Books similar to Network lessons and materials used?

1

Are there any books that are similar to Network lessons in the way they are described and explained, I think this site and books suit my learning style , as opposed to learning videos.

There are also subjects that aren’t covered here that yet like VOIP here ,CCNP Security , firepower, ISE, Wifi & other vendor firewalls for instance Juniper, Fortinet , Palo Alto & Checkpoint.
It would be great if there was similar material for everything above.
What Materials do others use?

2

Hi Philip,

For the ASA, I like the material from Harris Andrea:

https://www.networkstraining.com/ciscoasaebook.php

He has a nice writing style, simple and to the point.

Rene