RSVP RESV - need some help

Hi im a little bit confused about the RSVP RESV.
Im reading about it in the “offical cert guide” (encor 350-401 from cisco press).

On page

Dont feel that I get enough explained in the book. dont fully understand why the “previous hop” and "from "adresses are used in that case…

can someone please care to explain a little better then in the book

A post was merged into an existing topic: Introduction to RSVP