H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 13

H12-224 : HCNP-R&S Fast Track (Huawei Certified Network Professional – Routing & Switching Fast Track) : Part 13

1. Which of the following are disadvantages of the traditional tail drop mechanism? (Choose three.)

   • TCP global synchronization 
   • TCP starvation 
   • High Average Link Utilization
   • Packet drop is not based on priorities 

2. QoS can provide different quality of service according to different demands, which of the following are functions of QoS? (Choose three.)

   • Providing private bandwidth for users 
   • Reducing cost of the network
   • Congestion management and avoidance 
   • Specifying priority of packets 

3. Which of the following statements about the VRRP authentication is false?

   • VRRP provides no authentication.
   • VRRP provides the simple text authentication.
   • VRRP provides the MD5 authentication.
   • VRRP provides the RSA key authentication. 

4. Which of the following statements about the mVRRP backup group is false?

   

   • Multiple service VRRP backup group can be bound to one mVRRP backup group.
   • An mVRRP backup group can serve as a service VRRP backup group and thus be bound to another mVRRP backup group. 
   • One service VRRP backup group can be bound to only one mVRRP backup group.
   • After multiple service VRRP backup groups are bound to an mVRRP backup group, the mVRRP backup group determines the status of all the service VRRP backup groups by sending VRRP packets. This can reduce the number of VRRP packets to be sent and improve the packet processing efficiency.

5. Which of the following information in a packet can be marked or re-marked?

   • IP DSCP, IP precedence, and 802.1p information 
   • IP source and destination addresses
   • MAC address
   • Any information in the packet

6. Congestion occurs when a link or node is carrying so much data that its quality of service deteriorates.

   • True 
   • False

7. If the Open message sent from a BGP speaker has the GR capability field but no <AFI, SAFI> field, the BGP speaker has no backup forwarding table. Such a BGP speaker functions as only the GR helper to help its neighbors complete the GR process.

   • True 
   • False

8. The NSF function takes effect only after the GR function is enabled on two directly connected routers that use static routes for communication between users in different network segments.

   • True
   • False 

9. None Stop Forwarding (NSF) is an important high availability (HA) technology. It ensures the normal data forwarding even in the case of a fault in the control plane of the router, protecting key services on the network from interruption.

   • True 
   • False

10. Ethernet0/0 of RTA and Ethernet0/0 of RTB connect to the same LAN, both are enabled with VRRP. Create a virtual router with ID 1 and virtual IP address 10.1.1.254. Which of the following commands can make RTB Master without modifying the priority of RTA?

    • [RTB-Ethernet0/0]vrrpvrid 1 priority 200 
    • [RTB-Ethernet0/0]vrrpvrid 1 virtual-ip 10.1.1.254 priority 200
    • [RTB-Ethernet0/0]vrrpvrid 1 force-master
    • [RTB]vrrpvrid 1 force-master

11. A VRRP backup group is able to track the status of an interface. If the interface configured with a VRRP backup group fails or any interface on the router fails, the VRRP backup group provides a backup for the faulty interface.

    • True 
    • False

12. What is the legal virtual MAC address in VRRP?

    • 01-01-5E-00-01-01
    • 01-00-5E-00-01-00
    • 00-00-5E-00-01-01 
    • 01-01-5E-00-00-01

13. Simple traffic classification can be performed based on which of the following information in IPv4 packets? (Choose two.)

    • DSCP 
    • IP precedence 
    • EXP
    • 802.1p

14. Which of the following statements about a backup router in a VRRP backup group are true? (Choose three.)

    • It receives VRRP packets from the master router and determines whether the master router is functioning properly. 
    • It responds to the ARP requests sent from a virtual IP address.
    • It discards an IP packet whose destination MAC address is a virtual MAC address. 
    • It discards an IP packet whose destination IP address is a virtual IP address. 

15. The formula for calculating the MTTR is: MTTR = Fault detection time + Board replacement time + System initialization time + Link recovery time + Route convergence time + Forwarding recovery time. The smaller the addends are, the smaller the MTTR is and the higher the device availability is.

    • True 
    • False

16. Which of the following is not the BFD fault detection mode?

    • Asynchronous mode
    • Demand mode
    • Echo mode
    • Peer mode 

17. Which of the following statements about the mVRRP backup group are true? (Choose three.)

    

    • An mVRRP backup group can be bound to other service VRRP backup groups. 
    • An mVRRP backup group cannot be bound to multiple service VRRP backup groups but can function as a service VRRP group to be bound to another mVRRP group.
    • After a VRRP backup group member is bound to an mVRRP backup group, the state machine of the VRRP backup group member becomes dependent. That is, the VRRP backup group member deletes the protocol timer, and no longer sends or receives packets, and implements its state machine by directly copying the status of the mVRRP backup group. 
    • A VRRP backup group member can be bound to only one mVRRP backup group. 

18. Which of the following congestion avoidance mechanisms can be used to avoid global TCP synchronization? (Choose two.)

    • RED 
    • WRED 
    • FIFO
    • WFQ

19. Which of the following statement about the jitter and delay is false?

    • The jitter depends on the delay.
    • The variation in packet delay is called jitter.
    • The lower the delay is, the less the jitter is.
    • The jitter is independent of the delay. 

20. The interface IP address and virtual IP address configured for VRRP must not be identical.

    • True
    • False