Network Systems Management, Second Edition is a comprehensive, modern and resourceful textbook for both undergraduate and graduate students. The book started from the meaning of computer systems to understanding what Network systems and security represents in information processing. This textbook teaches the TCP/IP Protocol Suite, TCP/IP Concept Example, Ports, Servers and Standards, types of Computer Network Systems Models- Peer to Peer and Client/Server Models. It discusses the Improved Internet Technologies and Client/Server Computer Network Model; the Classification Of Computer Networks, the hub, Router and network Switch are illustrated with diagrams. The book also highlights the General Benefits of Network Switching, how to replace a Central Hub with a Switch and design for maximum benefit. In addition, the use of Servers was examined. This textbook also examines the different Types of WLAN, WLAN standards, WPA2/802.11i, explains how the Metropolitan Area Network (MAN) as a computer network works, its advantages, the steps To Calculating the Subnet of an IP on Networks. The Subnetting of IPv6, the IPv6 loopback IP address and how to determine IP issue for different operating System users.