answer

Absolutely, setting the highest local preference on inbound routes is the key to dictate how outbound traffic should exit your AS. This config essentially allows a network admin to prioritize which routes should be preferred for exiting traffic. It’s a strategic move to ensure traffic flows through the optimal paths, enhancing both performance and reliability. By bumping up the local preference, we're kind of putting a big 'prefer me' sign on those routes!

GPT-4o - Answer

For two devices to establish OSPF adjacency, it’s critical their parameters align on specific settings. The correct parameters that must match include the subnet mask, area number, and hello timer setting. These ensure that both devices are in the same link-state area, can properly communicate on the same network segment, and maintain synchronized communication intervals, fundamental for OSPF operations. Matching these settings is key to forming a stable OSPF adjacency and effective routing exchanges.