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2025-03-31 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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Many training institutions and training courses take the "OSI reference Model" as the beginning of the course, which is a very important foundation for us to learn the Internet. The following is the structure diagram of osi
OSI: layer 7 Application layer (Application)
Layer 6 presentation layer (Presentation)
Layer 5 session layer (Session)
Layer 4 Transport layer (Transport)
Layer 3 Network layer (Nerwork): ip, arp, icmp and other protocols, routing equipment, data transmission between networks
Layer 2 data link layer (Data Link): Mac head, switching equipment, data frames transmitted within the network
Physical layer 1 (Physical): bitstream bit, repeater, hub (for signal relay, × × amplification to increase transmission distance)
OSI advantages: each layer is independent of each other, and the change of one layer will not affect other layers; promote standardization; make the network easy to implement and maintain; achieve interconnection, interoperability and interoperability.
TCP/IP models are divided into five categories A, B, C, D and E.
Three kinds of ABC are mainly applied.
AVR 10.0.0.0-10.255.255.255 (generally used in public network)
BRV 172.16.0.0-172.31.255.255
C 192.168.0.0-192.168.255.255 (BC is generally used in private network)
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