H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 21

H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 21

1. Which of the following can speed up OSPF fast convergence? (Choose two.)

   • Configuring dynamic BFD for OSPF
   • Adjusting the interval at which OSPF calculation is performed
   • Configuring the interval at which an LSA are retransmitted
   • Configuring the maximum number of external LSAs in the LSDB

2. Which of the attributes must exist in the BGP Update messages? (Choose three.)

   • LOCAL_PREF
   • NEXT_HOP
   • ORIGIN
   • AS_PATH

3. Which of the following LSAs are flooded within a single area? (Choose three.)

   • Router LSA
   • Network LSA
   • Summary LSA
   • AS External LSA

4. BGP peers are automatically discovered by exchanging multicast packets.

   • True
   • False

5. Which statements about the Local-Preference attribute are true? (Choose two.)

   • Based on BGP route selection rules, the Local-Preference attribute has a lower priority than the Preferred-Value attribute. This means that BGP compares Local-Preference attributes of routes after comparing Preferred-Value attributes of them.
   • The Local-Preference attribute of a BGP route defaults to 0.
   • The Local-Preference attribute is used to select an exit point from the local AS for data flows. 
   • Based on BGP route selection rules, the Local-Preference attribute has a lower priority than the MED attribute. This means that BGP compares Local-Preference attributes of routes after comparing MED attributes of them.

6. The ABR of an NSSA will not advertise Type-4 and Type-5 LSAs to an NSSA but can import external routes into the NSSA.

   • True 
   • False

7. In transit AS, why do core routers run BGP?

   • Eliminate route loops
   • Ensure data packets can be transmitted to the external destination addresses 
   • Optimize network within an AS
   • Ensure only one export

8. Which command can trigger the advertisement of BGP routes without interrupting a BGP connection?

   • Reset bgp
   • Refresh bgp all external 
   • Refresh bgp all internal
   • RR-filter

9. Which of the following BGP filters can be used to set route attributes?

   • Ip-prefix
   • Route-policy 
   • As-path-filer
   • Community-filter

10. A BGP finite state machine has the following states:

    Active
    OpenConfirm
    Idle
    Establish
    OpenSent

    What is the state transition sequence in which the BGP peer relationship is established?

    • Idle-OpenSent-OpenConfirmActive-Establish
    • Idle-Active-OpenSent-OpenConfirm-Establish 
    • Active-Idle-OpenSent-OpenConfirm-Establish
    • Idle-Active-OpenConfirm-OpenSent-Establish

11. In OSPF protocol, which of the following elements are used by Network LSA to describe broadcast network segment or NBMA network segment? (Choose three.)

    • Link ID
    • Net mask
    • Attached Router list
    • Metric

12. When the import-route command is used to import routes to BGP, which statement is false?

    • The import-route command can import IGP routes, direct routes, and static routes to BGP.
    • A process ID must be specified if OSPF routes, or RIP routes are imported to BGP.
    • By default, the Origin attribute of imported routes is IGP.
    • Routing policies can be used to filter the routes imported from other routing protocols.

13. Which of the BGP attributes are Well-known mandatory attributes? (Choose three.)

    • ORIGIN
    • AS_PATH
    • NEXT_HOP
    • MED
    • LOCAL_PREF
    • COMMUNITY

14. Which of the following statements about an AS-External-LSA are true? (Choose three.)

    • The Link State ID field specifies the network segment address for an advertised destination.
    • The Advertising Router field specifies the Router ID of an ASBR.
    • The Net mask field specifies the network mask of an advertised destination.
    • The Link State ID and Advertising Router fields are used together to uniquely identify an AS-External-LSA.

15. Which of the BGP attributes is Optional transitive attribute?

    • ORIGIN
    • AS_PATH 
    • NEXT_HOP
    • MED
    • LOCAL_PREF
    • COMMUNITY

16. Which attributes are well-known community attributes? (Choose three.)

    • NO_EXPORT (0xFFFFFF01)
    • NO_ADVERTISE (0xFFFFFF02)
    • NO_EXPORT_SUBCONFED
    • AS(2Byte):Number(2Byte)

17. OSPF uses SPF algorithm to calculate SPF tree according to topology. Which of the following statements are correct regarding SPF tree node? (Choose two.)

    • The node on SPF tree indicates router and port.
    • There are two types of SPF tree nodeTransit node and Stub node. 
    • The router node on SPF tree is one type of Stub nodes.
    • The router node on SPF tree is one type of Transit nodes. 

18. What is the Origin attribute of the BGP route that is imported by using the import-route command?

    • IGP
    • EGP
    • Incomplete
    • Unknown

19. How does the route Community attribute set by routing policies affect route selection?

    • The Community attribute directly affects route selection, because it must be compared in route selection.
    • The Community attribute does not affect route selection, because it is a non-transitive attribute and cannot be transmitted between routers.
    • The Community attribute indirectly affects route selection. Routes are classified by the Community attribute. Different route attributes such as the Local-Preference and MED can be set for routes in different communities, which affects route selection. 

20. In OSPF area, RTA and RTB interconnect through FE interface. which of the following commands can be used to configure the link cost between RTA and RTB as 10? (Choose two.)

    • Use command “ospf cost 10” on two routers 
    • Use command “ospf cost 5” on two routers
    • Use command “bandwidth-reference 500” on two routers to change bandwidth-reference value
    • Use command “bandwidth-reference 1000” on two routers to change bandwidth-reference