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Share some CCIE 400-101 exam questions and answers below.
Which TCP features allows a client to request a specific packet that was lost? 
A. flow control 
B. sliding window 
C. fast recovery 
D. selective acknowledgment 
Answer: D

The OSPF adjacency between two routers cannot be established.What is the root cause of the problem? 
A. Both routers are designated routers. 
B. different area ID 
C. mismatched OSPF network types 
D. authentication error 
E. area type mismatch 
Answer: E

Which statement is true about conditional advertisements? 
A. Conditional advertisements create routes when a predefined condition is met. 
B. Conditional advertisements create routes and withhold them until a predefined condition is met. 
C. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met. 
D. Conditional advertisements create routes when a predefined condition is not met. 
E. Conditional advertisements create routes when a predefined condition is met. 
Answer: C

Which statements are true about trunking? 
A. When removing VLAN 1 from a trunk, management traffic such as CDP is no longer passed in that VLAN. 
B. Cisco switches that run PVST+ do not transmit BPDUs on nonnative VLANs when using a dot 1 q trunk. 
C. DTP is a point-to-point protocol. 
D. DTP only supports autonegotiation on 802.1q and does not support autonegotiation for ISL. 
Answer: C

Drag and drop the MPLS term on the left to the function it performs on the right. 



Answer: 




Refer to the exhibit. 



Which QoS mechanism is in use to prioritize voice traffic? 
A. priority queuing 
B. low-latency queuing 
C. CBWFQ 
D. fair queuing 
E. custom queuing 
Answer: B

Which traffic plane supports the TFTP and FTP protocols? 
A. control plane 
B. management plane 
C. data plane 
D. service plane 
Answer: B

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

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