This is Jimmy Page's solo which occurs throughout the song outro. It's not for beginners, as it is a fast solo with some quite tricky timing.

He starts off by using the A Pentatonic minor scale, in typical blues / rock style. Jimmy was particularly fond of this scale and used it a lot for solos (e.g. Stairway to Heaven). He mainly uses the 'E shape' pentatonic minor scale at fret 5 (which gives us the A minor pentatonic).

Scales work the same as chords in this way...

If you play an open E minor chord, you get E. But if you shift the chord up to the 5th fret (barre chord), you get an A minor chord instead. The exact same logic applies to scale shapes. If you play an open E pentatonic minor scale, that is what you get. But you can shift the same scale pattern up to fret 5 (use your 1st finger to replace the open string notes). Then you will be playing an A pentatonic minor scale instead.

This is very useful because you can learn 1 scale and use it to create solos over almost any backing chord. All you need to know is - what the backing chord is, and where that root note can be found along the Low E string. So, if the backing chord is G minor, then play the scale at fret 3. If it is B minor, then fret 7.

If you would like to practice the Pentatonic minor scale (and of all scales you should know this one - especially if you are a blues / rock fan) - go here.