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NAT: network address translation -motivation: local network uses just one IP address as far as outside world is concerned. -implementation: NAT router 阅读全文
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--Use the NOT keyword to select all records where City is NOT "Berlin" SELECT * FROM Customers WHERE NOT City = ‘Berlin‘; --通配符 _ --Select all records 阅读全文
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two types of links: 1. point to point 2.broadcast(shared wire or medium) -Multiple access protocol: distributed algorithm that determines how nodes sh 阅读全文
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-Parity Checking ( odd/even parity ) single bit parity two-dimensional bit parity -Checksum -CRC cyclic redundancy check view data bits, D, as a binar 阅读全文
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ARP: address resolution protocol 地址解析协议,用于实现从 IP 地址到 MAC 地址的映射,即询问目标IP对应的MAC地址。 一般情况下,上层应用程序更多关心IP地址而不关心MAC地址,所以需要通过ARP协议来获知目的主机的MAC地址,完成数据封装。 -ARP ta 阅读全文