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Share some CCIE 400-201 exam questions and answers below.
ISP_X has IPv4 only enabled in the MPLS backbone. ISP_X must provide IPv6 services to its customers including IPv6 Internet access. 
Which IPv6 transition mechanism allows ISP_X to provide IPv6 connected by leveraging the existing MPLS IPv4 core network? 
A. 6to4 tunnels 
B. NAT444 
C. 6PE 
D. NAT64 
E. 6RD 
F. DS Lite 
Answer: A

Why are thresholds defined based on baseline documents? 
A. To help identify current network problems and predict future bottlenecks 
B. To reduce polling traffic on the network 
C. To verify that interfaces are in the correct state 
D. To suppress duplicate alarms and for event correlation 
E. To ensure that QoS parameters are defined appropriately 
Answer: A

Which routing table is used by PEs and ASBRs to store all VPN routes that need to be exchanged in an Inter-AS L3VPN option B scenario? 
A. IGP table 
B. VRF routing table 
C. Global routing table 
D. BGP table 
Answer: D

A content provider uses ISP-A and ISP-B for Internet transit service for the purpose of redundancy and load balancing. The content provider has one address range assigned to it. 
Which two techniques achieve the load balancing and redundancy for inbound traffic? (Choose two) 
A. BGP Local-preference attribute 
B. BGP MED attribute 
C. Use ISP-A for outbound traffic and ISP-B for inbound traffic 
D. BGP AS-prepend technique 
E. Address range split into two more specific prefixes, then advertise one specific prefix per ISP 
F. Aggregate all prefixes received from both ISPs into a less-specific prefix 
Answer: D, E

An engineer has just configured IOS-XR with out-of-band MPP. Which are the three results that will occur? (Choose three.) 
A.Management traffic to RP from all non-MPP interfaces is dropped 
B.RP/DRP Ethernet Interfaces are not default out-of-band interfaces. 
C.MPP configuration changes doesn't affect active sessions established before the changes 
D.Interfaces configured for out-of-band MPP are still part of global routing/forwarding 
E.If MPP is disabled and a protocol is activated, all interfaces cannot pass traffic 
F.LPTS will provide rate limiting 
Answer: ACF

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