链路层QoS技术主要针对ATM(Asynchronous Transfer Mode，异步传输模式)、帧中继、令牌环等链路层协议支持QoS。作为一种面向连接的技术，ATM提供对QoS最强有力的支持，而且可以基于每个连接提供特定的QoS保证。帧中继网络确保连接的CIR(Committed Information Rate，承诺信息速率)最小，即在网络拥塞时，传输速度不能小于这个值。令牌环和更新的IEEE802.1p标准具有区分服务的机制。
链路层QoS技术主要针对ATM(Asynchronous Transfer Mode，异步传输模式)、帧中继、令牌环等链路层协议支持QoS。作为一种面向连接的技术，ATM提供对QoS最强有力的支持，而且可以基于每个连接提供特定的QoS保证。帧中继网络确保连接的CIR(Committed Information Rate，承诺信息速率)最小，即在网络拥塞时，传输速度不能小于这个值。令牌环和更新的IEEE802.1p标准具有区分服务的机制。
With the help of the Search Filters option, users can now filter search results by type. They can do that by using the new tabs: Media, Links, Files and others. Searches can be done based on the particular time period like by typing in the date or even “Yesterday”. If users type in the name of a person, group, channel or bot, an extra filter will be applied to the searches.
How Does Bitcoin Work?
Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
