Goalkeeper Glyn Garner saved a penalty on his debut as Newport's unbeaten pre-season friendly campaign continued.
Robbie Matthews and trialist Craig Frater got County well on their way at Chippenham with first-half strikes.
Ex-Wales international Garner, 33, who signed last week after being released by League Two side Shrewsbury Town, denied Lewis Powell from the spot.
Prolific striker Sam Foley was then on target for the Exiles as they prepare for their Blue Square Premier debut.
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