This site is about layered tcp ip networks. You will not only learn tcp utp protocol, LAN WAN architects, as well as ssh, ssl, ipsec, vlan, vpn, ip routing etc, you will also expect to hands on hub, switch, router, ethernet cable and serial WAN cable.
5-4-3 rule
5-4-3 rule is implemented in Ethernet and IEEE 802.3 to minimize transmission times of the signals in LAN. 5-4-3 rule requires that between any nodes on the network, there can only be a maximum of five segments, connected through four repeaters, and only three of the five segments may contain user connections.
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