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Refer to the exhibit. Company A is connected to multiple upstream ISPs, with ISP_A serving as the primary upstream ISP. The company A subnet 172.43.232.0 should be announced to the secondary ISP_B only when the FTP server with IP address 10.10.1.1 is not accessible via the primary ISP. Which configuration must be applied on R1?
Correct Answer: A
advertise-map and non-exist-map BGP commands are used. The To control the advertisement of the 172.43.232.0/23 subnet to ISP_B, the advertise-map specifies the route to advertise (in this case, the route-map Advertise-route), and the non-exist-map defines the condition under which the route is advertised (in this case, when the FTP server with IP 10.10.1.1 is not accessible via ISP_A). Advertise-route route-map matches the subnet 172.43.232.0/23. The Non-RIB route-map matches the FTP server IP address 10.10.1.1. If the route to the FTP server is absent in the routing table (indicating The inaccessibility), the subnet will be advertised to ISP_B.