tailieunhanh - NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION - CHAPTER 7

WANs, Internet Access, and Remote Connectivity Identify a variety of uses for WANs Explain different WAN topologies, including their advantages and disadvantages Describe different WAN transmission and connection methods, including PSTN, ISDN, T-carriers, DSL, broadband cable, SONET, and wireless Internet access technologies Compare the characteristics of WAN technologies, including throughput, security, and reliability Describe the software and hardware requirements for remotely connecting to a network. | Network+ Guide to Networks, Fourth Edition Chapter 7 WANs, Internet Access, and Remote Connectivity Objectives Identify a variety of uses for WANs Explain different WAN topologies, including their advantages and disadvantages Describe different WAN transmission and connection methods, including PSTN, ISDN, T-carriers, DSL, broadband cable, SONET, and wireless Internet access technologies Compare the characteristics of WAN technologies, including throughput, security, and reliability Describe the software and hardware requirements for remotely connecting to a network Linux+ Guide to Linux Certification, Second Edition WAN Essentials Internet is largest WAN in existence Most WANs arise from need to connect buildings WANs and LANs similar in fundamental ways Differ at Layers 1 and 2 of OSI Model WANs typically send data over publicly available communications networks Network service providers (NSPs) Dedicated lines WAN link: connection between WAN sites (points) Linux+ Guide to | Network+ Guide to Networks, Fourth Edition Chapter 7 WANs, Internet Access, and Remote Connectivity Objectives Identify a variety of uses for WANs Explain different WAN topologies, including their advantages and disadvantages Describe different WAN transmission and connection methods, including PSTN, ISDN, T-carriers, DSL, broadband cable, SONET, and wireless Internet access technologies Compare the characteristics of WAN technologies, including throughput, security, and reliability Describe the software and hardware requirements for remotely connecting to a network Linux+ Guide to Linux Certification, Second Edition WAN Essentials Internet is largest WAN in existence Most WANs arise from need to connect buildings WANs and LANs similar in fundamental ways Differ at Layers 1 and 2 of OSI Model WANs typically send data over publicly available communications networks Network service providers (NSPs) Dedicated lines WAN link: connection between WAN sites (points) Linux+ Guide to Linux Certification, Second Edition WAN Essentials (continued) Figure 7-1: Differences in LAN and WAN connectivity Linux+ Guide to Linux Certification, Second Edition WAN Topologies WAN topologies resemble LAN topologies Details differ because of: Distance they must cover Larger number of users Heavy traffic WAN topologies connect sites via dedicated and, usually, high-speed links Requires special equipment Links not capable of carrying nonroutable protocols Linux+ Guide to Linux Certification, Second Edition WAN Topologies (continued) Bus Similar to bus LAN topology Often best option for organizations with few sites and capability to use dedicated circuits Dedicated circuits make it possible to transmit data regularly and reliably Ring Similar to ring LAN topology Usually use two parallel paths for data Cannot be taken down by loss of one site Only practical for connecting few locations Linux+ Guide to Linux Certification, Second Edition WAN Topologies (continued) Figure