Which configuration tells a switch port to send Cisco Discovery Protocol packets that configure an attached Cisco IP phone to trust tagged traffic that is received from a device that is connected to the access port on the Cisco IP phone?
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-5SY/config_guide/sup6T/15_5_sy_swcg_6T/voip.pdf
Here is the documentation of your correct answer Griswald
I hate questions like this one. A good engineer doesn’t need to know the exact command. Whether it is platform qos trust extend or platform qos extend trust. Some people get words and letters mixed up in their head. But they’ll have no issues in front of the CLI for something like this…
Actually, whoever is not CCNP does not mean to be bad cisco engineer. However certification it is just a requisite to get the best salaries, see it as a good investment in money and time =).
Of course answer is A, but I am surprised to take a Catalyst 6T as a example of access switch, I was used to see tha command "switchport priority extend trust" in for example switches 3650 hahahahahaha
This question is based on the document "Cisco IOS Software Configuration Guide, Release 15.0SY" Chapter 1 Cisco IP Phone Support. This is a document for a Catalyst 6500.
To send CDP packets that configure an attached Cisco IP phone to trust tagged traffic received from
a device connected to the access port on the Cisco IP phone, do not enter the cos keyword and CoS
value.
• To send CDP packets that configure an attached Cisco IP phone to mark tagged ingress traffic
received from a device connected to the access port on the Cisco IP phone, enter the cos keyword
and CoS value (valid values are 0 through 7).
Reading more I suggest that right answer is A:
This example shows how to configure Gigabit Ethernet port 5/1 to send CDP packets that tell the
Cisco IP phone to configure its access port as trusted:
Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend
I go with B: This example shows how to configure Gigabit Ethernet port 5/1 to send CDP packets that tell the
Cisco IP phone to configure its access port as untrusted and to mark all tagged traffic received from a
device connected to the access port on the Cisco IP phone with CoS 3:
Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend cos 3
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-5SY/config_guide/sup6T/15_5_sy_swcg_6T/voip.pdf
From the link you shared :
This example shows how to configure Gigabit Ethernet port 5/1 to send CDP packets that tell the
Cisco IP phone to configure its access port as trusted:
Router# configure terminal
Router(config)# interface gigabitethernet 5/1
Router(config-if)# platform qos trust extend
Thus A
"The trusted boundary feature is implemented with the platform qos trust extend command"
upvoted 2 times
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