"局域网与广域网：计算机通信与网络CH04"

Chapter 4 of the Computer Telecommunications and Networks course covers the topics of Local Area Networks (LANs) and Wide Area Networks (WANs). LANs are networks that are typically confined to a small geographic area, such as a single building or campus. They are often used to connect computers and other devices within a specific location, allowing for the sharing of resources such as files, printers, and servers. LANs can be classified based on their topologies, with common types including bus, ring, star, and mesh networks. Each topology has its own advantages and disadvantages in terms of scalability, reliability, and performance. LANs also use various types of transmission media, such as twisted-pair copper cables, fiber-optic cables, and wireless technologies like Wi-Fi. WANs, on the other hand, are networks that cover a larger geographic area, often spanning multiple cities or countries. WANs are typically used to connect LANs and other networks over long distances, using technologies such as leased lines, circuit-switched networks, and packet-switched networks. WANs are essential for connecting remote offices, branch locations, and mobile devices to a centralized network infrastructure. In addition to discussing LANs and WANs, Chapter 4 also covers network devices and protocols used in both types of networks. These include routers, switches, hubs, and repeaters, as well as standards such as Ethernet, TCP/IP, and the OSI model. Understanding these devices and protocols is essential for designing, implementing, and maintaining efficient and secure network infrastructures. Overall, Chapter 4 provides a comprehensive overview of LANs and WANs, including their technologies, topologies, transmission media, network devices, and protocols. By mastering these concepts, students will be well-equipped to design, troubleshoot, and optimize network systems in a wide range of environments.