Hầu hết các mạng không dây sử dụng một biến thể của cấu trúc liên kết sao (mà không cần dây dẫn, tất nhiên).Bạn triển khai cấu trúc liên kết cần phải dựa theo yêu cầu kết nối, ngân sách, và phần cứng có sẵn. Cấu trúc liên kết bus là đơn giản nhất để thực hiện và là cấu trúc liên kết mạng được sử dụng rộng rãi nhất. | measures for setting up policies that define how physical access to networking devices will be restricted. It defines and restricts access to the network based on identity does not allow network access to an individual without proof of their identity using network access control or authentication and controls how the network is connected to the Internet or to another network. The purpose of network security is to prevent and detect unauthorized use of computing and network resources. Prevention measures need to be developed so that unauthorized users can be prevented from accessing part of the computer network they are not allowed to. Detection is necessary in determining attempted and successful network breaches and identifying the systems and the data that have been compromised. Network security is necessary not only to protect the data from unauthorized access but also to protect an unauthorized user from initiating fraudulent transactions under false pretenses such as forged emails or financial transactions. To adequately secure a network we need to have a comprehensive plan. In formulating such a plan we need to consider physical security as well as network authentication and access control user rights and user access to workstations servers disk space and printers. In this section we talk about the security issues relating to LAN resources that affect both local and remote LAN users. We talk about physical security network authentication and access control common attacks on networks and ways to ensure operational security in a wired LAN environment. Physical Security Physical network security deals with securing physical computing assets and resources from the adversaries. Most common physical security issues include theft and network hacking through penetrating into the physical network cable. To protect wired networks from theft in most cases a well-controlled premises entry system with safeguards against intrusion is necessary. This normally includes a .
