Exam 350-401 topic 1 question 1013 discussion

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/21263-134.html#:~:text=Traffic%20shaping%20buffers%20out%2Dof%2Dprofile%20traffic%20and%20smoothes%20traffic%20bursts%2C%20but%20affects%20the%20delay%20and%20delay%20variation.%20Shaping%20can%20only%20be%20applied%20on%20an%20outgoing%20interface%2C%20while%20policing%20can%20be%20applied%20on%20both%20incoming%20and%20outgoing%20interfaces.

The correct answer is B: Traffic shaping must be applied only to outgoing traffic. Here's the explanation: Traffic shaping is fundamentally an outbound-only mechanism because: - It can only control traffic as it leaves an interface - It cannot shape traffic that is incoming to an interface - It requires a buffer to hold and delay packets, which only works on egress Why other options are incorrect: A) Lacks support for marking or remarking - Incorrect because traffic shaping can work in conjunction with marking/remarking mechanisms - Many implementations support both shaping and marking capabilities C) Can be applied in both traffic directions - Incorrect as explained above - shaping only works on outbound traffic - For inbound traffic control, policing would be used instead D) Queues out-of-profile packets until the buffer is full - Incorrect because traffic shaping will drop packets if the buffer becomes full - It doesn't simply queue indefinitely - When buffers are full, tail-drop or other configured drop mechanisms are implemented

B is correct

"Police inbound & Shape outbound" as a general rule B if you are going by what Cisco is stating: "Shaping can only be applied on an outgoing interface, while policing can be applied on both incoming and outgoing interfaces." Google search that string for multiple returns supporting that statement.

Since Traffic shaping can't apply marking A is wrong. Since Traffic shaping is an outbound only service that makes B & C Wrong. Thus making D the only option for a correct Answer, although watch the wording because it only uses that wording in the Supervisor documentation, is the general Traffic Shaping documentation it states it just controls the flow.

D is correct

C is correct. D also is correct. out and in

Shaping is for outbound traffic. https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html

Is everyone avoiding the fact that B - must be applied outbound only, is a strong characteristic of shaping?

-Official changing vote to D

i think should be C Traffic shaping can be used to manage and prioritize traffic flow on both incoming and outgoing network interfaces.

B https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html [ Selection Criteria] "Controls bursts and smooths the OUTPUT rate over at least eight time intervals."

D - wrong Does not Queue out-of-profile packets - it regulates the rate of traffic flow by delaying/shaping to match traffic profile