Lecture notes for learning the basics of information and communication networks. Used about 5 times in lectures, so there are no noticeable stains. By the way, there are no writings. As shown in the image, there is a slight crease on the cover, so please refrain from purchasing if you are sensitive to this. - Title: Information and Communication Networks Lecture Notes: Understanding from the Basics - ISBN: 978-4-274-21835-4 - Price: 2500 yen (excluding tax)