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100 CÂU HỎI KỸ THUẬT VỀ MẠNG CISCO THUỜNG GẶP

At one point in time, the first letter in cisco Systems was a lowercase ``c . At present, various factions within the company have adopted a capital ``C , while fierce traditionalists (as well as some others) continue to use the lowercase variant, as does the cisco Systems logo. This FAQ has chosen to use the lowercase variant throughout. , the first letter in cisco Systems was a lowercase ``c . At present, various factions within the company have adopted a capital ``C , while fierce traditionalists (as well as some others) continue to use the lowercase variant, as does the cisco Systems logo. This FAQ has. | A couple of points are worth making. First, you cannot accumulate tokens over time. There is a maximum amount which is the value of the committed burst (Bc) and this value has a mathematical relationship with the CIR (CIR = Bc/Tc also EIR = Be/Tc). In almost all cases Tc is set to 1 second, so the result is that CIR = Bc and EIR = Be. So if you have the maximum number of tokens in your Bc token pool (max amount = Bc), and you send no frames for the next hour, you will still only have Bc amount of tokens when you send the next frame. Second, the above description is not 100% accurate so dont use it to teach a class of newbie students. I simplified a number of things for the sake of getting the concepts across, and in the process I sacrificed the accuracy of some of the information. For instance, you dont get a lump of tokens all at once as I described--in reality, your tokens replenish gradually over the Tc interval. Third, you only need a single token (which represents a byte of data) to transmit a frame. So if you are out of Bc tokens and you only have one Be token left, even if you send a 1500 byte frame, it will still be transmitted as DE and the last token will be subtracted.