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Two switches have been connected with straight-through cable. The duplex mode and speed is set to auto-negotiation. The two connecting ports are configured so they can automatically negotiate and set a trunk between them. However, the communication cannot be established. What can be done to solve the problem?
Use a crossover cable.
Configure the two ports in access mode.
Manually set the speed and duplex in each end.
Disable duplex autonegotiation on both ends.
If physical layer is not properly functioning then higher layers will not work. A straight-trough cable is used to connect a network adapter (Router, PC, Firewall, etc) to a Switch or hub. If a straight-trough cable is used between two switches, communications will not work. Therefore to solve the issue the straight-through cable must be changed to a crossover cable. Autonegotiation can be used by devices that are capable of transmitting information at different rates, different duplex modes or different standards at the same speed. Autonegotiation can detect different speeds and duplex modes and use a defined one, but if cables are not properly installed, the negotiation will never happen.
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