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Q391. Refer to the exhibit.
Which two statements are true about the displayed STP state? (Choose two.)
A. The STP version configured on the switch is IEEE 802.1w.
B. Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.
C. The switch does not have PortFast configured on Gi0/15.
D. BPDUs with the TCN bit set are transmitted over port channel 1.
Answer: C,D
Explanation:
A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled.
TCN’s are sent using BPDU’s over the root port, which we see is port channel 1.
Q392. In which 802.1D port state are the root bridge, the root port, and the designated port(s) elected?
A. Listening
B. learning
C. forwarding
D. blocking
E. disabled
Answer: A
Explanation:
STP switch port states:
. Blocking – A port that would cause a switching loop if it were active. No user data is sent or received over a blocking port, but it may go into forwarding mode if the other links in use fail and the spanning tree algorithm determines the port may transition to the forwarding state. BPDU data is still received in blocking state. Prevents the use of looped paths.
. Listening – The switch processes BPDUs and awaits possible new information that would cause it to return to the blocking state. It does not populate the MAC address table and it does not forward frames. In this state the root bridge, the root port, and the designated port(s) are elected.
. Learning – While the port does not yet forward frames it does learn source addresses from frames received and adds them to the filtering database (switching database). It populates the MAC Address table, but does not forward frames.
. Forwarding – A port receiving and sending data, normal operation. STP still monitors incoming BPDUs that would indicate it should return to the blocking state to prevent a loop.
. Disabled – Not strictly part of STP, a network administrator can manually disable a port.
Reference: http://en.wikipedia.org/wiki/Spanning_Tree_Protocol
Q393. DRAG DROP
Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right.
Answer:
Q394. Which two statements about OSPF route types are true? (Choose two.)
A. The cost of an external type 2 route is the sum of the external and internal costs.
B. The cost of an external type 2 route is the same as the external cost.
C. Intra-area routes originate outside of their area.
D. Inter-area routes originate inside their area.
E. The cost of an external type 1 route is the same as the internal cost.
F. For routes to the same destination, external type 1 routes are preferred over external type 2 routes.
Answer: B,F
Explanation:
External routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. A type 1 route is always preferred over a type 2 route for the same destination.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html
Q395. Which component of MPLS architecture uses protocols such as the label distribution protocol and tag distribution protocol to exchange labels?
A. control plane
B. data plane
C. forwarding plane
D. routing plane
Answer: A
Q396. Refer to the exhibit.
You are configuring the S1 switch for the switch port that connects to the client computer. Which configuration blocks users on the port from using more than 6 Mbps of traffic and marks the traffic for a class of service of 1?
A)
B)
C)
D)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
Answer: A
Explanation:
Only option A specified that the exceed and violate actions are set to drop for traffic over the CIR of 6 Mbps, and is also configured to set all traffic with a COS of 1 using the “set cos1” command.
Q397. DRAG DROP
Drag and drop each GET VPN feature on the left to the corresponding function it performs on the right.
Answer:
Q398. Refer to the exhibit.
Which option is the most likely explanation of the duplicate address message logged?
A. HSRP misconfiguration
B. a PC with IP of 10.10.1.1
C. spanning-tree-loop
D. a hardware problem
Answer: A
Q399. Which CoS value is mapped to DSCP 48 by default?
A. 6
B. 7
C. AF21
D. AF44
E. AF41
F. 46
Answer: A
Q400. Which three options are three benefits of an MPLS VPN? (Choose three.)
A. It allows IP address space overlap by maintaining customer routes in a private routing table.
B. It offers additional security by preventing intrusions directly into the customer routing table.
C. It offers a transparent virtual network in which all customer sites appear on one LAN.
D. It offers additional security by allowing only dynamic routing protocols between CE and PE routers.
E. It allows IP address space overlap by maintaining customer routes in the global routing table with unique BGP communities.
F. Providers can send only a default route for Internet access into the customer VPN.
Answer: A,B,C