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Is IP useless because the other end might not support UDP or TCP? More practically/less absurdly: is SSL useless because side A doesn't support the same cipher

Is IP useless because the other end might not support UDP or TCP? More practically/less absurdly: is SSL useless because side A doesn't support the same ciphers as side B. Perhaps a Willow negotiation protocol would be needed to reconcile, but it's a bad idea from a security perspective because it enables downgrade attacks.

smaudet 3y ago
Comparing apples and oranges. A protocol is allowed to have presumptions, and then provide an interface. Its not allowed to have no interface at all and no presumptions (A void).