It is possible to prevent the HSB backup channel between the active and standby ACs from being interrupted and unperceivable through mechanisms such as sending active and standby service packets and retransmissions.

• A.False
• B.True

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Which of the following description of the OSPF default route is false?

• A.The Autonomous System Boundary Router (ASBR) publishes Type5 external province ASELSA, or Type7 external default NSSALSA, which is used to guide the routers in the autonomous system (AS) to access the outside of the autonomous system
• B.OSPF routing can be issued by the area border router (ABR) Type3 default Summary LSA, used to guide the routers in the area to forward packets between areas
• C.Due to the hierarchical management of OSFP routing, the priority of Type5/7 missing routing is higher than Type3 routing
• D.When the router does not have an exact matching route, it can forward packets through the default route

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Regarding BGP MED, which of the following descriptions are correct? (Multiple choice)

• A.By default, if the MED value is not set in the route attribute, press the process. If the bestroute med-none-as maximum command is configured. Then handle the maximum MED value of 4294967295
• B.By default, BGP routing rules can compare the distance between routes from different autonomous systems.
• C.The default value of BGP route MED is 0
• D.In BGP routing rules, the priority of MED is lower than AS-Path, Preferred-Value, Local-Preference, Origin

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After the modular switch receives the business message, it is processed by the upstream interface board, then processed by the downstream interface board, and finally sent from the interface.

• A.FALSE
• B.TRUE

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Regarding the matters needing to be attention in configuring the Stub area, which of the following description of is true?

• A.The backbone area can be configured as a stub area
• B.If an area is configured as a stub area, all routers in the area must be configured with stub area attributes
• C.The virtual link can traverse the stub area
• D.ASBR can exist in the stub area

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