Question
Table of Contents
Which of the following statements are TRUE regarding the remarking of packets arriving on the network interface whose ToS-marking-state is set to trusted and remarking enabled on network egress? (Choose two)
A. Native IP Packets will not be remarked.
B. Native IP Packets will be remarked.
C. Packets associated with a VPRN service on an upstream node will not be remarked.
D. Packets associated with an ES service on an upstream node will be remarked.
Answer
B. Native IP Packets will be remarked.
D. Packets associated with an ES service on an upstream node will be remarked
Explanation
The correct answers are B and D.
- Native IP Packets will be remarked. This is because the ToS-marking-state is set to trusted, which means that the router will trust the ToS value that is set in the packet.
- Packets associated with an ES service on an upstream node will be remarked. This is because ES services are configured to use QoS, and the router will remark packets associated with these services to ensure that they receive the desired QoS treatment.
The following statements are FALSE:
- Native IP Packets will not be remarked. This is because the ToS-marking-state is set to trusted, which means that the router will trust the ToS value that is set in the packet.
- Packets associated with a VPRN service on an upstream node will not be remarked. This is because VPRN services are not configured to use QoS, and the router will not remark packets associated with these services.
Here is a more detailed explanation of how remarking works:
When a packet arrives at a router, the router looks at the ToS value that is set in the packet. If the ToS-marking-state is set to trusted, the router will trust the ToS value that is set in the packet. If the ToS-marking-state is set to untrusted, the router will not trust the ToS value that is set in the packet and will instead use the configured QoS policy to determine how to treat the packet.
If the ToS-marking-state is set to trusted and remarking is enabled on network egress, the router will remark the packet to a new ToS value. The new ToS value will be determined by the configured QoS policy.
QoS policies can be configured to mark packets based on a variety of criteria, such as the source or destination IP address, the port number, or the type of traffic.
Remarking can be used to improve the performance of certain types of traffic, such as voice or video traffic. It can also be used to ensure that all traffic is treated fairly, regardless of its source or destination.
Reference
- QoS: Classification Configuration Guide – Marking Network Traffic [Cisco ASR 1000 Series Aggregation Services Routers] – Cisco
- QoS Classification and Marking on Catalyst 6500/6000 Series Switches Running CatOS Software – Cisco
- Alcatel-Lucent Documentation Library (nokia.com)
- QoS Policies (nokia.com)
- QoS Architecture and Basic Operation (nokia.com)
Alcatel-Lucent Quality of Service 4A0-107 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Alcatel-Lucent Quality of Service 4A0-107 exam and earn Alcatel-Lucent Quality of Service 4A0-107 certification.
Alex Lim
Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook
