For the scope of its subject, the book is quite small. Noll quickly goes over a large number of areas. From the history of various communications methods since the 19th century, to explaining about computers and the Internet. It is partly a history book.
It is not very technical. Seems to be aimed at a reader who is outside the engineering and computing field. But for such a person, Noll gives a good description of the key ideas and people who made it happen. Should be readily understandable to a wide audience.