Cisco Certificatin 400-251 certification guides

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Share some CCIE Security 400-251 exam questions and answers below.
Which two certificate enrollment methods can be completed without an RA and require no direct connection to a CA by the end entity? (Choose two.) 
A. SCEP 
B. TFTP 
C. manual cut and paste 
D. enrollment profile with direct HTTP 
E. PKCS#12 import/export 
Answer: C, E

Which three statements about Cisco Flexible NetFlow are true? (Choose three.) 
A. The packet information used to create flows is not configurable by the user. 
B. It supports IPv4 and IPv6 packet fields. 
C. It tracks all fields of an IPv4 header as well as sections of the data payload. 
D. It uses two types of flow cache, normal and permanent. 
E. It can be a useful tool in monitoring the network for attacks. 
Answer: B, C, E 

Which three statements are true regarding RFC 5176 (Change of Authorization)? (Choose three.) 
A. It defines a mechanism to allow a RADIUS server to initiate a communication inbound to a NAD. 
B. It defines a wide variety of authorization actions, including "reauthenticate." 
C. It defines the format for a Change of Authorization packet. 
D. It defines a DM. 
E. It specifies that TCP port 3799 be used for transport of Change of Authorization packets. 
Answer: A, C, D

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