Arsenal and Spurs cancelled each other out in a typically high-tempo North London derby at the Emirates on Sunday afternoon, in what was a close encounter between two seemingly evenly matched teams.

Harry Kane's second half penalty denied the Gunners the chance to go top and maintained the visitors unbeaten start to the Premier League season.

Both sides have lost ground on leaders Chelsea, however, so there may be a sense of disappointment in the result.

Here are five things we learned from the competitive stalemate...
5. Spurs Really Are a Tough Nut to Crack

Arsenal v Tottenham Hotspur - Premier League
Spurs had already proven they were tough to beat before they made the short trip to the Emirates, but this result really rubber stamped it.

Eleven games into the season, in what some people consider the toughest league in the world, and they are still yet to taste defeat. Against Arsenal, they could even have come away with all three points, Christian Eriksen's free kick striking the post late on.

This was arguably their toughest test so far. Arsenal have been an imposing presence at home of late, but Spurs were typically combative and defended resolutely to remain undefeated.
4. Both Sides Will Need to Improve to Remain at the Top

Arsenal v Tottenham Hotspur - Premier League
It may seem harsh to suggest that improvements need to be made after both have made more than respectable starts to the season, but neither performed brilliantly on Sunday.

It could be put down to the fact it was a big derby game with high stakes, although both sides were at times profligate with their chances. Spurs may still be unbeaten, but they remain in fifth in what looks like being a highly competitive Premier League. As for Arsenal, they would've considered the draw two dropped points after the mistake that resulted in Harry Kane's equaliser from the spot.

And with both Chelsea and Liverpool looking formidable in recent weeks, the two North London sides may well have to be at their very best to keep up.
3. Tottenham Need a Fit and Firing Harry Kane

It's no surprise that Spurs' goals decreased in number during Harry Kane's spell on the sidelines.

And he was immediately back on the scoresheet in his return at the Emirates, albeit from the penalty spot. The lack of goals has been a concern for Mauricio Pochettino, however, with Vincent Janssen yet to settle since joining from AZ Alkmaar. But a fit Kane is almost a guarantee of goals, so it's imperative that he gets back up and running quickly.

He could well have scored a second but for Nacho Monreal's heroics. Even when clearly lacking match fitness he's still an undoubted threat.
2. Arsenal Miss Santi Cazorla

Arsenal v Southampton - Premier League
The absence of the diminutive Spaniard has certainly been felt at the Emirates, and against Spurs it was more evident than ever.

While Francis Coquelin and Granit Xhaka did well and were workmanlike in midfield, the Gunners missed the control Cazorla brings to games like this one. He would've allowed his teammates to settle with his composed retention of the ball and perhaps slowed down what was at times a frantic contest.

Unfortunately for Arsene Wenger though, he was unavailable through injury.
1. Both Sides Have Strength in Depth

While the aforementioned Santi Cazorla was a notable absentee for the Gunners, they have more than enough options in midfield to adequately fill the gap.

The same can be said for Spurs, who, without key players such as Dele Alli and Toby Alderweireld, not only defended well but looked threatening in attack to boot.

Both sides will certainly utilise their improved squad depth as the season progresses, particularly if they maintain a title challenge throughout.