如果目的IP地址显示不是同一网段的,那么A要实现和B的通讯,在流缓存条目中没有对应MAC地址条目,就将第一个正常数据包发送向一个缺省网关,这个缺省网关一般在操作系统中已经设好,这个缺省网关的IP对应第三层路由模块,所以对于不是同一子网的数据,最先在MAC表中放的是缺省网关的MAC地址(由源主机A完成);然后就由三层模块接收到此数据包,查询路由表以确定到达B的路由,将构造一个新的帧头,其中以缺省网关的MAC地址为源MAC地址,以主机B的MAC地址为目的MAC地址。通过一定的识别触发机制,确立主机A与B的MAC地址及转发端口的对应关系,并记录进流缓存条目表,以后的A到B的数据(三层交换机要确认是由A到B而不是到C的数据,还要读取帧中的IP地址。),就直接交由二层交换模块完成。这就通常所说的一次路由多次转发。 [3] 

在美国比特币的法律


EDA adjustments caused instabilities in mining difficulty of the Bitcoin Cash system, resulting in Bitcoin Cash being thousands of blocks ahead of Bitcoin. To address the problem with stability, a change of the Bitcoin Cash DAA was implemented and the EDA cancelled. The change took effect on 13 November 2017. After the change, the Bitcoin Cash DAA adjusts the mining difficulty after each block. To calculate the difficulty for a new block, the Bitcoin Cash DAA uses a moving window of last 144 blocks.[36] 

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As a merchant one of your main goals is to be able to accept and process payments as quickly and seamlessly as possible so you can make your customers happy and receive payments without any headaches. Bitcoin Cash is the solution, as it has fast and low-cost transactions. As the world goes digital, electronic currencies such as Bitcoin are becoming the go-to method for paying online and in retail shops. Easily accept Bitcoin Cash directly or use third-party providers to accept Bitcoin Cash using their platforms and convert all or part of the sale into local fiat currency.
Rising fees on the Bitcoin network contributed to a push by some in the community to create a hard fork to increase the blocksize.[11] This push came to a head in July 2017 when some members of the bitcoin community including Roger Ver felt that adopting BIP 91 without increasing the block-size limit favored people who wanted to treat bitcoin as a digital investment rather than as a transactional currency.[12][13] This push by some to increase the block size met a resistance. Since its inception up to July 2017, Bitcoin users had maintained a common set of rules for the cryptocurrency.[12] Eventually, a group of bitcoin activists,[14] investors, entrepreneurs, developers[12] and largely China-based miners were unhappy with Bitcoin's proposed SegWit improvement plans meant to increase capacity and pushed forward alternative plans for a split which created Bitcoin Cash.[15] The proposed split included a plan to increase the number of transactions its ledger can process by increasing the block size limit to eight megabytes.[12][13]

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BCH is a cryptocurrency established as a result of the hard fork that took place to manage the scalability problem. Bitcoin Cash has a number of significant differences to Bitcoin: it is advertised as being faster and cheaper to use, the maximum block size is eight megabytes against one in previous Blockchain, and it has an emergency difficulty adjustment feature. Bitcoin Cash also uses 0-conf (or zero-conf) which allows for nearly instant transactions, meaning Bitcoin Cash transactions are almost always confirmed in the next block.

Cryptocurrency是如何计算

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