Passtcert Cisco 400-251 CCIE Security exam sample questions

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Share some CCIE Security 400-251 exam questions and answers below.
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

Which three statements are true regarding Security Group Tags? (Choose three.) 
A. When using the Cisco ISE solution, the Security Group Tag gets defined as a separate authorization result. 
B. When using the Cisco ISE solution, the Security Group Tag gets defined as part of a standard authorization profile. 
C. Security Group Tags are a supported network authorization result using Cisco ACS 5.x. 
D. Security Group Tags are a supported network authorization result for 802.1X, MAC Authentication Bypass, and WebAuth methods of authentication. 
E. A Security Group Tag is a variable length string that is returned as an authorization result. 
Answer: A, C, D

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