Volumes 1 & 2 of the CompTIA Network+ N10-006 official study guides.
These are an invaluable guide to all aspects of computer networking, and a useful reference even if you aren't taking the qualification.
A very few annotations and highlighting have been made, but otherwise in excellent condition.
This is a 2016 version.
CompTIA Network+ study guides (Malvern Link Top WR14)
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