My attempt at the July 2015 Verified Effective practice question

Function_Get-SysCorpInfo.ps1

<#
.Synopsis
   Get simple Bios and OS info
.DESCRIPTION
   Queries Win32_BIOS and Win32_Operating system over WsMan (default) or DCom protols to obtain Bios Serial, Service Pack Version and OSVersion info

.EXAMPLE
   PS> Get-CorpSysInfo -ComputerName win81 -Protocol dcom
   
    BIOSSerial                    ComputerName                                      SPVersion OSVersion                    
    ----------                    ------------                                      --------- ---------                    
    VMware-56 4d 09 95 89 20 e... win81                                                     0 6.3.9600

.EXAMPLE
   PS> Get-CorpSysInfo -ComputerName win81 -Verbose
    VERBOSE: Attempting connection to win81 over Wsman
    VERBOSE: Operation '' complete.
    VERBOSE: Perform operation 'Enumerate CimInstances' with following parameters, 
    ''namespaceName' = root\cimv2,'className' = Win32_OperatingSystem'.
    VERBOSE: Operation 'Enumerate CimInstances' complete.
    VERBOSE: Perform operation 'Enumerate CimInstances' with following parameters, 
    ''namespaceName' = root\cimv2,'className' = Win32_BIOS'.
    VERBOSE: Operation 'Enumerate CimInstances' complete.

    BIOSSerial                    ComputerName                                      SPVersion OSVersion                    
    ----------                    ------------                                      --------- ---------                    
    VMware-56 4d 09 95 89 20 e... win81                                                     0 6.3.9600                     


#>
#Requires -Version 3

function Get-CorpSysInfo
{
    [CmdletBinding()]
    
    Param
    (
        # ComputerName to connect to. Can be supplied by the pipeline
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$true,
                   Position=0)]
        [string[]]
        $ComputerName,

        # Protocol with which to establish Cim Session. Valid options are "WSMAN" (default) or "DCom"
        [Parameter(Mandatory=$false,
                   Position=1)]
        [ValidateSet('Dcom','Wsman')]
        [string]
        $Protocol = 'WSMan'
    )

    Begin
    {
        
    }
    Process
    {
        Write-Verbose "Process block started"
        ForEach ($Computer in $ComputerName)
        {
            Try
            {
                #Write-Verbose "Try block started"
                $Operation = $Null
                Write-Verbose "Attempting to connect to $Computer over $Protocol"
                $UseProtocol = New-CimSessionOption -Protocol $Protocol
                $Session = New-CimSession -ComputerName $Computer -SessionOption $UseProtocol -ErrorAction Stop
                #Write-Verbose "Operation '$Operation' Complete"

                $Operation = 'Enumerate CimInstances'
                $Namespace = 'root\cimv2'
                $ClassName = 'Win32_OperatingSystem'
            
                #Write-Verbose "Perform operation '$Operation' with following parameters, ''namespaceName' = $NameSpace,'className' = $ClassName'"
                $OS = Get-CimInstance -CimSession $Session -ClassName $ClassName -Namespace $Namespace
                #Write-Verbose "Operation '$Operation' Complete"

                $ClassName = 'Win32_BIOS'

                #Write-Verbose "Perform operation '$Operation' with following parameters, ''namespaceName' = $NameSpace,'className' = $ClassName'"
                $BIOS = Get-CimInstance -CimSession $Session -ClassName $ClassName -Namespace $Namespace
                #Write-Verbose "Operation '$Operation' Complete"
             

                New-Object PSCustomObject -Property @{
                        'BIOSSerial'=$BIOS.SerialNumber
                        'ComputerName'=$Computer
                        'SPVersion'=$OS.ServicePackMajorVersion
                        'OSVersion'=$OS.Version}|Write-Output
            
            }
            Catch #Generic Catchall
            {
                Write-Error $_
                Write-Warning "Failed establishing connection to $Computer"
            }
            
       }#End ForEach             

    } #End Process
    
    End
    {

        

    } #End End
}