ports for tftp and echo

From: Gary Braver (gary_braver@yahoo.com)
Date: Tue May 31 2005 - 15:53:47 GMT-3

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Looking at the iana port assignment list I see both
tcp and udp port assignments for protocols like echo
and tftp.

Why the TCP entries. Thought these protocols just
used udp. Do we need to block both TCP and UDP to
filter these?

thanks

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