Why are there few alternatives to TCP and UDP, and none that are widely adopted? Besides changing TCP configuration parameters on a host, what are some ways to obscure a system profile? Can a router...

Why are there few alternatives to TCP and UDP, and none that are widely

adopted?

Besides changing TCP configuration parameters on a host, what are some

ways to obscure a system profile? Can a router that supports NAT (Chapter 12) hide the system profile?