Subject: AI/DD Comprehensive Category - For AI/DD Comprehensive Category This is "Understanding AI/DD Comprehensive Category [Technology/Theory]". It was used for studying for the certification, so there are scratches and signs of use on the cover, corners, and sides. (Please check the photos) There are no writings or major tears. You can use it without any problems for reading and studying. ■ Contents ・Terminal Equipment Technology ・Comprehensive Digital Communication Technology ・Network Technology ・Traffic Theory ・Information Security ・Connection Construction Technology With many illustrations, it is recommended for those who are self-studying or want to organize from the basics. Please purchase only if you understand that this is a used item.