(An enterprise uses mobile 4M optical fiber line access. There are multiple units in the park. Each unit has its own independent local area network, which is divided into several VLANs through the third layer switch (Cisco3570). Each VLAN needs to be connected to Internate. There are about 300-400 PCs in the park, and there are internal servers such as Mail, FTP, and WEB that need to publish services.)
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