Which command is used to query the aging time of the firewall session .

• A.display firewall session table verbose
• B.display firewall packet-filter default all
• C.display firewall session table
• D.display firewall server-map

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Refer to the exhibit.

As shown in the figure, RTA, RTB, RTC, and RTD are connected through a switch. From small to large in order of the MAC address, the four routers are arranged as follows:
RTB, RTA, RTD, and RTC. The Level-2 DIS priority is set to 100 on RTB and RTD, and IS-IS BFD is enabled on all these routers. When the links of RTB are down, how should IS-IS BFD sessions be set up?

• A.Level 2 IS-IS BFD sessions are set up among RTA, RTC, and RTD, and a level 1 IS-IS BFD session is set up between RTC and RTD.
• B.Level 1 and level 2 IS-IS BFD sessions are set up among RTA, RTC, and RTD.
• C.Level 2 IS-IS BFD sessions are set up between RTD and RTA as well as between RTD and RTC, and a level 1 IS-IS BFD session is set up between RTC and RTD.
• D.Level 1 and level 2 IS-IS BFD sessions are set up only between RTC and RTD

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As shown in the figure, RTA, RTB, and RTC use the OSPF protocol. The default cost value is used for links, and unicast routes converge on the entire network. The Loopback 0 interface is set to configure RTC as the RP or BSR. The SPT switching threshold uses the default value on RTB. The receiver joins the multicast group 225.1.1.1. The multicast source sends multicast data to the destination address 225.1.1.1. Which interface is the inbound interface in the (10.1.1.1, 225.1.1.1) entry on RTB?

• A.Null
• B.Ethernet 2/0/0
• C.Ethernet 1/0/0
• D.Ethernet 1/0/1

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Which of the following statements about the VPLS packet forwarding are true?

• A.If the destination MAC address of a packet is not a broadcast address and a PE has not learned the MAC
  address, the broadcast this packet in one VSI
• B.If a PE receives broadcast packets from a local user, the PE forwards the packets to all other interfaces
  In the same VSI and all other PEs.
• C.If a receive broadcast packet sent a remote PE, it forwards the packet only to the AC interface instead of
  other PEs.
• D.If the destination MAC address of a packets is not a broadcast address and a PE has not learned the
  MAC address, the PE broadcast this packet in on VSI.

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If a (*, ) entry exists in the RP, Which of the following statements about the source registration are true in
PIM_SM?

• A.The first-hop RD connecting to the source sends received multicast data to the RP ho[p by hop.
• B.The RP unicast a registration stop message to the first router connection to the multicast source.
• C.The RP encapsulates registration information and uses RTP to send data packet to be sent to the
  multicast group to the outbound interface.
• D.The RP sends an (S, G) join message hop by hop to the first hop DR connected to the multicast source to
  add the multicast source to the SPT.
• E.The first hop DR connecting to the source encapsulate received multicast into PIM registration
  information and unicast the encapsulated information to the PR.

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