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网桥是一种（1）设备，在现代网络中，用（2）代替了网桥。 空白（1）处应选择（）
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Both bus and tree topologies are characterized by the use of multipoint(1)．For the bus,all stations attach,through appropriate hardware(2) known as a tap,directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3).Atransmission from any station propagates the length of the medium in both directions and can be received by all other(4).At each end ofthe bus is a(5),which absorbs any signal, removing it from the bus． 空白（5）处应选择（）
One ofthe main resposibilities of ICMP is to report(1).Although technology has produced increasingly relaible transmission media, errors still exist and must be handled. IP is an (2) protocol. This means that error checking and error control are not a concern of IP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not (3) errors, it simply report them. Error correction is left to the higher-level potocols. Error messages are always sent to the original (4) because the only information available in the datagram about the route is the source and destination IP addresses. ICMP use the source IP address to sent the error massage to the source of the (5). 空白（4）处应选择（）
在千兆以太网标准中，（）使A.1000BaseLX B.1000BaseSX C.1000BaseCX D.1000BaseTX用5类双绞线作为网络传输介质。
万兆以太网标准IEEE802.3ae支持的工作模式是（）。
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