A technician configures a switch with these commands:

SwitchA$($config$)$# interface vlan $1$

SwitchA$($config$-$if$)$# ip address $192\mathrm{.}168\mathrm{.}1\mathrm{.}1255\mathrm{.}255\mathrm{.}255\mathrm{.}0$

SwitchA$($config$-$if$)$# no shutdown

What is the technician configuring?