ccna 200 301 syllabus design

ccna 200 301 syllabus design.(1) Fixed Configuration SwitchesFixed configuration switches use a fixed configuration and ports cannot be added or removed. For example, if you purchase a 24-port 100-bit switch with 24 ports configured on the switch, it is 24 ports and cannot be expanded to 48 ports, nor can you replace a 100-gigabit port with a gigabit port .(2) Modular switchModular switches offer more flexibility. Modular switches are usually configured with different sized chassis to allow for the installation of different modular line cards. If a modular switch is purchased with 24 port modules, additional 24 port modules can be easily added' to bring the total number of ports to 48.(3) Stackable SwitchesStackable switches can be interconnected using a single backplane cable to provide high throughput between switches, allowing multiple switches in a stack to be treated as one switch. Multiple switches can be connected together by cascading or by stacking. The left portion of Figure 9-1-2 shows cascading between switches, and the right portion shows stacking between switches.Cascading is the connection of multiple identical switches through a network transmission medium. Depending on the transmission medium, the distance between two switches varies, and the speed of the cascade is affected by the transmission medium, whose bandwidth is usually 100 Mb/s or 1000 Mb/s. In addition, cascading increases the latency, as shown in Figure 9-1-2, PC1 in the cascade wants to access PC2, PC1 sends the data frame to switch SLS1 to query the local MAC address table, and forwards the data frame to switch S2, and then forwards the data frame to PC2. The more switches in the cascade, the more times the MAC address table will be queried and the longer it will take.Stacking is the process of stacking multiple switches together with specialized stacking modules and stacking cables, which is still equivalent to one switch, but with an increased number of ports. Stacking cables generally have speeds of 1000Mb/s or more. However, stacked cables are generally no longer than 1 meter, and stacking limits the range of the network. Stacking is faster than cascading and requires only one lookup of the MAC address table, which is a query of the total MAC address table.Figure 9-1-2 Cascading and Stacking Based on the requirements of hierarchical network design, access layer switches generally have the following characteristics.. Port security (port security). Port security for switches is covered later in this chapter.