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1. Network Cutover Overview I want to make it clear that the concept of "network" . It does not refer to small-scale networks such as small home broadband, but large and medium-sized commercial networks, such as enterprises, financial institutions, government agencies, and large-scale educational parks,etc. Small home network that maybe you can succes, you will not be able to get online but the network of business and business needs professional technical services. Suppose we have such a customer, the customer has a new park just completed. The park includes a number of buildings, and the geographical coverage is also wide. We will not be able to build the construction of the park. After the park is completed, it will definitely need a dedicated network to carry the company's business traffic which may be wireless or wired, or a wired or wireless converged network. In any case, it is definitely necessary to have a large-scale campus network to carry electronic busine

1. Network Cutover Overview I want to make it clear that the concept of "network" . It does not refer to small-scale networks such as small home broadband, but large and medium-sized commercial networks, such as enterprises, financial institutions, government agencies, and large-scale educational parks,etc. Small home network that maybe you can succes, you will not be able to get online but the network of business and business needs professional technical services. Suppose we have such a customer, the customer has a new park just completed. The park includes a number of buildings, and the geographical coverage is also wide. We will not be able to build the construction of the park. After the park is completed, it will definitely need a dedicated network to carry the company's business traffic which may be wireless or wired, or a wired or wireless converged network. In any case, it is definitely necessary to have a large-scale campus network to carry electronic busine

Telnet *.*.*.* The device to be telnet needs to set the password of line vty. If you need to enter privileged mode, you need to configure it. Enable password Show users (check "Who" is logged in locally) Show sessions (view "I" telnet outgoing session) Clear line * (forced interrupt "telnet to local" session) Disconnect * (forced interrupt "telnet out" session) =========================================================== =============== Show flash: (view the IOS file in flash) Copy running-config tftp: (copy running-config to the tftp service) Copy tftp: running-config Copy startup-config tftp: Copy tftp: startup-config Copy flash: tftp: Copy tftp: flash: Copy flash: tftp://1.1.1.1/c2500-ik8os-l.122-31.bin =========================================================== =============== Switch function: 1. Address Learning Address learing 2. Forward/Filter Decision Forward/Filter Decision 3. Loop avoidance Loop avo

The three-tier architecture of the network: 1. Access layer: Provide network access points, the corresponding device ports are relatively dense. Main equipment: switches, hubs. 2. Convergence layer: The aggregation point of the access layer can provide routing decisions. Implement security filtering, flow control, remote access. Main equipment: Router. 3. Core layer: Provide faster transfer speed, do not do any operation on the packet  ============================== ============================================= OSI seven-layer network model: Protocol data unit 1. Physical layer: Rate, voltage, pin interface type Bit 2. Data link layer: Data error detection, physical address MAC Frame 3. Network layer: routing (path selection), logical address (IP) Packet 4. Transport layer: reliable and unreliable transport services, retransmission mechanism. Segment 5. Session layer: Differentiate data from different applications. The operating system works on this layer. DATA