NEW QUESTION 1
Which option is the appropriate method for CBWFQ WRED implementation in Cisco IOS XR?

• A. configurepolicy-map POLICY_1 class CLASS1 random-detect default commit
• B. configurepolicy-map POLICY_1 class CLASS1wred default commit
• C. configure interface pos 0/0/0/0random-detect default commit
• D. configurepolicy-map POLICY_1 class CLASS1weighted random-detect default commit

Answer: A

NEW QUESTION 2
Within the service provider core network, which two QoS mechanisms are typically deployed on the P routers? (Choose two.)

• A. LLQ
• B. traffic policing and remarking
• C. WRED
• D. traffic shaping
• E. traffic classification and markings
• F. link fragmentation and interleaving

Answer: AC

NEW QUESTION 3
Given this configuration of an interface for MPLS traffic engineering on a Cisco IOS XE router:
interface POS1/1/0 mpls traffic-eng tunnels ip rsvp bandwidth 5000
Which option lists the equivalent configurations required on a Cisco IOS XR router?

• A. interface POS1/1/0 mpls traffic-eng tunnels ip rsvp bandwidth 5000
• B. mpls traffic-eng interface POS1/1/0
• C. mpls traffic-eng interface POS1/1/1 bandwidth 5mb
• D. mpls traffic-eng interface POS1/1/0 rsvpinterface POS1/1/0
• E. mpls traffic-eng interface POS1/1/0 rsvpinterface POS1/1/0 bandwidth 5000

Answer: E

NEW QUESTION 4
Referring to the Cisco IOS XR show command output exhibit,

what are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

• A. GigabitEthernet0/1/0/10 is not configured to run LDP.
• B. Graceful restart is not configured on the peer.
• C. The LDP neighbor on GigabitEthernet0/1/0/10 is not up.
• D. The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.
• E. LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.
• F. GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.

Answer: CDE

NEW QUESTION 5
On Cisco routers, how is hierarchical QoS implemented?

• A. Within the parent policy, reference another child policy using the policy-map command.
• B. Within the child policy, reference another parent policy using the policy-map command.
• C. Use the policy-map command within a service-policy to implement nested policy-maps.
• D. Within the parent policy-map, reference another child policy-map using the service- policy command.

Answer: D

NEW QUESTION 6
Which Cisco IOS XR command should be used to identify if MPLS TE FRR is enabled?

• A. show mpls traffic-eng tunnel <tunnel#>
• B. show mpls frr
• C. show mpls traffic-eng protection
• D. show mpls protection
• E. show mpls fast-reroute

Answer: A

Explanation:
The MPLS Traffic Engineering (TE)—Fast Reroute (FRR) Link and Node Protection feature provides link protection (backup tunnels that bypass only a single link of the label-switched path (LSP)), node protection (backup tunnels that bypass next-hop nodes along LSPs), and the following FRR features:
•Backup tunnel support
•Backup bandwidth protection
•Resource Reservation Protocol (RSVP) Hellos
Prerequisites for MPLS Traffic Engineering (TE)—Fast Reroute (FRR) Link and Node Protection
Your network must support the following Cisco IOS features:
•IP Cisco Express Forwarding
•Multiprotocol Label Switching (MPLS)
Your network must support at least one of the following protocols:
•Intermediate System-to-Intermediate System (IS-IS)
•Open Shortest Path First (OSPF)
Before configuring FRR link and node protection, it is assumed that you have done the following tasks but you do not have to already have configured MPLS TE tunnels:
•Enabled MPLS TE on all relevant routers and interfaces
•Configured MPLS TE tunnels

NEW QUESTION 7
Which two of the following statements are correct regarding LSPs? (Choose two.)

• A. An LSP is created for every routing protocol entry.
• B. Each LSP is bidirectional, that is, packets traveling in the opposite direction use the same LSP.
• C. An IGP is used to populate routing tables in all routers in an MPLS domain.
• D. LDP is used to propagate labels and build LSPs.
• E. The FIB is used to forward MPLS-labeled packets down an LSP.

Answer: CD

NEW QUESTION 8
Which protocol is used to send MPLS OAM traffic over an MPLS network?

• A. ICMP
• B. IP protocol number 137
• C. TCP
• D. UDP

Answer: D

NEW QUESTION 9
Which method is used to mark traffic matched by class-map MY_CLASS as Expedited Forwarding?

• A. set ip dscp cs7
• B. set dscp cs7
• C. set dscp 46
• D. set dscp 45

Answer: C

NEW QUESTION 10
Refer to the exhibit.

Which result occurs from this configuration?

• A. The tunnel comes up because of the explicit path configuration and disregards all CSPF calculations
• B. If the explicit path becomes unavailable, the tunnel falls back to dynamic routing paths
• C. If the explicit path becomes unavailable, the tunnel fails
• D. The traffic through the tunnel is limited to 65,000 Kbps of bandwidth

Answer: B

NEW QUESTION 11
On the Cisco ASR9K router, when using the bandwidth command to specify the minimum guaranteed bandwidth to be allocated for a specific class of traffic, what will be used as the queuing algorithm?

• A. custom queuing
• B. CBWFQ
• C. WFQ
• D. FIFO
• E. priority queuing

Answer: B

Explanation:
Class based weighted fair queuing (CB-WFQ) was initially released without the support of a priority queuing system, thus it could not guarantee the delay and jitter (delay variation) requirements of real-time, interactive voice and video conversations. Since for CBWFQ, the weight for a packet belonging to a specific class is derived from the bandwidth assigned to the class, which in turn determines the order in which packets are sent.
All packets are serviced fairly based on weight and no class of packets may be granted strict priority. This scheme poses problems for voice traffic that is largely intolerant of delay, especially variation in delay

NEW QUESTION 12
Which two protocols facilitate label bindings by neighboring routers? (Choose two.)

• A. IS-IS
• B. LDP
• C. OSPF
• D. EIGRP
• E. BGP

Answer: BE

NEW QUESTION 13
Which option is a Cisco-recommended congestion management or queuing method for real-time traffic for voice and video?

• A. CB-WFQ
• B. PQ
• C. WFQ
• D. LLQ

Answer: D

NEW QUESTION 14
A recent analysis of a service provider network infrastructure revealed the necessity to reinforce bandwidth control over all the 5 Mbps residential customer contracts. Which option is a viable solution to rate limit customer’s bandwidth both upstream and downstream?

• A. class-based policing
• B. committed access rate on a per interface basis
• C. reserving 5 Mbps on Cisco MPLS TE tunnels that connect customers
• D. setting customer Ethernet links to 10 Mbps half-duplex

Answer: C

NEW QUESTION 15
Refer to the exhibit.

This WRED policy configuration is implemented on an IOS XR router. What is the measurement of the numbers in the random-detect precedence command?

• A. bytes
• B. number of packets
• C. kilobytes
• D. milliseconds

Answer: B

NEW QUESTION 16
Scenario:




On the PE8-router what is the label value used to reach the 10.7.1.1/32 network prefix?

• A. 10.0.2.1:0
• B. imp-null
• C. 16024
• D. 128

Answer: C

Explanation:
Issue on PE8: show mpls forwarding-table
Look for the "Outgoing Label" not the "Local Label" for the prefix 10.7.1.1/32. You will notice that the Label value is 16024.

NEW QUESTION 17
An engineer looks at packet captures and sees that the MPLS header field of a packet indicates a bottom of stack field of 0. What can the engineer conclude from this information?

• A. The packet is an AToM packet
• B. One label is on the packet
• C. At least one more MPLS label is on the packet
• D. No labels are on the packet

Answer: C

NEW QUESTION 18
When defining an explicit MPLS TE tunnel path, which two command options are available under the explicit-path configuration mode? (Choose two.)

• A. exclude-address
• B. include-address
• C. next-address
• D. dynamic-address

Answer: AC

NEW QUESTION 19
How many labels does an MPLS packet have, with a bottom-of-stack label set to zero?

• A. The packet has no label.
• B. The packet has one label.
• C. The packet may have one or more labels.
• D. The packet has at least two labels.

Answer: D

NEW QUESTION 20
What are the four fields inside the MPLS shim header? (Choose four.)

• A. EXP
• B. TTL
• C. Version
• D. S
• E. Length
• F. Label
• G. Type
• H. FCS

Answer: ABDF

NEW QUESTION 21
The Cisco IOS and IOS XE qos pre-classify command allows which kind of packet classification on IP packets that are encapsulated with GRE and IPsec?

• A. allows for packets to be classified based on the ToS byte values before packet encryption
• B. allows for packets to be classified based on the ToS byte values after packet encryption
• C. allows for packets to be classified based on the packet payload before packet encryption
• D. allows for packets to be classified based on the packet payload after packet encryption
• E. allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

Answer: A

Explanation:
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a008017405e. shtml
The qos pre-classify command
When packets are encapsulated by tunnel or encryption headers, QoS features are unable to examine the original packet headers and correctly classify the packets. Packets traveling across the same tunnel have the same tunnel headers, so the packets are treated identically if the physical interface is congested. With the introduction of the Quality of Service for Virtual Private Networks (VPNs) feature, packets can now be classified before tunneling and encryption occur.
In this example, tunnel0 is the tunnel name. The qos pre-classify command enables the QoS for VPNs feature on tunnel0:
Router(config)# interface tunnel0
Router(config-if)# qos pre-classify

NEW QUESTION 22
Which feature should you configure to enable routers to maintain MPLS label information despite link flaps on an interface?

• A. Targeted Adjacency
• B. IGP Synchronization
• C. MPLS LDP Session Protection
• D. NSR

Answer: C

NEW QUESTION 23
Scenario:




After reviewing present router configuration CE7 .which two statements are correct regarding behavior of the "IIq" policy-map? (Choose 2)

• A. Traffic matched by the "cisco1" class-map will be assigned to the priority queue.
• B. The "IIq" QoS policy is applied to the gi0/0 interface in the output direction
• C. Traffic matched bythe"cisco2" class-map has a maximum bandwidth of 30%
• D. Traffic matched bythe"cisco3" class-map has no priority and has a minimum bandwidth guarantee of 20%
• E. There are no packets being matched by the "class-default" traffic class in the "IIq" policy

Answer: AD

Explanation:
You will notice that "cisco1" class map is assigned to the priority queue (the command is configured under policy-map IIq class cisco1 priority xxx)
"cisco2" class map: is indeed configured using bandwidth 30%, however that defines the minimum bandwidth but not the maximum.
"cisco3" class map: is indeed configured using "bandwidth 20%", No priority configured and that will define the minimum guaranteed bandwidth.
The last choice is wrong! check under "show policy-map interface" There are 4 or more packets being matched by the "class-default" traffic class in the "IIq" policy.
Class-map: class-default (match-any) 4 packets, 968 bytes

NEW QUESTION 24
In Cisco IOS, what must be configured to ensure that an MPLS TE tunnel becomes active?

• A. layer 3 addressing on the tunnel, to establish bidirectional communication over the tunnel
• B. the tunnel for autoroute, to ensure proper installation into the forwarding plane
• C. a path-option configuration, for either dynamic or explicit paths
• D. the tunnel with a minimum bandwidth value, to properly calculate CSPF

Answer: A

NEW QUESTION 25
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