CCIE Routing and Switching Written Exam 400-101 available exam questions Certpark

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Share some CCIE 400-101 exam questions and answers below.
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 two statements about TCP MSS are true? (Choose two) 
A. It operates at Layer 3. 
B. It sets the maximum amount of data that a host sends in an individual datagram. 
C. It sets the minimum amount of data that a host accepts in an individual datagram. 
D. The two endpoints in a TCP connection report their MSS values to one another. 
E. MSS values are sent in TCP SYN packets. 
Answer: D, E

For which reason can two OSPF neighbor routers on the same LAN segment be stuck in the two-way state? 
A. The two routers have different MTUs on the interface. 
B. The two routers are configured with different priorities. 
C. The interface priority is set to zero on both routers. 
D. Both routers have the same OSPF router ID. 
Answer: C

How does MSTP maintain compatibility with RSTP? 
A. MSTP sends all spanning-tree information in one BPDU. 
B. MSTP supports five port states in the same way as RSTP. 
C. RSTP implements a TTL that is compatible with the MSTP max age timer. 
D. RSTP encodes region information from an MSTP BPDU into a single instance. 
Answer: A

Refer to the Exhibit. 



Which kind of ICMPv6 packet is shown in the output? 
A. neighbor advertisement 
B. neighbor solicitation 
C. router discovery 
D. time exceeded 
E. router advertisement 
Answer: B

Which utility can you use to identify the cause of a traffic -flow blockage between two devices in a network? 
A. iWan application 
B. ACL analysis tool in APIC-EM 
C. ACL path analysis tool in APIC-EM 
D. APIC-EM automation scheduler 
Answer: C

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