Exam 350-401 topic 1 question 2 discussion

Question is "Alter the packet". so it is packet "Marking"

C is correct Marking is the QoS function that alters bits in a frame, cell, or packet.A frame, cell, or packet can be marked by changing bits in order to tell the network how to handle the traffic. The question is "Alter the packet". so it´s packet "Marking".

The actions that are carried out by the marker include the following: • Passing through the packet without modification • Dropping the packet • Modifying (marking down) the assigned DSCP or CoS value of the packet and allowing the packet to pass through from Bacha D. book CCNP and CCIE Enterprise Core ENCOR 350-401

The QoS component that alters a packet to change the way that traffic is treated in the network is: C. **marking** ### Explanation: - **Marking**: This process modifies certain bits in the packet header (such as the DSCP or IP precedence bits) to indicate the priority level. This alteration ensures that network devices treat the packet according to its assigned priority. Other options like **policing**, **classification**, and **shaping** do not directly alter the packet to change its treatment in the network.

It's C - Marking. Here's my breakdown, feel free to correct me if I'm wrong: Policing & Shaping - how the traffic IS TREATED after being marked Classification - Initial categorization of traffic based on common traits (i.e. Voice, Video, regular data traffic) Marking - Altering some bits in the L2 or L3 header, with the intention of letting other devices’ QoS tools classify traffic based on the marked values.

"C" - marking alters packet to change further treatment "A" - polices packet based its "color"(DSCP/COS etc) "B" - classify packet as belonging to one of the target classes "D" - shapes packet

Answer is A RIB: The RIB is a database that stores all the routing information learned from various sources such as static routes, dynamic routing protocols, or administrative configurations. It contains the full set of routing information available within a router, including multiple possible routes for a destination network. The RIB is typically used to calculate the best path for forwarding packets. FIB: The FIB, on the other hand, is a subset of the RIB. It is a data structure that contains the forwarding table entries used by the router for actual packet forwarding decisions. The FIB is optimized for fast lookup and efficient packet forwarding. It contains only the best routes selected from the RIB based on various metrics like administrative distance, route preference, or path cost.

C is correct

C is correct. Traffic marking allows you to mark (that is, set or change) a value (attribute) for the traffic belonging to a specific class. Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_classn/configuration/xe-16/qos-classn-xe-16-book/qos-classn-mrkg-ntwk-trfc-xe.html

C is correct

once the packet is marked the packet is then classified

The answer is C.

Altering the packet implies marking

Guys C is wrong - "in order to change the way traffic is treated in the network" - only policing can do that. Marking does not alter traffic movement!

QoS Packet Marking refers to changing a field within a packet either at Layer 2 (802.1Q/p CoS, MPLS EXP) or Layer 3 (IP Precedence, DSCP and/or IP ECN). It also refers to preserving any classification decision that was reached previously.

Answer is C: Marking

when traffic is classified it is then labelled so it is identifyable by the devices