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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 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 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 

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