this post was submitted on 23 Sep 2023
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"TCP/IP" is conventionally used to indicate the whole protocol suite; including UDP, ICMP and sometimes even ARP.
Technically the parent protocol is IP.
In all my years I have never heard someone suggest that TCP is a catch all term.
I've seen many references to TCP/IP as meaning IP + everything-on-top, usually when talking about other networking technologies like UUnet, OSI, etc. Also as the TCP/IP stack, usually meaning the (Free)BSD networking code used in other systems.
It's not that TCP is a catch-all term, but "TCP/IP" is often used that way.
https://en.wikipedia.org/wiki/Internet_protocol_suite
For that matter, the classic networking text by Douglas Comer is Internetworking with TCP/IP and it does cover UDP, ICMP, ARP, DHCP, DNS, etc.