nó bật ra rằng các công ty viễn thông cần một số bit cho một số chi phí quản lý. Họ tìm thấy rằng nếu họ sử dụng một chút bên trong các kênh DS0 thực tế đôi khi, chất lượng âm thanh không bị ảnh hưởng, do đó,Tìm câu trả lời Nếu không có Sử dụng nhị phân Bạn thực sự có thể lấy được số subnet và | 214 Chapter 8 Operating Cisco LAN Switches Figure 8-1 2950-24-EI Switch This particular model comes with 24 built-in 10 100 ports using RJ-45 connectors. Any of the ports can be used to connect to end-user devices or to other switches. This switch also includes two Gigabit Ethernet slots on the right side of the figure into which you can put the appropriate Gigabit Interface Converter GBIC . You will read more about GBICs in Chapter 11 LAN Cabling Standards and Topologies. Switch commands refer to the the physical RJ-45 Ethernet connectors on a 2950 as interfaces. Each interface has a number in the style x y where x and y are two different numbers. On a 2950 the number before the is always 0. The first interface is numbered 0 1 the second is 0 2 and so on. 2950 Switch Operating System Cisco switch operating systems can be categorized into two types Internetwork Operating System IOS switches and Catalyst Operating System Cat OS switches. When Cisco first entered the LAN switching arena it did so by acquiring Crescendo Communications which at the time sold a line of switches called Catalyst switches. At the time of acquisition Cisco already had sold a lot of routers and not surprisingly those routers had a different user interface compared to Crescendo s switches. So Cisco was faced with a dilemma Should it update all the Crescendo Catalyst switches to use a user interface like the routers Should it just continue to use the Crescendo Catalyst OS now typically called the Cat OS and that alone on all future switches The answer Some Cisco switches use the Cat OS CLI and some use the IOS CLI. Cisco IOS switches use the same CLI as the router IOS. Even though the switches have a similar look and feel to the router IOS they do not actually run the same IOS as the routers because switches and routers do not share a lot of the same functions and features. For instance Cisco calls the 2950 operating system the 2950 switch software instead of IOS. However because the look and
