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Share some CCIE 400-101 exam questions and answers below.
Which two statements about AAA authentication are true? (Choose two) 
A. RADIUS authentication queries the router's local username database. 
B. TACASCS+ authentication uses an RSA server to authenticate users. 
C. Local user names are case-insensitive. 
D. Local authentication is maintained on the router. 
E. KRB5 authentication disables user access when an incorrect password is entered. 
Answer: DE

What are two mechanisms that directed ARP uses to help resolve IP addresses to hardware addresses? (Choose two) 
A. It removes address-resolution restrictions, allowing dynamic protocols to advertise rou information for the device loopback address. 
B. It uses ICMP redirects to advertise next-hop addresses to foreign hosts. 
C. It uses series of ICMP echo messages to relay next-hop addresses. 
D. It removes address-resolution restrictions, allowing dynamic protocols to advertise routing information for the next-hop address. 
E. It uses a proxy mechanism to allow a device to respond to ARP requests for the addresses of other devices. 
Answer: BD

Which three service offer VLAN transparency for WAN Ethernet services? (Choose three) 
A. ERMS 
B. EPL 
C. ERS 
D. MPLS 
E. EMS 
F. EWS 
Answer: BEF

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