Tag Archives: study

CCDE Written Reading List

Art of Network Architecture 

CCIE Vol 1

Definitive MPLS Network Designs

Designing for Cisco Network Service Architectures (ARCH) Foundation Learning Guide: CCDP ARCH 300-320 (4thEdition) (Foundation Learning Guides) 4th

End-to-End QoS Network Design 

Layer 2 VPN Architectures 

Network Management Fundamentals 

Network Security Architectures 

Optimal Routing Design

Routing TCP/IP Vol 1

Routing TCP/IP Vol 2

Top-Down Network Design

Linux Fundamentals Notes

Here are some more notes as you prepare for the latest version of the Linux+ exam.

Controlling Hardware in Linux 

  • Linux actually refers to the kernel (core OS component)
  • The BIOS/UEFI starts the boot loader which starts the operating system kernel of Linux
  • The kernel coordinates actions between the hardware and the software
  • It runs in ring zero or often called kernel space
  • The user space tends to refer to everything out of the kernel space
  • The Linux kernel is tasked with driving the hardware in use
  • It exports data about the detected hardware using the /sys and /proc virtual file systems
  • Applications often access devices using the files created in /dev; specific files represent specific devices, for example: 
    • Disk drive – /dev/sda
    • Partition – /dev/sda1
    • Mice – /dev/input/mouse0
    • Keyboards – /dev/input/event0
    • Sound card – /dev/snd/*
    • Serial ports – /dev/ttyS*
  • You can tell which type of file you have (block versus character) when you list the files – note the use of the b or c character in the ls output