Whatisrequiredtoenabletheuseofmetricslargerthan63fortrafficengineeringinIS－IS?() A.Nothing，widemetricsareusedbydefaultinIS-ISB.Enablewide-metrics-onlyunderprotocolIS-ISC.Enabletraffic-engineeringunderprotocolsIS-ISD.DisableTVL’s2and128whichcarrythe6-bitmetrics（0-63）.

Whatisrequiredtoenabletheuseofmetricslargerthan63fortrafficengineeringinIS－IS?()

A.Nothing，widemetricsareusedbydefaultinIS-IS

B.Enablewide-metrics-onlyunderprotocolIS-IS