Choose two. An ISP asks that certain routes not be advertised to any of your eBGP peers. Which well-known BGP communities on a received prefix will cause your router to refrain from advertising that prefix to its eBGP neighbors?

The no-export community (0xFFFFFF01 or 65535:65281) prevents a BGP router from advertising a received prefix to any eBGP peer outside its own autonomous system (AS). It can be advertised to other ASes, but they must not re-advertise it further. The no-advertise community (0xFFFFFF02 or 65535:65282) is more restrictive, preventing a BGP router from advertising the received prefix to any other BGP peer, whether internal (iBGP) or external (eBGP). Therefore, both communities achieve the goal of preventing advertisement to eBGP neighbors. The internet community (0x0) is the default and allows advertisement everywhere. The local-AS community (0xFFFFFF03 or 65535:65283) restricts advertisement to other BGP speakers within the same local AS, but allows advertisement to eBGP peers if the prefix originated within that local AS.