H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 24

H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 24

1. Based on BGP route selection rules, the route with the smallest MED value is preferred.

   • True
   • False

2. In the VRP, by default, a BGP router automatically retransmits an Update packet to its BGP peer after the outbound routing policy of the BGP peer changes.

   • True 
   • False

3. How does a BGP router process the received route whose next hop is unreachable?

   • The BGP router sends an error message to the router that has sent the Update message.
   • The BGP router accepts this route and adds it to the BGP routing table. This route, however, is neither preferred nor added to the IP routing table for packet forwarding. 
   • The BGP router refuses this route.
   • The BGP router accepts this route and adds it to the BGP routing table. This route can participate in route selection and may be selected as the optimal route to be added to the IP routing table for packet forwarding.

4. IGP routes can be installed into the BGP routing table by running either the network or import-route command.

   • True 
   • False

5. Which statements about the process of establishing a BGP peer relationship are true? (Choose three.)

   • There may be two TCP connections during the establishment of the BGP peer relationship. 
   • If two TCP connections are established between BGP peers, one connection functions as the primary connection, and the other as the backup connection.
   • If two TCP connections are established between BGP peers, one TCP connection is torn down.
   • If there are “multiple” TCP connections between BGP peers, BGP keeps the TCP connection initiated by the peer with a greater BGP router ID.

6. Which of the BGP attributes will not be advertised to other neighbor AS?

   • LOCAL_PREF 
   • AS_PATH
   • COMMUNITY
   • ORIGIN

7. Which statements about BGP route advertisement are true? (Choose two.)

   • All BGP routes learned from BGP peers are advertised to other BGP peers.
   • Only the routes learned from an IGP are advertised to other BGP peers.
   • By default, the routes learned from IBGP peers are not advertised to other IBGP peers. 
   • Only the optimal routes are advertised to other BGP peers. 

8. An Autonomous System (AS) is a set of routers under a single technical administration, using the same routing policy.

   • True 
   • False

9. Which statements about the AS number range are true? (Choose three.)

   • If 2-byte AS numbers are supported, a private AS number ranges from 32768 to 65535.
   • If 2-byte AS numbers are supported, a private AS number ranges from 64512 to 65535.
   • If 2-byte AS numbers are supported, an AS number ranges from 1 to 65535.
   • If 4-byte AS numbers are supported, a 4-byte AS number is in the x.y format. Here, “x” and “y” are integers ranging from 1 to 65535 and 0 to 65535 respectively.

10. Which BGP attributes are optional in a BGP Update packet? (Choose two.)

    • Origin
    • Nexthop
    • Local-Preference
    • MED

11. BGP is an exterior gateway protocol which runs among ASs. It focuses on routes control and selection of optimal routes rather than discovery and calculation of routes.

    • True 
    • False

12. When a TCP connection works properly, what is the status of the BGP peer relationship if the peer AS number configured for a BGP router is inconsistent with the AS number of its BGP peer?

    • Idle
    • Active 
    • OpenSent
    • Establish

13. The BGP Community attribute is a well-known mandatory attribute.

    • True
    • False

14. Which of the followings is used to avoid route loops in BGP?

    • Use ORIGIN attribute to record route origin
    • Use AS_PATH attribute to record all ASs during a route passing from the local area to the destination in a certain order 
    • Use NEXT_HOP attribute to record next hop of the route
    • Use MED attribute to influence export selection of other AS

15. Which BGP attribute is usually used to determine the path along which data flows enter an AS?

    • Router ID
    • Nexthop
    • Local-Preference
    • MED 

16. Which parameters are optional for configuring a BGP peer? (Choose two.)

    • IP address
    • Description 
    • Password 
    • AS-number

17. Assume that a TCP connection works properly, and the peer AS number configured for a BGP router is different from the AS number of its BGP peer. During the establishment of a BGP session, the BGP router exchanges routing information with its peer, and finds that its peer AS number is different from the AS number of the peer. Therefore, the BGP router sends a Notification message to the peer, indicating that the establishment of a BGP session fails. Which message can be identified by the Error Code field in the Notification message?

    • Route-refresh
    • Open 
    • Keepalive
    • Update

18. Which statements about BGP well-known mandatory attributes are true? (Choose three.)

    • Well-known mandatory attributes must be identified by all BGP routers.
    • Well-known mandatory attributes must be transmitted between BGP peers.
    • Well-known mandatory attributes are optional in an Update packet, and can be carried in an Update packet as needed.
    • Well-known mandatory attributes must be carried in an Update packet. 

19. Which statements about BGP route selection rules are true? (Choose three.)

    • BGP first ignores routes with unreachable next hops.
    • A summarized route takes precedence over a non-summarized route.
    • IBGP routes take precedence over EBGP routes.
    • If other conditions of routes are the same, the route with the shortest Cluster_List is preferred. 

20. Which of the following statements are correct regarding intra-area route calculation of OSPF? (Choose two.)

    • Every OSPF router only uses one Router LSA to describe local active link state for one area.
    • Every OSPF uses more than one Router LSA to describe local active link state for one area.
    • One Router LSA only describes one link.
    • One Router LSA describes more than one link.