Bài giảng Mạng máy tính căn bản: Chương 5 - Phan Vĩnh Thuần

Tham khảo Bài giảng Mạng máy tính căn bản - Chương 5: Hệ thống cáp của LAN và WAN (Cabling LAN and WAN) người học có thể xác định đặc điểm của Ethernet mạng, xác định thẳng, chéo, vàcáp rollover, mô tả chức năng, ưu điểm và nhược điểm của bộ lặp, các thành phần mạng không dây,...
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Bài giảng Mạng máy tính căn bản: Chương 5 - Phan Vĩnh ThuầnChương 5HỆ THỐNG CÁP CỦA LAN VÀ WAN CABLING LAN AND WANOverview• Even though each local-area network is unique, there are many design aspects that are common to all LANs. For example, most LANs follow the same standards and the same components. This module presents information on elements of Ethernet LANs and common LAN devices.Phan Vĩnh Thuần Computer Network 1• There are several wide-area network (WAN) connections available today. They range from dial-up to broadband access, and differ in bandwidth, cost, and required equipment. This module presents information on the various types of WAN connections.Phan Vĩnh Thuần Computer Network 2• Students completing this module should be able to: – Identify characteristics of Ethernet networks. – Identify straight-through, crossover, and rollover cables. – Describe the function, advantages, and disadvantages of repeaters, hubs, bridges, switches, and wireless network components. – Describe the function of peer-to-peer networks. Phan Vĩnh Thuần Computer Network 3 – Describe the function, advantages, and disadvantages of client-server networks. – Describe and differentiate between serial, Integrated Services Digital Network (ISDN), digital subscriber line (DSL), and cable modem WAN connections. – Identify router serial ports, cables, and connectors. – Identify and describe the placement of equipment used in various WAN configurations.Phan Vĩnh Thuần Computer Network 45.1. Cabling the LAN5.1.1. LAN physical layer• Various symbols are used to represent media types. Token Ring is represented by a circle. Fiber Distributed Data Interface (FDDI) is represented by two concentric circles and the Ethernet symbol is represented by a straight line. Serial connections are represented by a lightning bolt.Phan Vĩnh Thuần Computer Network 5Phan Vĩnh Thuần Computer Network 6• Each computer network can be built with many different media types. The function of media is to carry a flow of information through a LAN. Wireless LANs use the atmosphere, or space, as the medium. Other networking media confine network signals to a wire, cable, or fiber. Networking media are considered Layer 1, or physical layer, components of LANs.Phan Vĩnh Thuần Computer Network 7• Each media has advantages and disadvantages. Some of the advantage or disadvantage comparisons concern: – Cable length – Cost – Ease of installation – Susceptibility to interference• Coaxial cable, optical fiber, and even free space can carry network signals. However, the principal medium that will be studied is Category 5 unshielded twisted-pair cable (Cat 5 UTP) which includes the Cat 5e family of cables.Phan Vĩnh Thuần Computer Network 8• Many topologies support LANs, as well as many different physical media. The figure shows a subset of physical layer implementations that can be deployed to support Ethernet.Phan Vĩnh Thuần Computer Network 9Phan Vĩnh Thuần Computer Network 105.1.2. Ethenet trong khuôn viên trường học (Ethernet in the campus)• Ethernet is the most widely used LAN technology. Ethernet was first implemented by the Digital, Intel, and Xerox group, referred to as DIX. DIX created and implemented the first Ethernet LAN specification, which was used as the basis for the Institute of Electrical and Electronics Engineers (IEEE) 802.3 specification, releasedn in 1980. Network Phan Vĩnh Thuầ Computer 11• Later, the IEEE extended 802.3 to three new committees known as 802.3u (Fast Ethernet), 802.3z (Gigabit Ethernet over Fiber), and 802.3ab (Gigabit Ethernet over UTP).• Network requirements might dictate that an upgrade to one of the faster Ethernet topologies be used. Most Ethernet networks support speeds of 10 Mbps and 100 Mbps.Phan Vĩnh Thuần Computer Network 12• The new generation of multimedia, imaging, and database products, can easily overwhelm a network running at traditional Ethernet speeds of 10 and 100 Mbps. Network administrators may consider providing Gigabit Ethernet from the backbone to the end user. Costs for installing new cabling and adapters can make this prohibitive. Gigabit Ethernet to the desktop is not a standard installation at this time. Phan Vĩnh Thuần Computer Network 13• In general, Ethernet technologies can be used in a campus network in several different ways: – An Ethernet speed of 10 Mbps can be used at the user level to provide good performance. Clients or servers that require more bandwidth can use 100- Mbps Ethernet. – Fast Ethernet is used as the link between user and network devices. It can support the com ...