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Share some CCIE Security 400-251 exam questions and answers below.
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 about the Cisco IPS sensor are true? (Choose three.) 
A. You cannot pair a VLAN with itself. 
B. For a given sensing interface, an interface used in a VLAN pair can be a member of another inline interface pair. 
C. For a given sensing interface, a VLAN can be a member of only one inline VLAN pair, however, a given VLAN can be a member of an inline VLAN pair on more than one sensing interface. 
D. The order in which you specify the VLANs in a inline pair is significant. 
E. A sensing interface in inline VLAN pair mode can have from 1 to 255 inline VLAN pairs. 
Answer: A, 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 

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