Question: a) When NAT is used, why can sniffers not learn anything about the internal IP addresses of internal hosts? b) Why does NAT stop scanning

a) When NAT is used, why can sniffers not learn anything about the internal IP addresses of internal hosts?
b) Why does NAT stop scanning probes?
c) Why is NAT traversal necessary?
d) Is a NAT traversal method easy to select?

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