The RIB (Routing Information Base) is a database of routing prefixes that includes all learned routes, such as those from dynamic routing protocols, static routes, and directly connected routes.The FIB (Forwarding Information Base), on the other hand, is used to make IP destination prefix-based switching decisions and contains only the best path as determined by the routing protocol, which is used to forward packets12345.

References:= Cisco documentation and learning resources on RIB and FIB.

The correct configuration for a successful login to router R1 is found in Option C. This option likely includes the necessary login authentication commands and settings that align with the best practices and guidelines provided in the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course. The course emphasizes the importance of proper configuration of network devices for secure and reliable access, which includes setting up appropriate user authentication methods, specifying privilege levels, and ensuring that the login process is secure to prevent unauthorized access.

Quality of Service (QoS) packet classification can be performed using different fields in the packet headers. The Type of Service (TOS) field in the Layer 3 header is used for this purpose. It allows network devices to classify packets based on the level of service they require. This classification is crucial for managing network traffic effectively, ensuring that high-priority services receive the bandwidth and low-latency treatment they need.

References: The Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) training provides a deep dive into Service Provider technologies, including QoS, and how to configure, verify, troubleshoot, and optimize network infrastructures

To enable OSPF debugging when an OSPF neighborship goes down, the EEM script must monitor for syslog messages indicating the neighborship change and then execute the OSPF debug commands. Option B is the correct script because it includes the event syslog pattern to match the OSPF neighbor down message and the necessary actions to enable debugging.