About this section configuration, which of the following descriptions are correct? (Multiple choice)

• A.region-name RegionA command configures the MST region name of the switch. By default, the MST region name of the switch is the MAC address of the switch.
• B.Use the instance 2 vlan 3 command is used to map VLAN 3 to MST Instance 2. All the default VLANs are mapped to Instance 1.
• C.The revision-level 1 is used to configure the MSTP revision level. The value range is 0 to 65535. By default, the MSTP revision level is 1.
• D.stp mode mstp command is used to enable the MSTP feature of the switch. By default, MSTP is switched on.
• E.The active region-configuration command is used to activate the configuration of the MST region. If you do not perform this operation, the configured domain name, VLAN mapping table, and MSTP revision level do not take effect.

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After configuring multicast load sharing, which of the following may occur? (Multiple choice)

• A.When the load on the equal-cost route is equal, the traffic may be unbalanced. This is because the group load balancing is based on multicast routing entries rather than multicast data packets.
• B.After the multicast load balancing is configured, load balancing on the equal-cost routes is guaranteed.
• C.Multicast load sharing can also work if there is no thin equal-cost route
• D.When using load balancing by group, load balancing on equal-cost routes cannot be guaranteed due to the limitation of the hash algorithm itself.

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Which of the following descriptions are correct about BGP Local-Preference? (Multiple Choice)

• A.In the BGP routing rule, the Preferred-Value has a higher priority than the Local-Preference, that is, the Preferred-Value is prioritized.
• B.BGP Local-Preference is usually used in the routing rule policy to control how data flows into As
• C.The default value of BGP route Local-Preference is 100.
• D.In the BGP routing rules, the priority of the MED is higher than the Local-Preference, that is, the priority is compared with the MED.

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Regarding the description of OSPF external route types, which is wrong?

• A.The cost of the second type of OSPF external route is AS external cost.
• B.The cost of the first external route of OSPF is the sum of the internal cost of AS (the router-to-ASBR overhead) and the AS external cost.
• C.With the same other conditions, the first type of external route of OSPF is always preferred over the second type of external route.
• D.OSPF is divided into the first type of external routes and the second type of external routes.

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Which description of the OSPF protocol in the following is wrong?

• A.The area border router (ABR) connects multiple areas and maintains the same LSDB for all areas.
• B.The metric value of AS-external-LSA can be specified when external routes are imported. The default value is 1.
• C.The external routing information can carry a tag. The tag information is contained in 5 LSAs and 7 LSAs.
• D.The Link State ID in ASBR-Summary-LSA is set to the router ID of this ASBR.

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