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Question: 31
The multicast source device does not necessarily belong to the multicast group. It sends data to the multicast group, and may not be a receiver. ( )
A. True
B. False
Answer: A Question: 32

Which of the following is the destination address of a multicast packet? ( )
A. 224.0.0.1
B. 239.123.234.255
C. 244.1.1.3
D. All of the above
Answer: A, B
Question: 33
Which of the following is an intra-domain multicast routing protocol? ( )
A. MBGP
B. MSDP
C. PIM-SM
D. PIM-SM
Answer: C, D
Question: 34
The range of the Local management multicast addresses is ( ).
A. 224.0.0.0224.0.0.255
B. 224.0.1.0237.255.255.255
C. 238.0.0.0238.255.255.255
D. 239.0.0.0239.255.255.255
Answer: D

Question: 35
The length of PAUSE MAC control frame defined in IEEE802.3x is ( ).
A. 16 bytes
B. 32 bytes
C. 64 bytes
D. 96 bytes
Answer: C
Question: 36
The multicast distribution tree falls into ( ).
A. The shortest path tree
B. The best path tree
C. The shared distribution tree
D. The independent distribution tree
Answer: A, C

Question: 37
Based on UDP, multicast applications do not provide congestion avoidance mechanism. Therefore, duplication or un-sequence of the packets may occur. ( )
A. True

B. False
Answer: A

Question: 38
IGMP is a multicast signaling protocol between the hosts and the router in the existing IP network. ( )
A. True
B. False
Answer: A

Question: 39
IGMP has three versions: v1, v2 and v3. Which of the following statements is right about the three versions? ( )
A. There are definite documents about specifications of the three versions.
B. IGMP v1 defines only the basic query and report of the members.
C. Based on v1, IGMP v2 adds a mechanism for the members to quit the group quickly.
D. Based on v2, IGMP v3 adds the active control of multicast sources, that is, a member can define which multicast group it wants to receive multicast packets from.
Answer: A, B, C, D

Question: 40
What protocol messages in IGMP v2 will be used for the maintenance of the multicast group information between the router and the hosts? ( )
A. Join group message
B. Leave group message
C. General query message
D. Group-Specific query message
E. Membership report message
Answer: B, C, D, E

Question: 41
When an IGMP v2 host needs to receive the flows of multicast group 239.0.0.1, the destination address of the membership report message sent by the host is ( ).
A. 224.0.0.1
B. 224.0.0.2
C. 224.0.0.13
D. 239.0.0.1
Answer: A

Question: 42
When an IGMP v2 host is about to quit multicast group 239.0.0.1, which of the following statements is right? ( )
A. The multicast address of the leave group message sent by the host is 224.0.0.1.
B. The multicast address of the leave group message sent by the host is 224.0.0.2.
C. The multicast address of the leave group message sent by the host is 224.0.0.13.

D. The multicast address of the leave group message sent by the host is 239.0.0.1.
Answer: B

Question: 43
If there are multiple multicast routers in a LAN, only one router needs to process the query messages. This is to reduce the amount of query packets in the network. Which of the following statements is right about the querier?
A. Any multicast router in the LAN can be the querier.
B. Upon starting, every multicast router in the LAN regards itself as the querier.
C. If the querier receives a query packet whose source IP address is smaller than the IP address of itself, the querier will stop sending query packets and become a non-querier.
D. If the querier receives a query packet whose source IP address is greater than the IP address of itself, the querier will stop sending query packets and become a non-querier.
Answer: A, B, C

Question: 44
The host will take some measures after receiving a query message to improve efficiency. Which of the following statements is right about these measures? ( )
A. All hosts respond after a random delay, which must be less than the maximum query response time in the query message.
B. All hosts respond after a random delay, which is not limited.
C. If the host detects that other host has sent a response, it will stop response.
D. The host does not monitor other hosts response, it will send the response packet once the random delay expires.
Answer: A, C

Question: 45
Which of the following statements is right about IGMP? ( )
A. Compared with IGMP v2, IGMP v1 does not define the group leave message and specific group query message. Therefore, an IGMP v1 router can only determine whether there is any member in the multicast group through the timer mechanism.
B. Compared with IGMP v2, IGMP v1 does not define queriers. Therefore, all routers in the IGMP v1 network are queriers.
C. IGMP v3 is enhanced with report messages for the designated source and members. Therefore, IGMP v3 can filter the flows of some sources, and receive the flows of specific sources only.
D. Compatible with IGMP v2and IGMP v1, IGMP v3 contains all the messages defined in v2 and v1.
Answer: A, C, D
Question: 46
VLAN can be defined based on ( ).
A. IP addresses
B. Network layers
C. MAC addresses
D. Ports

Answer: A, C, D

Question: 47
If a network has both IGMP v1 router and IGMP v2 router, the working status of the IGMP v2 router shall be ( ).
A. The IGMP v2 router shall work in the compatible mode of IGMP v1, that is, all the sent protocol packets are compatible with the format of IGMP v1 protocol packets.
B. The IGMP v2 router shall work in the IGMP v2 mode, and become the querier. The IGMP v1 router does not process the query messages.
C. When the IGMP v2 router detects that the IGMP v1 router no longer exist in the network, the working mode will transfer from the compatible mode to the IGMP v2 mode automatically.
D. Routers of two versions cannot work together. You should ensure that the routers in the LAN use the same version.
Answer: D

Question: 48
If a network has both IGMP v1 and IGMP v2 hosts, and the router runs IGMP v2.The working status of the router will be ( ).
A. The IGMP v2 router will work in the IGMP v1 compatible mode, that is, all sent protocol packets are compatible with the format of IGMP v1 protocol packets.
B. The IGMP v2 router will work in the IGMP v2 mode, and the IGMP v1 hosts cannot receive any multicast flow.
C. When the IGMP v2 router detects that all IGMP v1 hosts quit, the IGMP v1 compatible mode will transfer to the IGMP v2 mode automatically.
D. IGMP v1 hosts and IGMP v2 router cannot work together. You should ensure that the hosts and routers in the LAN use the same version.
Answer: A, C

Question: 49
IGMP works at Layer-3 between the router and host only. However, some special technologies are needed in the Layer-2 switching network to implement the maintenance of multicast table entries. Which of the following statements is right about Layer-2 multicast? ( )
A. In the Layer-2 switching network, IGMP snooping is most widely used.
B. IGMP snooping sets up the multicast forwarding entries through monitoring the membership report message between the hosts and router.
C. After the switch receives a query message of the router, it needs to forward the query message to all the members.
D. When the switch receives multiple query response packets of the same multicast group, it needs to forward only one response packet to the router.
Answer: A, B, C, D
Question: 50
To run IGMP on a H3C switch, which of the following commands is necessary? ( )
A. [H3C-interface-vlan1] pim dm
B. [H3C-interface-vlan1] igmp enable
C. [H3C-interface-vlan1] igmp version 2
D. [H3C] multicast routing-enable

Answer: B, D

Question: 51
Which of the following statements describes the command igmp host-join 225.0.0.1 port interface Ethernet 0/1 correctly? ( )
A. Only allow the hosts under port 0/1 to join in multicast group 225.0.0.1, and the hosts attached to other ports are denied.
B. Allow the hosts under port 0/1 to join in multicast group 225.0.0.1, and the other hosts attached to other ports can also join in the group.
C. Simulate a host under port 0/1 to join in multicast group 225.0.0.1, and port 0/1 is permanently in the forwarding list of the multicast group.
D. Simulate a host under port 0/1 to join in multicast group 225.0.0.1, and port 0/1 is not in the forwarding list of the multicast group.
Answer: C

Question: 52
For the H3C switch that supports both IGMP and IGMP snooping, which of the following statements is correct? ( )
A. [H3C-interface-vlan1] igmp enable is used to enable IGMP.
B. [H3C-vlan1] igmp enable is used to enable IGMP.
C. [H3C-interface-vlan1]igmp-snooping enable is used to enable IGMP snooping.
D. [H3C]igmp-snooping enable is used to enable IGMP snooping.
Answer: A, D

Question: 53
On a H3C switch, which IGMP versions can be used? ( )
A. IGMP version 1
B. IGMP version 2
C. IGMP version 3
D. All of the above
Answer: A, B

Question: 54
The higher version of IGMP is compatible to the lower version. Therefore, the versions of IGMP configured on a subnet can be different. ( )
A. True
B. False
Answer: B

Question: 55
Which of the following reserved multicast address is used for the transmission of protocol packets by PIM? ( )
A. 224.0.0.5
B. 224.0.0.13
C. 224.0.0.9
D. 224.0.0.2

Answer: B

Question: 56
In a PIM-DM multicast environment, if there is no multicast data receiver on all export ports of the router, the router will clear the export list of the forwarding entry and send a pruning message to inform the RPF upstream router to stop sending the multicast data to itself.
A. True
B. False
Answer: A

Question: 57
Which of the following is right about the GARP application? ( )
A. The switches in a network domain automatically share the VLAN information and multicast group configuration information.
B. The whole switching network can be monitored precisely through a switch.
C. The changed VLAN or multicast group configuration will be advertised to the whole switching network dynamically, thus reducing the maintenance cost and improving the reliability.
D. Plug-and-play of VLANs and multicast groups are implemented.
Answer: A, B, C, D

Question: 58
In a PIM-DM multicast environment, after the RPF upstream router receives the pruning message sent by the downstream multicast router that indicates there is no receiver, there will be no multicast data forwarded to the downstream direction.. ( )
A. True
B. False
Answer: B

Question: 59
In a PIM-DM multicast environment, the solicitation of the router to receive data will be rejected by the RPF upstream router within the pruning and flooding period.
A. True
B. False
Answer: B

Question: 60
Due to the pruning-flooding mechanism of PIM-DM, the router will repeat the creation process ceaselessly to maintain the forwarding entry.
A. True
B. False
Answer: B

H3C https://www.pass4itsure.com/LOT-985.html Exam Certification Guide presents you with an organized test preparation routine through the use of proven series elements and techniques.“Do I Know This Already?”quizzes open each chapter and allow you to decide how much time you need to spend on each section. H3C GB0-323 lists and Foundation Summary tables make referencing easy and give you a quick refresher whenever you need it.Challenging H3C GB0-323 review questions help you assess your knowledge and reinforce key concepts. H3C GB0-323 exercises help you think about exam objectives in real-world situations,thus increasing recall during exam time.

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