Which of the following are the techniques for improving MPLS BGP VPN reliability? (Multiple Choice)

• A.VPN FRR
• B.Configure CE dual-homing networking at the access layer.
• C.Private network IP routing between the PE and the CE FRR
• D.VPN GR

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Which of the following options is correct for the description of the optimal routing elections for various protocols?

• A.BGP selects the optimal route to the same destination network segment by comparing the cost value of the route entry.
• B.Different routing entries learning from BGP and OSPF to the same destination network segment select the optimal route to join the IP routing table by comparing the preference value of the protocol.
• C.The route with the next hop unreachable in BGP is also put into the IP routing table.
• D.OSPF puts all routing information in the LSDP into the IP routing table.

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As shown in the figure, Between R1 and R2 are PPP links and the direct connection ports are not on the same network segment, but the R1 and R2 direct connection ports can communicate, and the Ethernet link cannot communicate under the same IP planning, what are the reasons? (Multiple Choice)

• A.R1 and R2 are connected to the POS port and learns the MAC address of the peer interface through LCP, and does not require the ARP request MAC address.
• B.R1 and R2 are connected to the POS port, and the 32-bit host route of the direct connection port of the other party is learned through IPCP.
• C.The data packets of the interconnected POS interface of R1 and R2 do not need to encapsulate the Ethernet header, and do not need to use ARP to request the MAC address.
• D.R1 and R2 are connected to the POS port, and the 24-bit subnet route of the direct connection port of the other party is learned through IPCP.

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On an MPLS VPN network, different CEs can use different routing protocols to exchange routing information with the same PE. These routing protocols are independent from one another.

• A.True
• B.False

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