ccna 200 301 bookstore online

ccna 200 301 bookstore online.You are the network administrator for a large corporation in San Jose. The owner says he received your request to purchase a new switch, but is unsure whether to approve the expense. Do you really need a new switch?If you can switch, of course you want a new one! The newest switches do add a lot of functionality to the network, and they have features that the older 10/100 megabit switches don't (a 5 year old switch would be an old device today). But most of us in business don't offer an unlimited budget to buy all new gigabit switches. 10/100 megabit switches can also create a great net one if designed and implemented properly one but eventually you will need to replace those switches.Do you need 1 Gbit/s or faster switch interfaces for all users, servers, and other devices? Yes, new higher-end switches are definitely needed! With the new Windows network stack and IPv6 solutions in front of us, servers and hosts are no longer the bottleneck of the interconnected network. The bottleneck is our routers and switches! We need at least Gigabit to the desktop, and router interface rates of 10GbiVs and higher at best, all depending on affordability.So, let it go! Make a request for all new switches (the latest Nexus switches from Cisco are described in Chapter 7, "Introducing Nexus").Now that you have learned about interconnected networks and the various devices that make up an interconnected network, let's look at the interconnected network model.2.2 The Network Interconnection ModelAt the beginning of the network, computers could usually only communicate with other computers from the same manufacturer.33For example, an enterprise could use either the DECnet solution exclusively or the IBM solution exclusively - not both at the same time. In the 1970s, the International Organization for Standardization (ISO) created the Open Systems Interconnection (OSI) reference model to break this restriction.The 0SI model was originally created to help vendors use a unified protocol to develop network devices and software that could collaborate with each other and allow networks from different vendors to communicate with each other. This is like world peace, which is unlikely to be fully achieved, but is still a great goal.