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In in two switchboards performance parameters, frequently mentions animportant target: TRUNK, many two switchboards products in introducedwhen its performance, can mention can support the TRUNK function, thusmay for between the switchboard which interlocks provide the bettertransmission performance. That what is TRUNK? Which applicationsaspect uses the TRUNK function to be able to bring to us thesuperiority? How Cisco 642-176 also has in the concrete switchboard product disposesTRUNK.

The TRUNK main function is (generally is 2 - ties up many physicalport decides as a logical the channel, causes it to work likes achannel to be same. Many physical link will tie up after the sameplace, not only has promoted the entire network band width, moreoverthe data also may simultaneously by way of tie up many physical linktransmission which decides, has the link redundancy the function,appears when the network the breakdown either other reasons separatesor the multi- strip link, is left over the link also may work. But inVLAN data transmission, each factory use different technology, forexample: Cisco’s product is uses its VLAN the TRUNK technology, othermerchants products mostly support the 802.1q agreement to get the TAGhead, has like this produced the young giant frame, needs the sameport agreement to distinguish, the young giant frame because the sizehas surpassed the standard ether frame 1,518 bytes limits, theordinary net card is unable to distinguish, needs to have theswitchboard to escape TAG.

In the ordinary circumstances, when has not used TRUNK, everybodyknew, 100000000000000 ethernets twisted pair lines this kind oftransmission medium characteristic decided interlocks the ordinary10/,100 switchboard band width in two is only 100M, if is entireduplex pattern which uses, then transmits the maximum band width mayachieve biggest 200M, has like this formed the network branch and theserver bottleneck. Must achieve the higher data output rate, thenneeds to replace the transmission medium, uses 1000000000000000optical fibers or the promotion becomes 1000000000000000 ethernets,like this although can be able to achieve 1000000000000000 in the bandwidth, but the cost extremely is actually expensive (possible companyswitchboard also to need to trade together), originally does not suitthe low cost mid- and small-scale enterprise and the school use. Ifuses the TRUNK technology, through ties up four ports achieves in thesame place the 800M band width, like this might the better solutioncost and the performance contradiction.