The book, Implementing Microsoft Azure Infrastructure Solutions from Microsoft Press, is intended as a reference guide for studying the 70-533 exam. It explains every part of the Azure infrastructure in great detail, using the Azure portal and the command-line interfaces.
If you are newly into networking, another book, which is also written as a study guide for an exam, is the Network+ Certification Guide by Anthony Sequeira. The first five chapters are an excellent read as an introduction to networking. Much older and more difficult to read is the freely available TCP/IP Redbook from IBM (https://www.redbooks.ibm.com/redbooks/pdfs/gg243376.pdf); it covers much more than you need to know, but if you are interested in the topic, it's a must-read. Even if you are not interested in taking the Cisco ICND1 exam, Neil Anderson recorded a video at PacktPub, which...