On the OSPF network shown in the figure, R1, R2, and R3 run OSPF, and R1 advertises four VPN routes to OSPF. A filter-policy needs to achieve the following goal: R1's and R3's routingtables contain the routes to
192.168.3.0/24, but R2's routing table does not. Which of the following filter-policies cannot meet this requirement?

• A.A filter-policy on R2 for filtering received routes
• B.A filter-policy on R2 for filtering the routes to be advertised
• C.A filter-policy on R1 for filtering the routes to be imported
• D.A filter-policy on R1 for filtering the imported routes to be advertised

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What does the display current-configuration | include vlan command mean?

• A.View the physical interface information bound to each VLAN
• B.View all configurations containing the "VLAN" keyword
• C.Check the IP address of the VLANIF interface
• D.Check which VLANs are currently created

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Which of the following descriptions of OSPF special areas is incorrect?

• A.The difference between the Stub area and the NSSA area is that detailed inter-area routes are not allowed to exist in the Stub area.
• B.The difference between a Stub area and a Totally Sub area is that detailed inter-area routing is allowed in the Stub area.
• C.The difference between the NSSA area and the Stub area is that the NSSA area allows the introduction of external routes to the autonomous system, and the ASBR issues Type 7 LSA advertisements to the area.
• D.The role of the Totally Stub area is to allow the ABR to publish Type 3 LSA default routes, and does not allow the existence of autonomous system external routes and inter-area routes.

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Option 82 in the DHCP message is called the relay agent information option, and the administrator can obtain a lot of client information from it. Option 82 can contain at most () Sub-Options.

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Regarding the description of IGMP Snooping-working mechanism, which is the correct?

• A.The layer 2 switch establishes and maintains the PIM routing table on the layer 2 by continuously monitoring IGMP messages.
• B.When IGMP Snooping is not running, the multicast message will be broadcast on the second layer.
  After running IGMP Snooping, the message will no longer be broadcast on the second layer, but will be multicast on the second layer.
• C.If the host sends an IGMP host report message, the switch will delete the multicast entry corresponding to the hos.t
• D.If the host sends an IGMP leave message, the switch will add the host to the corresponding multicast table.

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