What does it mean to not be "in band" with something? Why is it necessary to do key exchanges outside of the symmetric encryption communication channel?

A+ Guide To It Technical Support
10th Edition
ISBN:9780357108291
Author:ANDREWS, Jean.
Publisher:ANDREWS, Jean.
Chapter16: Securing And Sharing Windows Resources
Section: Chapter Questions
Problem 5TC
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What does it mean to not be "in band" with something? Why is it necessary to do key exchanges outside of the symmetric encryption communication channel?

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