Correct Answer: A,D
- Extended Receiver Ready - This feature allows each ISL between supporting switches to be split into four separate virtual links, with each virtual link assigned its own buffer-to-buffer credits.
Virtual link 0 used to carry control traffic, virtual link 1 is used to carry high-priority traffic, virtual link 2 is used to carry slow devices, and virtual link 3 is used to carry normal traffic.
- Congestion Isolation - This feature allows devices to be categorized as slow by either configuration command or by port monitor.
- Port monitor portguard action for Congestion Isolation - Port monitor has a new portguard option to allow the categorization of a device as slow so that it can have all traffic flowing to the device routed to the slow virtual link.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/8_x/config/interfaces/cis co_mds9000_interfaces_config_guide_8x/congestion_avoidance_isolation.html