A Cisco engineer must configure a single switch interface to meet these requirements: ✑ Accept untagged frames and place them in VLAN 20 Accept tagged frames in VLAN 30 when CDP detects a Cisco IP phone Which command set must the engineer apply?
B should be the answer.
With D, the interface operates in trunk mode. So the access configuration is not taken into account and the vlan 20 will be tagged.
The answer is B.
The data vlan is connected to the IP phone. Data VLANs connected to the IP phones are untagged by default.
https://www.practicalnetworking.net/stand-alone/voice-vlan-auxiliary-vlan/
https://docs.nvidia.com/networking-ethernet-software/cumulus-linux-40/Layer-2/Link-Layer-Discovery-Protocol/Voice-VLAN/
The IP phone connected to a switchport should learn its vlan using cdp. To configure this, the command is "switchport voice Vlan 30"
Also from the options provided, only B is configured as an access port.
Cisco recommends using an access for for Voice VLAN configuration on a switchport. Pls note that this statement doesn't make a trunk port configuration impossible but I do you think Cisco would choose an answer that contradicts their recommendations?
"Voice VLAN Configuration Guidelines These are the voice VLAN configuration guidelines: • You should configure voice VLAN on switch access ports; voice VLAN is not supported on trunk ports. Note Voice VLAN is only supported on access ports and not on trunk ports, even though the configuration is allowed."
Cisco
https://www.cisco.com › scgPDF
Configuring Voice VLAN
This configuration uses an access port, which is a common and valid setup for connecting a Cisco IP phone with a PC behind it:
Untagged frames (e.g., from the PC) are placed in VLAN 20 (access VLAN).
Tagged frames from the IP phone, detected via CDP, are placed in VLAN 30 (voice VLAN).
Cisco switches support this dual-VLAN capability on access ports when a voice VLAN is configured, making it the simplest and most reliable solution for the requirements.
Per Cisco documentation under the subtopic line Voice VLAN Configuration Guidelines, "Voice VLAN is only supported on access ports and not on trunk ports, even though the configuration is allowed.
Quoted directly from the following source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_44_se/configuration/guide/scg/swvoip.html#wp1033848
switchport mode access switchport access vlan 20 switchport voice vlan 30
Explanation:
switchport mode access is used to set the switchport to access mode, which allows untagged frames to enter the VLAN specified by switchport access vlan 20.
switchport access vlan 20 assigns untagged frames to VLAN 20.
switchport voice vlan 30 configures the voice VLAN for Cisco IP phones. This command ensures that tagged frames detected by CDP from a Cisco IP phone will be placed in VLAN 30.
Option B meets both of the specified requirements.
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
foreach
Highly Voted 2 years, 7 months ago[Removed]
Highly Voted 2 years, 5 months ago[Removed]
2 years, 5 months agoelnook
Most Recent 6 days, 6 hours agoxtraMiles
8 months, 1 week agoJorgePit
8 months, 3 weeks ago1b81c0c
10 months, 3 weeks ago[Removed]
1 year agof2faf2e
1 year, 1 month agokyleptt
1 year, 6 months agoDa_Costa
1 year, 6 months agowakaish
1 year, 6 months agoshumps
1 year, 8 months agoxbololi
1 year, 9 months agoJorro99404
1 year, 10 months agodropspablo
1 year, 10 months agoking_oat
1 year, 11 months agoomikun
1 year, 11 months ago