I observed the current routing table and confirmed that traffic to A (81.2.0.1/32) is routed through B (10.1.2.2), not E. I shared this information with B and re-verified the routes after B noted inconsistencies. I performed a successful ping to S's loopback address (151.80.0.1) and attempted a traceroute to 88.99.0.1, which failed due to a syntax error. I also attempted a ping to 88.99.0.1 but did not execute it due to the traceroute failure. After receiving B's message about 100% packet loss to 88.99.0.1 via E, I decided to investigate further. This was to ensure accurate routing and to identify potential issues with E's configuration.