Effects of mis-configured hosts file?

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http://serverfault.com – SSH and sudo were starting very slowly because /etc/hostname and /etc/hosts did not match. After adding a line for the hostname in the hosts file, the initial 2-4 second delay no longer occurs. At first I was surpised the mis-configured hosts file caused delays with SSH and sudo. I was SSH'ing to the server with a direct IP address, and sudo did not seem to require a hostname lookup. However, I read they were both doing reverse DNS lookups. (sudo also helpfully reported it was unable to resolve the host) What other network operations will be slowed down by such a mis-configured hosts file? F (HowTos)