Nest 0 Cart
Nest Account
Popular Exams
All Categories...
Nest
Nest 0
Contact
Log In / Sign Up
Copyright 2024 © store. All rights reserved.
Home Cisco® 642-887

Cisco® 642-887 Exam Practice Questions (P. 4)

  • Full Access (183 questions)
  • Six months of Premium Access
  • Access to one million comments
  • Seamless ChatGPT Integration
  • Ability to download PDF files
  • Anki Flashcard files for revision
  • No Captcha & No AdSense
  • Advanced Exam Configuration
Get Contributor Access
Question #16
Within the service provider core network, which two QoS mechanisms are typically deployed on the P routers? (Choose two.)
  1. A
    LLQ
  2. B
    traffic policing and remarking
  3. C
    WRED
  4. D
    traffic shaping
  5. E
    traffic classification and markings
  6. F
    link fragmentation and interleaving

Correct Answer:
AC

Question #17
Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)
  1. A
    Apply a QPPB route policy to the BGP process using the table-policy command
  2. B
    Apply a QPPB route policy to the BGP neighbor using the route-policy command
  3. C
    Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group
  4. D
    Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set the BGP community
  5. E
    Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qos-group destination|source command
  6. F
    Enable QPPB on an interface using the ipv4 bgp policy propagation output ip-precedence|qos-group destination|source command

Correct Answer:
ACE
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 system paths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of source address.

Question #18
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?
  1. A
    allows for packets to be classified based on the ToS byte values before packet encryption
  2. B
    allows for packets to be classified based on the ToS byte values after packet encryption
  3. C
    allows for packets to be classified based on the packet payload before packet encryption
  4. D
    allows for packets to be classified based on the packet payload after packet encryption
  5. E
    allows for packets to be classified based on the packet header parameters other than the ToS byte values after packet encryption

Correct Answer:
A
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

Question #19
Which are typical class-based marking policies that are implemented on service provider IP NGN PE routers?
  1. 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.
  2. 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.
  3. 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.
  4. 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.

Correct Answer:
A

Question #20
Which item is not available to be used for QoS classification in Cisco IOS XR?
  1. A
    MAC SA
  2. B
    protocol
  3. C
    inner EXP
  4. D
    discard-class
  5. E
    QoS-group
  6. F
    VLAN

Correct Answer:
C

Previous Questions Next Questions

All Pages