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Q181. What is the function of an implicit-null label?
A. It notifies the upstream LSR to remove the top label in the label stack and forward the packet.
B. It notifies the upstream LSR to add a VPN label to the label stack.
C. It is used to statically assign a label to an IGP route.
D. It is used to identify the router ID.
Answer: A
Q182. Refer to the exhibit.
What will be the extended community value of this route?
A. RT:200:3000 RT:200:9999
B. RT:200:9999 RT:200:3000
C. RT:200:3000
D. RT:200:9999
Answer: D
Explanation:
Here the route map is being used to manually set the extended community RT to 200:9999
Q183. When you implement CoPP on your network, what is its default action?
A. permit all traffic
B. rate-limit bidirectional traffic to the control plane
C. drop management ingress traffic to the control plane
D. monitor ingress and egress traffic to the control plane by using access groups that are applied to the interface
E. block all traffic
Answer: A
Q184. Which two statements about a network running MPLS VPN with IS-IS IGP are true? (Choose two.)
A. IS-IS traffic engineering uses wide metric TLV type 135 with an up/down bit to define a leaked route.
B. IS-IS traffic engineering uses wide metric TLV type 128 with an internal/external bit and an up/down bit to define a leaked route.
C. IS-IS traffic engineering uses wide metric TLV type 130 with an internal/external bit and an up/down bit to define a leaked route.
D. If the IS-IS up/down bit is set to 1, the leaked route originated in the L1 area.
E. The MPLS VPN IS-IS core is inherently protected against IP-based attacks.
Answer: A,E
Q185. In the DiffServ model, which class represents the lowest priority with the lowest drop probability?
A. AF11
B. AF13
C. AF41
D. AF43
Answer: A
Explanation:
Assured Forwarding (AF) Behavior Group
Class 1
Class 2
Class 3
Class 4
Low Drop
AF11 (DSCP 10)
AF21 (DSCP 18)
AF31 (DSCP 26)
AF41 (DSCP 34)
Med Drop
AF12 (DSCP 12)
AF22 (DSCP 20)
AF32 (DSCP 28)
AF42 (DSCP 36)
High Drop
AF13 (DSCP 14)
AF23 (DSCP 22)
AF33 (DSCP 30)
AF43 (DSCP 38)
Reference: http://en.wikipedia.org/wiki/Differentiated_services
Q186. Refer to the exhibit.
Which two commands are required on R3 in order for MPLS to function? (Choose two.)
A. mpls ip
B. ip cef
C. mpls label protocol tdp
D. mpls ip propagate-ttl
Answer: A,B
Q187. Which TCP feature 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
Explanation:
. TCP Selective Acknowledgment
The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data. Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP sender could learn about only one lost packet per-round-trip time. An aggressive sender could choose to resend packets early, but such re-sent segments might have already been successfully received. The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host returns selective acknowledgment packets to the sender, informing the sender of data that has been received. In other words, the receiver can acknowledge packets received out of order. The sender can then resend only missing data segments (instead of everything since the first missing packet). Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would receive acknowledgment of only packets 1, 2, and 3. Packets 4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be re-sent. TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. There is no performance impact when the feature is enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP selective acknowledgment.
Refer to RFC 2021 for more details about TCP selective acknowledgment.
Q188. Which two best practices does Cisco recommend to migrate a network from PVST+ to MST? (Choose two.)
A. Start the migration at the edge nodes and work toward the root bridge.
B. Before starting the transition, configure one of the edge nodes with a lower priority so that it becomes the root bridge after the transition.
C. Before starting the transition, ensure that at least two nodes act as the root bridge for all VLANs in the network.
D. Start the migration at the root bridge and work toward the edge nodes.
E. Before starting the transition, configure one of the edge nodes with a higher priority so that it becomes the root bridge after the transition.
F. Before starting the transition, ensure that one node is the root bridge for all VLANs in the network.
Answer: A,F
Q189. Which cache aggregation scheme is supported by NetFlow ToS-based router aggregation?
A. prefix-port
B. AS
C. protocol port
D. destination prefix
Answer: A
Q190. Refer to the exhibit.
Routers R1 and R2 are configured as shown, and traffic from R1 fails to reach host 209.165.201.254.
Which action can you take to correct the problem?
A. Ensure that R2 has a default route in its routing table.
B. Change the OSPF area type on R1 and R2.
C. Edit the router configurations so that address 209.165.201.254 is a routable address.
D. Remove the default-information originate command from the OSPF configuration of R2.
Answer: A
Explanation:
Not sure that any of these answers are correct, it appears that this configuration is valid for reaching that one specific host IP. Answer A does have a route to that host so it would not need a default route to get to it. Choice B is incorrect as the area types have nothing to do with this. C is incorrect as that IP address is routable, and D is needed so that R1 will have a default route advertised to it from R2 so that it can reach this destination.
