IP routing process

in CCNA & CCENT
Hi everyone,
I am currently trying to get my ccna and I am at a part in the book that I just don't understand how it works I will explain:
I am reading the Todd Lammle ccna book and I have come across the IP routing process and how a packet moves from inside the LAN to outside the LAN and my question is: When a packet is destined for a remote network or a network outside its LAN it sends it to the default gateway which is the router and not through the switch first?
But then I come across another section in the book where it says "Server sends a unicast frame to Router C Because it is a unicast frame Switch A forwards the frame as well"
Please let don't hesitate to ask for further detail on the question.
I am currently trying to get my ccna and I am at a part in the book that I just don't understand how it works I will explain:
I am reading the Todd Lammle ccna book and I have come across the IP routing process and how a packet moves from inside the LAN to outside the LAN and my question is: When a packet is destined for a remote network or a network outside its LAN it sends it to the default gateway which is the router and not through the switch first?
But then I come across another section in the book where it says "Server sends a unicast frame to Router C Because it is a unicast frame Switch A forwards the frame as well"
Please let don't hesitate to ask for further detail on the question.
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