Exam 200-105 topic 1 question 11 discussion

According to Cisco website listed below: The answer should be A. Under " Enabling QoS" heading: Input Port Handling The main configuration parameter for the ingress port, regarding classification, is the trust state of the port. Each port of the system can have one of the following trust states: trust-ip-precedence trust-dscp trust-cos untrusted Note: By default all ports are in the untrusted state when QoS is enabled.

Answer A

correct answer is A , And answer E is just true for switch port mode Access but has nothing to do with QoS.

Answer is A Note: By default all ports are in the untrusted state when QoS is enabled. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23420-138.html

The answer should be A. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23420-138.html Note: By default all ports are in the untrusted state when QoS is enabled.

Correct Answer: E Explanation: Frames received from users in the administratively-defined VLANs are classified or tagged for transmission to other devices. Based on rules that you define, a unique identifier (the tag) is inserted in each frame header before it is forwarded. The tag is examined and understood by each device before any broadcasts or transmissions to other switches, routers, or end stations. When the frame reaches the last switch or router, the tag is removed before the frame is sent to the target end station. VLANs that are assigned on trunk or access ports without identification or a tag are called native or untagged frames. For IEEE 802.1Q frames with tag information, the priority value from the header frame is used. For native frames, the default priority of the input port is used. Each port on the switch has a single receive queue buffer (the ingress port) for incoming traffic. When an untagged frame arrives, it is assigned the value of the port as its port default priority. You assign this value by using the CLI or CMS. A tagged frame continues to use its assigned CoS value when it passes through the ingress port.

The correct answer is E. Packets that arrive with a tag are untagged at the edge of an administrative domain.