Share some CCIE 400-201 exam questions and answers below.
What is one of the functions of a LISP ingress tunnel router?
A. Ability to integrity-check LISP site registration messages using a SHA2-based HMAC algorithm
B. Responsible for finding EID-to-RLOC mappings for all traffic destined for LISP-capable sites
C. Accept encapsulation Map-request messages, decapsulate them to the MS responsible for the ETR authoritative for the requested EIDs
D. Allows EIDs and RLOCs to communicate in a LISP site that contains EIDs in one address family and RLOCs in a different address family
Answer: B
A service provider NOC engineer received numerous support tickets from their VPN customer. This customer are reporting packet loss between two PE routers. The NOC engineer created a VRF TEMP to run test between these two PE router and no error were reported. ECMP links are used between P and PE routers.
Which test can quickly identify the core link that is causing the problem?
A. an MPLS traceroute with multipath option between the PE`s loopback
B. an extended traceroute with multipath option between PE`s loopback
C. a VRF traceroute between customers1s CE router and service provider remote PE router
D. a VRF ping between customer`s CE router and service provider remote PE router
E. an extended ping with sweep option between the PE`s Loopbacks
F. an MPLS ping with sweep option between the PE`s Loopbacks
Answer: A
An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enable.
Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconverges?
A. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed
B. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP
C. IP packets are forwarded as soon as routes are learned over a new IGP adjancey before the label exchange happens over the new links
D. LDP is a Layer 2 protocol forwarding Label packets before the IGP reconverged
Answer: C
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
Which two statements about 10 Gigabit Ethernet WAN PHY mode are true? (Choose two.)
A.The signal maps to an OC-192c/STM-64c payload.
B.The nominal speed is 9.95328 Gbps.
C.It is compatible with Packet Ethernet over SONET.
D.The signal maps to an OC-768c/STM-256c payload.
E.It is compatible with Packet over SONET.
F.The nominal speed is 10.3125 Gbps.
Answer: AB
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