The illustration is a BGP multi-exit enterprise network. Which of the following statements is true about BGP deployments in multi-egress enterprise networks:

• A.In mode (2), RTC can reach the Internet through part of the Internet specific routes and through the IGP protocol according to its own strategy.
• B.Usually, in mode (3) RTC can choose the optimal path to access Interner through IGP according to its own strategy.
• C.In mode (1), RTC can choose one of the default routes through IGP to reach the Internet according to its own strategy.
• D.In a BGP multi-exit enterprise network, there can be (1) ISP only advertises default routes, (2) ISP advertises part of default routes and Internet specific routes, (3) ISP advertises all Internet routes.

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Among the following types of LSAs, they must be generated by ASBR: ______

• A.Tpe1 LSA
• B.Tpe2 LSA
• C.Tpe7 LSA
• D.Tpe4 LSA

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In the OSPF protocol, the correct statement about ABR aggregation is ______

• A.When the ABR colleague is also a conversion router in the NSSA area, the Tpe5 LSA converted from the Tpe7 LSA can be aggregated
• B.ABR can aggregate Tpe4 LSA not generated by itself
• C.ABR can aggregate all Tpe5 LSAs
• D.ABR can aggregate Tpe3 LSA

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If the link layer protocol of the OSPF interface is ATM, its default network type is _______.

• A.Broadcast
• B.P2MP
• C.P2P
• D.NBMA

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In the IS-IS network as shown in the figure, the configuration of the authentication part of each router is as follows:
RTA-Serial2/0]isis authentication-mode md5 h3c
RTB-isis-1]area-authentication-mode md5 h3c
RTC-isis-1]domain-authentication-mode md5 h3c
Then on RTB, the state of RTA neighbor relationship is ______; while RTC______ RTB Level-1 LSP packets

• A.up ; reject
• B.down ; reject
• C.up; accept
• D.down ; accept

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