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ΪʲôҪѡCND2ķ޼

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CDNǽԴվݷַȫеĽڵ㣬Ӷû鿴ӳ٣ûվӦٶվĿԵļܹЧСûֲ⡣
ΪôҸȫ˽CDNԭȡͰȫȹؼ㣬Ƹ߼רҰ׽Լ CDN 8 һЩջ͸֪׫дɡCDN֮Ҽϵ£ҡCDN ֮Ҽֳɶ֣ΪԭƪƪɿƪΪƪȽһ֡ƪʺЩδӴ˽һЩ CDN רҵ˽͸ CDN ʲôͬѧǽģCDN ڶʮǰŹǸѹԼ࣬ʹùǸѹԽԽ󣬳ЧԽԽ 1995 ꣬MIT Ӧѧ Tom Leighton о Danny Lewin λоԱһѧӵ⡣
ʹѧ㷨ݵĶ̬·ɰţս Internet ʹߵ⡣ʷ¡ѧԺ MBA ѧ Jonathan Seelig Leighton ĶУԺǿʼʵʩԼҵƻ 1998 8 20 ʽ˾Ϊ Akamai
ͬ 1998 ꣬йһ CDN ˾ ChinaCache
ڽ20УCDNҵͳչҵҲӿֳܶCDN̡CDN2008ԱCDNң2014ʽչΪCDNģΪͰͼӹ˾ṩͬʱҲԴƼķʽ
ʲô CDN أ
CDN ʵ Content Delivery Network дݷַ硱ͼһ CDN ֮ͼмҪȷһ:
Origin ServerԴվҲ CDN ֮ǰĿͻķ
UserߣҲվ
Edge ServerCDN ķָԵ֮ϸ˵
CDN У 3 һӢĸ First MileMiddle Mile Last Mile
First Mile CDN ͻķԽԽõ CDN 豸һӢ
Last Mileߣ񣩵 CDN һӢ
Middle Mileݴӽ CDN 磬 CDN ֮ǰлڣмһӢͼԿͼδ CDN ֮ǰijҵûʵŦԼҪֱ߾6,000km ңչ300,000km/s ĴٶȣһŦԼҲҪ 20ms ʱ䣬һҪ 40msǹ˴ݣϴġ豸ʱȣϰٺͳȥˣʹһСͼƬҲȸϰٺ룬ٳɶ࣬һվû޷ܡ
Ҳͼ CDN ֮ʾͼͼϿԿʵʷʵķλʵλӢ CDN CDN л湦ܣЩҳһɲݣͼƬ֡Ƶȣַ浽˸ CDN ڵϣͲشʵŦԼǷʾԼϽӢڵ㼴ɣӶʡ 80% ϵʱ䡣
ȻһӢ CDN ڵӣ CDN ڵҲλأЧԣϸںиϸ˵ҪȲԺԭ˽ DNS Э鼰乤ԭ
ƽʱĵãΪԶһ DNS ַdz֮Ϊ DNSҲ Local DNS LDNSڽһʱʵʷʵIJǡ IP ַ LDNS ;Ǹ Internet ʶ IP ַ
ijʱLDNS һһ LDNS м¼һûм¼Ĵ̲һ
赱 163 ʱ LDNS л¼ֱӽ IP ַ³
ûл¼һķȻݽлܺ󽻸յĿͻСݹ顰
ȫLDNS Ȼȫ13ѯ .com ȻشȻȥ .com ķѯ .163.com һ£õ www.163.com Ӧ IP ַ̽ϸӣҸȤȥϣͲһһ׸







һƪ쳯;ְҵ50Ԫ ֻԱ
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