D and E are correct.
Here is an excellent guide that provides SAN design overview:
https://community.cisco.com/kxiwq67737/attachments/kxiwq67737/4436-docs-data-center/627/1/99126-Large%20SAN%20Design%20Best%20Practices%20using%20MDS%209710.pdf
Explanation:
B. Port bandwidth to uplink bandwidth
This is one of the most common oversubscription types. It refers to the ratio of bandwidth available on the switch's ports (connected to servers, for example) compared to the total uplink bandwidth to the next layer of the network.
Example: If you have 10 server ports running at 10 Gbps but only a 20 Gbps uplink to the core, the oversubscription ratio is 5:1.
D. Edge ISL bandwidth to core ISL bandwidth
This refers to the oversubscription of bandwidth between the edge switches (connected to servers) and the core switches in a multi-tier network.
ISL (Inter-Switch Link) connections often aggregate traffic from many edge devices, leading to potential oversubscription at the core.
Example: If edge switches have 80 Gbps total bandwidth but only 20 Gbps ISL bandwidth to the core, the oversubscription ratio is 4:1.
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