悠閒既上午

今日係結業禮，派成績表
又係有人歡喜有人愁
有人在意有人懶理

好早就放左學，返到樓下就去飲杯凍奶茶
攞左本來諗住今日還既書出黎睇( 因為學校圖書館冇開...冇得還 )
叫Computer Networks
第一次攞上手睇就覺得深得有趣
越睇越有趣，真係好佩服鬼佬十分有系統既思維
Network既Layer，Interface，Protocol，定義十分清晰
甚至連frequency range都有定義
例如VHF，UHF，Very High Frequency同Ultra High Frequency
呢本書仲列埋SHF，EHF同THF
Super High Frequency，Extremely High Frequency
同埋Tremendously High Frequency......= ="

之後睇Optical Fibre同Satellite
講電離層會反射某種range of frequency既EM-Wave
仲有Total Internal Reflection
然後就Transmission Efficiency......
跟住又一大大堆數學

呢D只係Computer Networks當中最低既layer...Physical Layer既一少部分
整個networking既課程你話係幾令人興奮!!!