I highly recommend - An Engineering Approach to Computer Networking: ATM Networks, the Internet, and the Telephone Network by S. Keshav. Unlike other books, it actually does give you a 360 degree view of the entire field which is no mean task.
On Operating Systems:
I have heard good things about Operating Systems: Three Easy Pieces by Arpaci-Dusseau though i haven't read it myself.
I highly recommend - An Engineering Approach to Computer Networking: ATM Networks, the Internet, and the Telephone Network by S. Keshav. Unlike other books, it actually does give you a 360 degree view of the entire field which is no mean task.
On Operating Systems:
I have heard good things about Operating Systems: Three Easy Pieces by Arpaci-Dusseau though i haven't read it myself.