List at least THREE types of meeting.

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

s. 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.

（71）

A. packets

B. errors

C. reports

D. alarms

（72）

A. routers

B. network

C. packets

D. hosts

（73）

A. capability

B. power

C. bandwidth

D. address

（74）

A. ICMP

B. IGMP

C. OSPF

D. RIP

（75）

A. anycast

B. multicast

C. unicast

D. broadcast

A. one

B. two

C. three

D. four

How often does the General Election in Britain take place？

A.At least every three years.

B.At least every four years.

C.At least every five years.

D.At least every six years.

What is the function of Language of Three？

A.For list, inventory, compile and expand.

B.For power.

C.For completeness, wholeness, and roundness.

D.For comparison and contrast.