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?
Router# configure terminal

An administrator configures Cisco UCM to use UDP for SIP signaling and finds that an endpoint cannot make calls.
Which action resolves this issue?

Which DSCP value and PHB equivalent are the default for audio calls?

Which DiffServ marking is the most likely to drop packets?

A collaboration engineer is troubleshooting issues with a T1 PRI. The engineer wants to confirm if the router received an ISDN Set Asynchronous Balanced Mode Extended message and responded with an Unnumbered Acknowledge frame. Which Cisco IOS command is used to debug ISDN Layer 2 issues?