(Communication skills: including IP address planning, VLAN, TRUNK, VTP, Layer 3 communication, STP (PVST+, MST), HSRP and ACL skills, etc. Network address translation: including NAT (static NAT, PAT), dual-line access NAT equipment, Dynamic routing technology such as virtual server equipment: including the basic concept of dynamic routing protocol, the principle of RIP routing protocol, OSPF routing protocol and equipment and other labor access quality: including the basic principle of QoS, CAR technology, GTS technology, CBWFQ technology, etc. (bdqn))
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