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Question 1:

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

Correct Answer: C

Question 2:

Which technology is a forwarding decision point in a PE router that provides flexibility to make many Layer 2 flow decisions within an interface?

A. pseudowire



D. local connect


Correct Answer: E

Question 3:

Which three OSPF pieces of information must between routers in order to establish an ospf neighborship? (Choose three)

A. Area ID

B. Hello interval and dead interval timer value

C. LSA refresh period timer value

D. Priority value

E. Stub flag

F. Process ID

Correct Answer: ABE

Question 4:

Refer to the exhibit PIM sparse mode is implemented in the network RPF succeeds under which condition?

A. The RPF check succeeds for the highest DR priority for the PIM router

B. The RPF check succeeds for both PIM neighbors, and traffic load-balances across both neighbors

C. The RPF check succeeds for the next hop whose router ID is the highest

D. The RPF check succeeds for the highest interface IP address for the PIM router

Correct Answer: D

Question 5:

Refer to the exhibit the prefix is flapping when PE1 is flapping. Which action can fox this issue?

A. On PE2, allow only redistribution from BGP into IS-IS on PE3, allow only redistribution from IS-IS into BGP

B. On PE2 and PE3 reconfigure redistribute BGP into IS-IS using the metric-type external parameter

C. configure a sham link between PE2 and PE3

D. configure all IS-IS instances as level-1-only

Correct Answer: A

Latest 400-201 Dumps400-201 VCE Dumps400-201 Practice Test

Question 6:

Which three IS-IS TLVs floods the MPLS TE resource allocation information through the network?

(Choose three)

A. Traffic engineering router ID

B. Extended IP reachability

C. IS TE reachability


E. Extended IS reachability

F. Opaque

Correct Answer: ABE

Question 7:

In multicast Inter-AS VPN context, which BGP attribute should you use to overcome the Option B limitation due to a rewritten originator next-hop address in the network.

A. weight

B. originator

C. connector

D. AS Path

Correct Answer: C

Question 8:

A service provider engineer enabled the BGP next-hop tracking feature and also tuned the OSPF to increase the network convergence in case of network failures. However , the operator engineer notices that in cases of PE failure, the network convergence is still slow. which configuration must the operator use to remedy this failure scenario?

A. router bgp 65000 address-family ipv4 bgp nexthop trigger delay 1 ! address-family vpnv4 bgp nexthop trigger delay 1

B. ip prefix-list PREFIX_32 permit ge 32 ! route-map ONLY_32 permit 10 match ip address prefix-list PREFIX_32 match source-protocol ospf ! router bgp 65000 address-family vpnv4 bgp next-hop route-map ONLY_32

C. router ospf 1 default-information originate always metric-type 1 timers throttle Isa 1 5 5000 timers throttle spf 1 5 5000

D. router ospf 1 no default-information originate tiers throttle Isa all 1 5 5000 times throttle spf 1 5 5000

E. router bgp 65000 address-family ipv4 no bgp next-hop trigger enable bgp additional-paths install ! address-family vpnv4 no bgp next-hop trigger enable bgp additional-paths install

Correct Answer: A

Question 9:

Which mechanism protects the control and management planes of a cisco IOS device to maintain routing stability, network reachability, and packet delivery?


B. BGP Flow Spec



E. NetFlow

Correct Answer: D

Question 10:

In PPPoA architecture, which two methods are most commonly deployed? (Choose two)

A. Terminating PPP sessions at the service provider

B. L2TP tunnelling

C. GRE tunnelling

D. PPP multiplexing

E. PPP framing

Correct Answer: AB

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