1. Is the connection between switches a cross line or a straight line?

A friend who asks this question must have a network foundation, because switches and switches and other similar devices should be connected with cross network cables. The cross line is a line sequence with 568A line sequence at one end and 568B line sequence at the other end.

The current switch equipment ports support MDI/MDIX automatic rollover and duplex rate automatic negotiation, so both the through network cable and the crossover network cable can be connected to the switch. Because by default, the 568B cable sequence on both ends of the network cable we make ourselves is directly connected to the network cable, so there is no need to distinguish it at this time.

2. What is the dedicated uplink and downlink port of the switch? Where?

The switch is a transit device for network data, and the connection ports of the uplink device and downlink device it connects are called uplink ports and downlink ports. At the beginning, there was a strict definition. Now, it is not so strict to distinguish which port on the switch. Just like in the past, there were many excuses and ports on the switch. Now, for example, a 16 way switch has 16 ports when it is received. There is nothing else.

Advanced and more expensive switches will provide several dedicated uplink and downlink ports. Generally, the connection speed of the dedicated uplink and downlink ports is much higher than that of other ports. For example, an advanced 26 port switch is 24 100 megaports plus 2 1000 megaports. The port is composed of 100 megabytes for connecting computers, routers and webcams, and 1000 megabytes for connecting switches.

Different manufacturers have different implementation schemes for clusters. Typically, manufacturers use proprietary protocols to implement clustering. This determines the limitations of cluster technology. Switches from different manufacturers can be cascaded, but not clustered.

Therefore, the cascading mode of switches is simple to implement. Only one ordinary twisted pair is needed, which saves costs and is basically not limited by distance; The stacking mode has a large investment and can only be used in a short distance. Connection is more difficult. However, the stack mode has better performance than the cascade mode, and the signal is not easy to be exhausted. Moreover, the stack mode can centralize the management of multiple switches, greatly reducing the management workload.