In MPLSVPN, in order to distinguish between IPv4 prefixes that use the same address space, the RD value is added to the IPv4 address, and the following options are described correctly as?

• A.RD can be used to control the publication of VPN routing information
• B.On a PE device, each VPN instance corresponds to an RD value, and the RD value must be unique on the same PE device
• C.RD is encapsulated in the Update message as an extended community attribute of BGP during delivery
• D.After the PE receives an IPv4 route from CE, it adds an RD to the route to IPv4 that translates to a globally unique VPN-IPv4 route and publishes it on the public network

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In the forwarding table of the switch, a MAC address can correspond to only one outlet at a time

• A.False
• B.True

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Level-1-2IS transmits Level-2LSP to the Level-1 area if the AT location 1 in Level-2LSP is delivered It means that the Level-1lS in the area can be accessed to the outer area through Level-1-2IlS

• A.True
• B.False

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There is an existing network of router RI, router R, router R3, and router R4. The 4 routers are interconnected via an LN network. All 4 routers are equipped with basic oSPF. When you execute the command "displayosp" on router R2 f peer", router R2 and router R3 are discovered. The status between is "2-way".
So what conclusions can you draw from this output? (Multiple choice questions).

• A.Router R4 is destined for DR
• B.There is no full adjacency between router R2 and router R3
• C.Router R2 is not a DR
• D.Router R3 is not a DR, nor is it a BDR
• E.Router R2 is DR or BDR

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RD is used to distinguish between the same IP address in different VPNs, and how many bits (radio) the RD contains

• A.32
• B.16 D,128
• C.64

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