A． multicast router may receive thousands of multicast(71)every day for different groups. If a router has no knowledge about the membership status of the(72), it must broadcast all of these packets. This creates a lot of traffic and consumes(73). A better solution is to keep a list of groups in the network for which there is at least one loyal member.(74)helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the(75)packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

A．packets

B．errors

C．reports

D．alarms

[单选题] A multicast router may receive thousands of multicast （71） every day for different groups. If a router has no knowledge about the membership status of the （72） , it must broadcast all of these packets. This creates a lot of traffic and consumes （73）

[名词解释] Multicast多对象传播

[单选题]在路由器中，登录Router时，“Router#”显示说明了Router现在处在（）模式下。A . 全局配置模式B . 用户配置模式C . 特权配置模式D . 普通配置模式

[单选题]In April, thousands of holidaymakers remained abroad duc to the volcanic ash cloud.A．stickingB．stuckC．to be stuckD．to have stuck

[单选题]Thousands of people to watch yesterday ‘s match against IrelandA． turned on B. turned in C. turned around D. turned out

[单选题]Thousands of people perished in the storm.A．diedB．sufferedC．floatedD．scattered

[单选题]Thousands of people _______ to watch yesterday’s match against Ireland.A．turned onB．turned inC．turned aroundD．turned out

[单选题]Soon,more of the information we receive via the Internet could come(71)in digital wrappers.Wrappers are made up(72)software code that's targeted to do specific things with the data(73)within them,such as helping to define queries for search engines.

[单选题]Soon, more of the information we receive via the Internet could come(71)in digital wrappers.Wrappers are made up(72)software code that's targeted to do specific things with the data(73)within them, such as helping to define queries for search engine

[单选题]A． receiving host has failed to receive all of the segments that it should acknowledge.What can the host do to improve the reliability of this communication session?A．Start a new session using UDPB．Obtain a new IP address from the DHCP serverC．Use a