QUESTION: 13

The router HW1 and the router HW2 are connected to the network A and the network B, respectively. As shown in the figure below, if you want to establish IPsec VPN between router HW1 and router HW2.

rule permit ip source 192.168.1.10 destination 192.168.1.2 0
rule permit ip source 10.1.1.0 0.0.0.255 destination 192.168.1.2 0
rule permit ip source 10.1.1.0 0.0.0 .255 destination 10.1.2.0 0.0.0.255
rule permit ip source 192 .168.1.10 destination 10.1.2.0 0.0.0.255
rule permit ip source 10.1.2.0 0.0.0 255 destination 10.1.1.0 0.0.0.255

Answer(s): C

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QUESTION: 14

Which of the following options describes the assertion mechanism correctly?

The size of the IP address will not be used as a condition for the election of the winner.
In assertion mechanismThe winner is responsible for forwarding multicast data to the broadcast network segment.
The assertion mechanism is used for DR election.
In the assertion mechanism, the loser will shut down is the interface connected to the broadcast network.

Answer(s): B

Explanation:

The router receives the same multicast traffic from the downstream interface again, then it starts the assertion mechanism and sends the assert message, including: routing protocol priority, cost, and packet source IP (preferably larger). The routing protocol priority and cost are the source's IGP route. After comparison, the winner is selected, and the loser is the loser. Loser will prune the downstream interface and will continue to send pruning messages to the upstream. However, a pruning message is also sent to the downstream to detect whether there is a downstream receiver. The downstream receiver router will send a join message to the upstream router to suppress pruning. Eventually the link does not turnsend traffic.

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QUESTION: 15

If there are multiple receivers in a multicast group, the administrator enables IGM on the switch connecting the receiversP Snooping function, when the receiver changes from When the switch receives the general group query message from the querier, how should multiple receivers respond?

The first receiver whose response time times out is sentReport messages are not sent by other receivers.
Only run ICMPv2, all receivers will respond to the Report message.
Only when IGMPvI is running will all receivers respondReport message.
All recipients will respondReport message

Answer(s): D

Explanation:

IGMP Snooping is to monitor IGMP protocol packets.
IGMPSnooping is the same as IGMP. Both are used for multicast group management and control, and they both use IGMP packets. IGMPagreement line at the network layer, while the IGMP Snooping runs at the link layer, when the Layer 2 Ethernet switch receives the IGM transmitted between the host and the routerP message, IGMP Snooping analyzes the information carried by IGMP packets, and establishes and maintains MAs at Layer 2C table, the multicast packets sent from the router in the future will be forwarded according to the MAC table. IGMP Snooping will actively send IGMP specific group query packets to the port only when it receives an IGMP leave packet from a port or the aging time timer of a port expires.
IGMPmessage.

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QUESTION: 16

If PIM-SM is run in a multicast network, a multicast forwarding tree needs to be built between the multicast source and the receiver so that the receiver can receive the multicastvalid data, which of the following options are correct for the built tree tracing?

multicast source andThe SPT tree is constructed between RPs
The RPT tree is constructed between the RP and the receiver
multicast source andThe RPT tree is constructed between RPs
The SPT tree is constructed between the RP and the receiver

Answer(s): A,B

Explanation:

Build source tree SPT between multicast source and RP Build shared tree RPT between RP and receiver
Finally, the source tree SRT is constructed between the multicast source and the receiver

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QUESTION: 13

QUESTION: 14

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QUESTION: 15

Explanation:

QUESTION: 16

Explanation: