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Higher Layer Independence Internet Layer Configuration should avoid higher layer dependencies. Circular dependencies Higher layer operation depends on Internet layer configuration (addressing, fragmentation) Without an IP address, can't set up a TCP/SCTP connection Can't use higher layer protocols depending on reliable transport Resource issues Embedded hosts may wish to minimize boot ROM code Some boot ROMs support IP/UDP, but not TCP/SCTP Embedded systems may not have headroom for complex higher layer protocols (e.g. LDAP) Food for thought Certificate processing requires a footprint of the same order (or greater) than TCP. |