Which of the following scenarios does not require RPF checking? (Single choice questions).

• A.When the RP in PIM SM establishes the source tree to the multicast source
• B.When a pruning message is received in PIM SM
• C.When a router in PIM SM receives multicast traffic when a shared tree is established to an RP in PIM SM

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The data results of a router are as follows, and the analysis conclusion is correct (single choice).

• A.The GEO/0/0 port of the R3 is in a different region than the neighbor
• B.R3 is on the link where Eth0/0/0 is Eth0/ 1 of the LEVEL-1 and Level-2 DISC
• C.R3 routers Circuit-level is Level-1-2
• D.The R3 router's Eth0/0/1 enables both IPv4 and IPv6 ISIS

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Which of the following attacks are DoS (Denial of servioe) attacks? (Multiple choice question)

• A.Man-in-the-middle attack
• B.Single packet attack
• C.Source P address spoofing attack
• D.Flood Attack

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The following is the correct description of the aggregation of BGP (radio).

• A.After you configure the Aggregate ipv4-address mask, only aggregate routes are published, not detail routes.
• B.Routes in the BGP local route table can be manually aggregated.
• C.For IPv6 routing, BGP supports manual aggregation and automatic aggregation.
• D.BGP enables automatic aggregation by default.

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About multi-instance CE (Multi-VPN-Instance CE, MCE).
What is the error described below?

• A.On the MCE device, you need to create their own routing tables for different VPNs and bind to the corresponding interface
• B.MCE-enabled devices can access multiple VPI instances in BGP/RPLS IPVPN applications, reducing user network equipment investment
• C.The MCE vs. PE direction must have multiple physical links to achieve isolation between different VPN instances
• D.Users who connect to the same MCE but are not part of a VPN instance cannot access each other

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