CDP - best practices

ISDN

QoS - CoS to DSCP and DSCP to CoS mapping

QoS - marking

Switch protected port limitations


A voice [VLAN](/vlan) is a specialized VLAN on a switch that is used to transmit voice over IP frames.  [It can be configured](/voip-configuring-a-switch-port-for-use-with-an-ip-phone) in such a way so that the switchport on which it is configured can have an IP phone connected to it, and a PC connected to the phone.  The voice will travel on the voice VLAN while the data from the PC will be placed on the data VLAN.

An IP phone will learn about the voice VLAN from [Cisco Discovery Protocol (CDP)](/cisco-discovery-protocol-cdp) messages.  

CDP will inform the IP phone of the voice VLAN ID being used and will also let it know about the [CoS](/qos-cos-vs-dscp)values the phone should configure for its voice traffic. If you disable CDP, then you must manually configure the voice VLAN on the IP phone. It will still work, but you need to take that extra step of manual configuration on the IP phone.

If you’re using a non-Cisco phone that doesn’t speak CDP, then you will have to configure the voice VLAN on the phone anyway.

Links:

https://forum.networklessons.com/t/voice-vlan/783/31?u=lagapides

https://networklessons.com/cisco/ccna-routing-switching-icnd1-100-105/voice-vlan

VoIP - Voice VLAN

VPN - default gateway of VPN client

VPN - split tunneling

VPN DVTI tunnel source

VRF - Definition mode

VRF - VPNv4 address

VRF capability vrf-lite command

VRF lite route leaking

VRF sharing across multiple routers

VRF use cases

VRRP - Virtual IP doesn't respond to pings

VRRP - load balancing

VRRP - support for authentication

VRRP - using the same ID on different interfaces

VRRP - using the same ID on subinterfaces

VRRP on sub-interfaces

VTP - Client can't modify VLANs

VTP - Multiple Servers with VTP version 2

VTP - Per interface configuration

VTP - Revision Numbers on transparent switch

VTP - Versions

VTP - domain name automatically changes

VTP - employing in an emulator

VTP - protecting switches from lower revision numbers

VTP Advertisements

VTP configuration checklist

VTP filtering shared VLANs

VTP how to disable the VLAN trunking protocol

VTP operation over trunks

VTP primary server

VTP revision number maximum

VTP revision number reset

VTP revision number

VXLAN - Use Cases

VXLAN - VLAN to VNI mapping

VXLAN - using an MP-BGP EVN control plane

VXLAN access trunk port

VXLAN

Value of Cisco certifications

Very-high-bit-rate  Digital Subscriber Line (VDSL)

Virtual Private LAN Service (VPLS)

Virtual Private Wire Service (VPWS)

Virtual Router Redundancy Protocol (VRRP)

Virtual Template Configuration

Virtualization functions - definition of terms

VoIP - Anatomy of a voice communication

VoIP - Configuring a switch port for use with an IP phone

VoIP IP phone registration issues

WAN - edge equipment names and terminology

WAN - how to choose a WAN technology

WAN - what is BVDSL

Wake on LAN

Why do we trust a website certificate

Wide Area Network

Wireless - Aggressive Client Load Balancing

Wireless - CAPWAP tunnel

Wireless - CSMA-CA

Wireless - FlexConnect Mode

Wireless - Light Weight Access Point Protocol (LWAPP)

Wireless - Lightweight Access Point

Wireless - Meraki Management Mode

Wireless - Orthogonal Frequency Division Multiple Access (OFDMA)

Wireless - Real-time and management functions

Wireless - Using GCMP with WPA2 and WPA3

Wireless - WLC authbypass feature

Wireless - WLC trunk connection to core

Wireless - WPA3

Wireless - Wi-Fi 2.4GHz frequency band and channels

Wireless - Wi-Fi 5 GHz frequency bands and channels

Wireless - Wi-Fi 6

Wireless - Wi-Fi 6E (Extended)

Wireless - Wi-Fi IEEE 802.11

Wireless - Wi-Fi Protected Access (WPA)

Wireless - Wired Equivalent Privacy (WEP)

Wireless - Wireless LAN Controller

Wireless - configure a 1941W router with a single subnet on wired and wireless interfaces

VoIP - Voice VLAN

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