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Which three IP multicast group concepts are true?（）

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多选题
Which three IP multicast group concepts are true?（）
A

If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.

B

A router does not have to be a member of a multicast group to receive multicast data.

C

A router must be a member of a multicast group to send to the group.

D

A router does not have to be a member of a multicast group to send to the group.

E

If a packet is sent to a multicast group address, all members of the multicast group will rece ive it.

F

A router must be a member of a multicast group to receive multicast data.

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相似问题和答案

第1题：

Which three statements are true about the Internet Group Management Protocol (IGMP)? ()

A. There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode

B. IGMP is used to register individual hosts with a multicast group

C. IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from

D. IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1

E. IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP

F. IGMP snooping ru ns on Layer 3 routers


参考答案：B, C, D

第2题：

Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1？（）

  • A、Before sending traffic, it must first join  multicast group 239.1.1.1 by sending an IGMPv2 membership report to the default router on the local subnet.
  • B、It must send an IGMPv2 Request to Send  packet and then wait for an IGMPv2 Clear to Send packet from the IGMPv2 querier router on the local subnet
  • C、It may begin transmitting multicast traffic to the group only when there is no other host transmitting to the group on the local subnet.
  • D、It may transmit multicast traffic to the group at any time. 

正确答案:D

第3题：

Which three IP addresses are valid multicast addresses?()

A. 169.254.23.59

B. 223.254.255.254

C. 225.1.1.1

D. 227.43.34.2

E. 238.3.3.3

F. 249.1.2.3


参考答案：C, D, E

第4题：

Which three IP multicast address related statements are true？ （Choose three.） （） 

  • A、Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted  with Time to Live （TTL） greater than 1.
  • B、Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers.
  • C、Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link-local addresses used by PIMv2 and  IGMPv3.
  • D、Because they would map to overlapping IP multicast MAC addresses， multicast addresses 224.0.1.1  and 238.1.1.1 could not be used together.
  • E、Multicast address 224.0.1.1 has been reserved for the Network Time Protocol （NTP） by the IANA
  • F、The administratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in  purpose to RFC 1918 private unicast addresses.

正确答案:C,E,F

第5题：

When building an IP multicast domain using PIM which mode assumes  that other routers do not want to forward multicast packets for the group?（）

  • A、PIM - DM
  • B、PIM - SM
  • C、PIM - RP
  • D、CGMP
  • E、IGMP snooping

正确答案:B

第6题：

When building an IP multicast domain using PIM which mode assumes that other routers do not want to forward multicast packets for the group?()

A. PIM - DM

B. PIM - SM

C. PIM - RP

D. CGMP

E. IGMP snooping


参考答案：B

第7题：

Which three IP multicast address related statements are true?（）

  • A、Multicast addresses 224.0.0.13 and 224.0.0.22 are reserved link - local addresses used by PIMv2 and IGMPv3
  • B、Because they would map to overlapping IP multicast MAC addresses, multicast addresses 224.0.1.1 and 238.1.1.1 could not be used toget her
  • C、Multicast addresses 224.0.0.0 through 224.0.0.255 are always forwarded because they are transmitted with Time to Live (TTL) greater than 1
  • D、Multicast addresses 224.0.0.5 and 224.0.0.6 are source multicast addresses for OSPF routers
  • E、The a dministratively scoped multicast addresses 239.0.0.0 through 239.255.255.255 are similar in purpose to RFC 1918 private unicast addresses
  • F、Multicast address 224.0.1.1 has been reserved for the Network Time Protocol (NTP) by the IANA

正确答案:A,E,F

第8题：

Which two statements are true about Internet Group Management Protocol (IGMP) snooping?()

A. IGMP snooping and Cisco Group Membership Protocol (CGMP) can be used simultaneously on a switch.

B. IGMP snooping a nd Cisco Group Membership Protocol (CGMP) were developed to help Layer 3 switches make intelligent forwarding decisions on their own.

C. IGMP snooping examines IGMP join/leave messages so that multicast traffic is forwarded only to hosts that sent an IG MP message toward the router.

D. IGMP snooping is an IP multicast constraining mechanism for Layer 2 switches.

E. IGMP snooping is enabled with the ip multicast - routing global configuration command.


参考答案：C, D

第9题：

Which three IP multicast group concepts are true?（）

  • A、If a packet is sent to a multicast group address, the multicast frame contains the source multicast address.
  • B、A router does not have to be a member of a multicast group to receive multicast data.
  • C、A router must be a member of a multicast group to send to the group.
  • D、A router does not have to be a member of a multicast group to send to the group.
  • E、If a packet is sent to a multicast group address, all members of the multicast group will rece ive it.
  • F、A router must be a member of a multicast group to receive multicast data.

正确答案:D,E,F

第10题：

Which three attributes are carried in a source active message?（）

  • A、NLRI information
  • B、IP address of originating RP
  • C、address of multicast source
  • D、all active RPs in the local domain
  • E、group address to which the source is sending

正确答案:B,C,E

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