单项选择题

A default Frame Relay WAN is classified as what type of physical network?（）

A.point-to-point
B.broadcast multi-access
C.nonbroadcast multi-access
D.nonbroadcast multipoint
E.broadcast point-to-multipoint

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单项选择题

Which network protocol does DNS use?（）

A.FTP
B.TFTP
C.TCP
D.UDP
E.SCP

单项选择题

DNS servers provide what service?（）

A.they run a spell check on host names to ensure accurate routing
B.they map individual hosts to their specific IP address
C.they convert domain names into IP address
D.Given an IP address,they determine the name of the host that is…

填空题

钢筋混凝土地下连续墙施工与槽壁稳定有关的因素可以归纳为（）、（）和（）三个方面。