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Share some HCNP-R&S H12-223 exam questions and answers below.
Which of the following is correct about the feasibility assessment of equipment software upgrades? 
A. In order to ensure the stable operation of network devices, it is recommended to upgrade the device software in time. 
B. If major or more complicated upgrade operations are carried out, it should be debugged in the simulation environment in advance, and the upgrade plan and emergency plan test should be completed. 
C. Upgrades usually only result in very short business interruptions, so there is no need to confirm with the user, which increases efficiency 
D. The software upgrade of the device usually does not pose a threat to the stable operation of the network, so risk assessment and risk avoidance are usually not required before the upgrade. 
Answer: B

Which of the following statements are correct about the DHCP Server denial of service attack? (Multiple Choice) 
A. DHCP denial of service attack consumes address pool resources by controlling a large number of terminals to simultaneously send address request messages. 
B. DHCP denial of service attack consumes address resources by continuously modifying the CHADDR field in the DHCP request message. 
C. The DHCP denial of service attack will quickly exhaust the IP address resources in the DHCP address pool. 
D. After the DHCP server address resource is exhausted, it will no longer process and respond to DHCP request messages. 
Answer: BCD

GRE is a general routing encapsulation protocol that can carry routing protocols and provide an encryption verification mechanism. 
A. True 
B. False 
Answer: B

What are the factors that cause traffic interruption after a network failure? (Multiple Choice) 
A. Fault detection time 
B. Routing loop 
C. Fault propagation time 
D. Single device fault response time (entry update) 
Answer: ABCD

What preparations do you need to make before a large-scale network change? (Multiple Choice) 
A. Submit a formal network change request 
B. Backup preparation, including policy backup, link backup, device backup, power backup 
C. Conduct network research, develop a cutover plan and review 
D. Staffing arrangements 
Answer: ABCD


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