The result marked our first home victory since the 2-1 win over Chelsea more than two months ago, and there was also a personal landmark for David to celebrate.
"The nice thing is that it was my first clean sheet at home after conceding one goal in each of the other three home matches I have played - something that was very frustrating.
"The game against Derby was great. The early goal gave us something to build on but I thought the overall team performance was very good. It was a continuation of what we have been doing in the previous few games and that is all we can ask for.
"It was a bit scrappy in the first half but Derby were always going to be a tough proposition. They had a very good result against Aston Villa a few days earlier and are fighting hard at the wrong end of the table, so they were never going to lie down against us.
"Carbone's sending off had a lot of influence on the game but we took full advantage and if hadn't been for Poom, it could have been five or six.
"A red card for the opponents can sometimes affect you in an adverse way, if they fire themselves up to beat the odds, but we dealt with it well, took our chances and then had time for some showboating towards the end.
"I had a good view of Trevor Sinclair's goal and Joe's little flick-up and cross was just as impressive as the finish, so it was a wonderful goal all round."
The Hammers keeper admits that confidence is now high around the training ground after five matches unbeaten and insists that no complacency will settle in as the busy Christmas and New Year schedule reaches its conclusion.
"Confidence is great. There is a possibility you can become over-confident but I haven't seen any signs of that so it's not a fear I've got.
"Glenn and Paul will ensure that confidence is kept at the right level and there is always time for a bit of showboating when you are 4-0 up. We have shown in other games that we can be fully disciplined when we need to be in order to secure a result."
Discipline will certainly be needed against the prolific strikeforces that Hammers will encounter in the next two matches, and David admits that the team will need to repeat the form that saw them take four points from Arsenal and Manchester United recently.
"We've got Liverpool and Leeds next and the bottom line is that if you play consistently, you give yourself a better chance," he says.
"The frustration of the Leicester game was that we arguably didn't play as well, but we kept our shape and ground out a result when things weren't going well in a game that we hoped to win.
"It's nice to be frustrated about not picking up three points rather than be thankful for a point. It shows we are confident and setting targets for ourselves. If we approach the likes of Liverpool and Leeds with that same attitude, I'm sure we will do ourselves justice."