As shown in the figure, all interfaces of the router enable OSPF. The IP address identified in the figure is the IP address of the oopback0 interface of the device. Loopback0 of R1 and R2 is advertised in area 1, Loopback0 of R4 is advertised in area 0, and Loopback0 of R3 and R5E are advertised in area 2, which of the following IP addresses can ping each other? (Multiple choice)

• A.10.0.2.2 and 10.0.3.3. (Not counted when receiving Category 3 in non-backbone areas)
• B.10.0.2.2 and 10.0.5.5 (not counted when receiving Category 3 in non-backbone areas)
• C.10.0.3.3 and 10.0.5.5 (Class 1 in the same area)
• D.10.0.4.4 and 10.0.2.2. (3 types of normal calculation)

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As shown in the figure, the network has a loop because STP is not enabled. Which of the following phenomena may be bowed?

• A.MA, CAddress table flapping
• B.The device will generate a loop alarm
• C.Hostreceive a large number of broadcasts
• D.equipmentCPUOccupancy is too high

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The RR rules for advertising routes violate the IBGP split horizon rules, which may cause loops in the AS. Which routing attributes does RR use to prevent loops?

• A.Cluster List k
• B.Originator ID
• C.AS-PATH
• D.Nexthop

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The OSPF protocol runs between CE and PE, when CE1 advertises the route of the site to CE2. Which of the following description is wrong?

• A.When PE2 receives the same Domain ID as the local BGP route sent by PE1, for Type3 LSA, PE2 will generate Type5 LSA
• B.The Domain ID configured by PE1 can be used as an extended community attribute of BGP and sent along with the route to PE2.
• C.When PE2 receives the same Domain ID as the local BGP route sent by PE1, PE2 will generate Type3 LSA for Type1 LSA and Type2 LSA
• D.When PE2 receives a BGP route from PE1 that carries a different Domain ID from the local one, it is correct for all LSAs, and PE2 will generate Type5 LSA or Type7 LSA

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Network administrator A wants to check the neighbor status of BGP router R2. R2's BGP neighbor status information is shown in the figure. Please help network administrator A to obtain the following information: The AS where R2 is located is AS (). (Note: Only write numbers, do not add punctuation or spaces)

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