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Share some HCNP-R&S H12-221 exam questions and answers below.
Which of the following are the type of secure MAC address in port security technology? (Multiple Choice) 
A. Secure dynamic MAC address 
B. Secure static MAC address 
C. Protect MAC address 
D. Sticky MAC address 
Answer: ABD

MUX VLAN can reduce enterprise VLAN ID consumption. 
A. TRUE 
B. FALSE 
Answer: B

The BGP protocol has a type of message periodically sent between BGP neighbors to maintain the connection relationship. What is the message? 
A. Hello 
B. Open 
C. Keepalive 
D. Update 
Answer: C

Which of the following tools cannot be directly referenced by the route-policy apply clause? 
A. tag 
B. community 
C. origin 
D. IP-Prefix 
Answer: D

In the format of configuring BPDU packets, in addition to ensuring that the STF format is basically the same, RSTP made some minor changes. Which description is correct? (Multiple Choice). 
A. In the flag field, Bit0 is TCA 
B. Type field, the configuration BPDU type is no longer 0 but 2 
C. The device running STP will discard when it receives the configuration BPDU of RSTP. 
D. The flags field uses the middle 6 bits that were originally reserved. The changed configuration BPDU is called RST BPDU. 
Answer: BCD

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