2. 计算机
  3. Astute　service　providers　realize　that　the　continued　support　of　legacy　X.25　and　asynchronous　network　elements　using　separate　oper

Astute　service　providers　realize　that　the　continued　support　of　legacy　X.25　and　asynchronous　network　elements　using　separate　oper

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问题 Astute　service　providers　realize　that　the　continued　support　of　legacy　X.25　and　asynchronous　network　elements　using　separate　operations　networks　is　cost(71).　For　example,　the　maintenance　of　multiple　networks　can　require　additional　staff.　Often,　this　staff　must　be　trained　on　multiple　vendor　technologies,　sometimes　requiring　parallel　groups　specializing　in　each(72)Hence,　additional　maintenance　procedures　must　be　maintained　and　administrative　records　are(73).　The　duplication　of　transport　facilities　to　carry(74)network　traffic　is　an　inefficient　use　of　resources.　And,　not　surprisingly,　more　technologies　installed　in　a　central　office　mean　the　necessity　for　more　physical　space,　and　an　increase　in　power　connections　and　power　consumption.　Migration　of　these(75)network　elements　to　IP-based　DCNs　is　a　logical　strategy.
选项 A、traditional
B、dominancy
C、redundancy
D、legacy
答案D
解析
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