这里需要(yào )说明的是,在我们系(xì )统(tǒng )里面如果单独设(shè )置一(yī )个子域(yù )名解(jiě )析,比如将主(zhǔ )机(jī )名设置为mail,单(dān )独(dú )解(jiě )析到(dào )9,那么该(gāi )解析记录(lù )优(yōu )先(xiān )泛域(yù )名在实际使(shǐ )用中作用(yòng )是非(fēi )常广泛(fàn )的,比如(rú )实现无(wú )限(xiàn )二级域名功能,提供(gòng )免费的url转(zhuǎn )发,在
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