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Cisco 642-887 Exam - Cheat-Test.com

Free 642-887 Sample Questions:

Q: 1
On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?
A. LLQ
B. LPTS
C. Committed Access Rate
D. Control Plane Policing
E. Management Plane Protection
F. NetFlow
G. ACL
Answer: B
Explanation:
Local Packet Transport Services (LPTS) maintains tables describing all packet flows destined for the securedomain router (SDR), making sure that packets are delivered to their intended destinations.
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing(CBWFQ).

Q: 2
When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority command on a Cisco ASR9K router, which additional QoS command is required for this traffic class?
A. shape
B. police
C. random-detect
D. bandwidth
Answer: B
Explanation:
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing(CBWFQ).

Q: 3
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 queuingsystem, thus it could not guarantee the delay and jitter (delay variation) requirements of real-time, interactivevoice and video conversations. Since for CBWFQ, the weight
for a packet belonging to a specific class isderived 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. Thisscheme poses problems for voice traffic that is largely intolerant of delay, especially variation in delay

Q: 4
Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)
A. Apply a QPPB route policy to the BGP process using the table-policy command
B. Apply a QPPB route policy to the BGP neighbor using the route-policy command
C. Define a QPPB route policy to match the customer routes, then set the IP precedence or qosgroup
D. Define a QPPB route policy to match the customer IP precedence or qos-group markings,then set the BGP community
E. Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qosgroup destination|source command
F. Enable QPPB on an interface using the ipv4 bgp policy propagation output ip-precedence|qosgroup destination|source command
Answer: A,C,E
Explanation:
QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of service (QoS)policy and classification by the sending party based on access lists, community lists and autonomous systempaths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of sourceaddress.

Q: 5
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: E

Q: 6
Which are typical class-based marking policies that are implemented on service provider IP NGN PE routers?
A. On the PE ingress, classify the customer traffic and then mark with qos-group. On the PE egress, classify based on the qos-group and then mark with mpls exp.
B. On the PE ingress, classify the customer traffic and then mark with mpls exp. On the PE egress, classify based on the mpls exp and then mark with qos-group.
C. On the PE ingress, trust the customer QoS markings. On the PE egress, classify based on the customer QoS markings and then mark with qos-group.
D. On the PE ingress, trust the customer QoS markings. On the PE egress, classify based on the customer QoS markings and then mark with mpls exp.
Answer: A


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