ccna 200 301 syllabus definition wikipedia

ccna 200 301 syllabus definition wikipedia.According to the OSI functional layer in which the switch is located, it can be divided into: Layer 2 switches and Layer 3 switches. (1) Layer 2 switches forward or filter data frames according to the MAC address of the OSI data link layer (Layer 2), and are at the second layer of the OSI seven-layer model, so they are also called Layer 2 switches. Layer 2 switches are completely transparent to network protocols and user applications. (2) Layer 3 switches Layer 3 switches can use not only the MAC address information of layer 2 for forwarding and filtering, but also the IP address information of layer 3. Layer 3 switches not only learn MAC addresses and corresponding ports, but also have the ability to perform Layer 3 routing functions. A Layer 3 switch is at Layer 3 of the OSI seven-layer model, hence the name Layer 3 switch. In the next chapter of this book, the difference between a Layer 3 switch and a router is described.>9.3 Basic Switch Configuration**This section introduces the basic configuration of the switch, many configurations of the switch are exactly the same as those of the router, for the same configuration parts, this section will not repeat, this section focuses on the configuration of the IP address and default gateway of the switch.9.3.1 Similarities to Routers*Cisco supports two main types of switch operating systems: the Interconnect Operating System (IOS) and the Catalyst Operating System (CatOS) o Currently, the vast majority of the CiscoCatalyst switch family runs only Cisco IOS, but for some reason (Cisco started out as a vendor specializing in routers and later merged with the Catalyst switch vendor, into281 A1CCNA Study and Lab Guide VIIIFor the CCNA exam, however, the reader can ignore CatOS and focus on CiscoIOS±o However, it is important to remember that the reader may see terms like "IOS-based switch" and However, it is important to remember that readers may see terms and phrases like "IOS-based switch" that refer to the switch running Cisco IOS, not CatOSoThe switch is similar in hardware composition to the router, but there is no AUX (AuxiliaryPort) on the switch. o The console connections on the switch are the same as the console connections on the router, as described in Section 4.3.1 of this book.Many of the commands and operations of Cisco 1OS-based switches are identical to those of Cisco routers. The switch also supports Setup mode, and the reader is referred to Section 4.3.2 of this book. The switch also operates in User Mode, Privileged Mode, Global Configuration Mode, and Other Configuration Mode, and the reader can refer to Section 4.3.3 of this book. The configuration and use of CLI online help, command shorthand, shortcuts and advanced editing features, and history command caching features in the switch are the same as those in the router, and the reader can refer to Section 434 of this book. The naming of the switch, creation of flags, period and time settings, password configuration, hostname list configuration, remote login configuration, and DNS configuration are also configured in the same way as the router, and the reader is referred to Section 4.3.5 of this book.