

David Bombal
David Bombal
Want to learn about IT? Want to get ahead in your career? Well, this is the right place!
On this channel, I discuss Python, Ethical Hacking, Networking, Network Automation, CCNA, Virtualization and other IT related topics.
This YouTube channel has new videos every week! Subscribe for technical, detailed, no fluff content.
David’s details:
Discord: https://discord.com/invite/usKSyzb
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
YouTube: https://www.youtube.com/davidbombal
All the best!
David
On this channel, I discuss Python, Ethical Hacking, Networking, Network Automation, CCNA, Virtualization and other IT related topics.
This YouTube channel has new videos every week! Subscribe for technical, detailed, no fluff content.
David’s details:
Discord: https://discord.com/invite/usKSyzb
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
YouTube: https://www.youtube.com/davidbombal
All the best!
David
Episodes
Mentioned books

Oct 14, 2019 • 22min
#95: GNS3 Install: VMware Workstation Pro
Want to know how to install, configure and setup GNS3 2.2? Well, these videos show you how. In this video, I show you how to integrate the GNS3 VM with the GNS3 GUI, setup Intel VTX in your computer's BIOS and make sure nested virtualization is enabled. Follow these steps to make sure you can get your GNS3 network working in preparation to run Cisco devices such as Cisco VIRL appliances on GNS3.
In subsequent videos I'll show you how to download Cisco IOS images and use them in GNS3.
Previous Video: https://youtu.be/Ibe3hgP8gCA
=================================
Menu:
=================================
Overview: 0:01
Download GNS3 VM: 2:19
Download VMware Workstation: 4:10
Install VMware Workstation: 5:03
Import GNS3 VM into VMware: 7:50
GNS3 GUI and GNS3 VM integration: 8:32
KVM support available: True: 10:30
Configure VTx in Computer BIOS: 11:04
Enable GNS3 KVM Support: 13:45
GNS3 RAM and CPU: 14:12
New Project: 16:25
Save project and restore project: 18:45
=================================
Calculators:
=================================
VIRL Resource Calculator: http://bit.ly/sizevirl
GNS3 Calculator http://bit.ly/gns3requirements
=================================
GNS3 links:
=================================
GNS3 website: https://gns3.com/
GNS3 GitHub page: https://github.com/GNS3/gns3-gui/releases
Free Solar-PuTTY: http://bit.ly/SolarPutty
Free Engineers Toolset: http://bit.ly/gns3toolset
What is VTX / x86 virtualization? https://en.wikipedia.org/wiki/X86_virtualization
=================================
Free Software:
=================================
SolarWinds TFTP Server: http://bit.ly/2mbtD6j
WAN Killer: http://bit.ly/wankiller
Engineers Toolset: http://bit.ly/gns3toolset
IP Address Scanner: http://bit.ly/swipscan
Network Device Scanner: http://bit.ly/swnetscan
Wifi Heat Map: http://bit.ly/wifiheat
Wifi Analyzer: http://bit.ly/swwifianalyzer
SolarWinds NPM: http://bit.ly/getnpm
================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
GNS3
EVE-NG
VIRL
Packet Tracer
10x Engineer
CCNA
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#gns3 #eveng #virl

Oct 14, 2019 • 18min
#94: GNS3 Installation
Want to know how to install, configure and setup GNS3 2.2? Well, these videos show you how. In this first video, I show you how to download the components you require and how to install the GNS3 GUI on Windows 10. We build a basic network using GNS3 version 22. In subsequent videos I'll show you how to use the GNS3 2.2 Web-UI and GNS3 VM and then how to build a network using Cisco VIRL IOS images.
=================================
Menu:
=================================
Overview: 0:40
Download GNS3: 2:38
Install GNS3 GUI: 4:27
GNS3 start: 7:36
First GNS3 project: 9:10
Change symbols / icons: 10:12
SolarPutty fonts: 11:50
Configure VPCS PCs: 13:24
Save topology: 14:18
Restart GNS3: 14:53
=================================
GNS3 links:
=================================
GNS3 website: https://gns3.com/
GNS3 GitHub page: https://github.com/GNS3/gns3-gui/releases
Free Solar-PuTTY: http://bit.ly/SolarPutty
Free Engineers Toolset: http://bit.ly/gns3toolset
=================================
Free Software links:
=================================
SolarWinds TFTP Server: http://bit.ly/2mbtD6j
WAN Killer: http://bit.ly/wankiller
Engineers Toolset: http://bit.ly/gns3toolset
IP Address Scanner: http://bit.ly/swipscan
Network Device Scanner: http://bit.ly/swnetscan
Wifi Heat Map: http://bit.ly/wifiheat
Wifi Analyzer: http://bit.ly/swwifianalyzer
SolarWinds NPM: http://bit.ly/getnpm
================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
10x Engineer
CCNA
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#gns3 #eveng #virl

Oct 7, 2019 • 15min
#93: Do you know these Cisco IOS Commands?
How well do you know the Cisco IOS? Do you know these Cisco IOS commands? Hidden giveaways in this video :)
Amaze others with your knowledge of the Cisco IOS. You don't need python for these scripts. Rock that job interview and show senior network engineers what you can do. Keep on learning and change your life. Get that good paying job by showing your skills.
=================================
Menu:
=================================
^ 1:06
$ 1:52
. 2:26
\ 2:54
| 3:20
linenum 4:44
_ 5:55
? 6:35
sh run all 8:15
default interface 11:05
reload in / at 12:24
=================================
Documentation:
=================================
Cisco IOS Fundamentals: http://bit.ly/2k3YFMG
================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
=================================
Free TFTP Server:
=================================
Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j
10x Engineer
CCNA
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#linux #cisco #DevNet

Oct 2, 2019 • 30min
#92: Python and Linux on Cisco IOS?
Run Python and Linux directly on IOS XE? Yes you can! Take your network automation skills to the next level with scripting and automation directly on Cisco devices. You can be a DevNet Engineer!
Amaze others with your knowledge of the Cisco IOS. You don't need python for these scripts. Rock that job interview and show senior network engineers what you can do. Keep on learning and change your life. Get that good paying job by showing your skills.
Menu:
Overview: 0:01
Lab Setup (GNS3 / CSR): 2:00
IOS XE & Container explanation: 3:14
Guestshell Setup: 7:14
Access the Linux Shell: 13:48
Sort out routing: 15:11
SSH to Guestshell remotely: 19:30
Install applications: 22:20
Python scripting: 23:14
=================================
Documentation:
=================================
Cisco IOS Shell Configuration Guide: http://bit.ly/2kwMyYN
================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
=================================
Free TFTP Server:
=================================
Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j
=================================
Free DevNet Labs:
=================================
DevNet Lab: Introduction to the Guest Shell: http://bit.ly/2oq9fj7
DevNet Lab: Introduction to On-Box Python: http://bit.ly/2nEXjcI
=================================
CSR Configuration steps:
=================================
! Check if service is running
en
show iox-service
! Configure Basics
conf t
hostname CSR1
interface GigabitEthernet1
no shut
ip address 10.1.1.1 255.255.255.0
exit
exit
! Enable the service
conf t
iox
exit
show iox-service
! Configure Virtual Port
conf t
interface VirtualPortGroup0
ip unnumbered GigabitEthernet1
exit
exit
! Enable the guestshell
guestshell enable VirtualPortGroup 0 guest-ip 10.1.1.2
! Access guestshell
guestshell run bash
! Add DNS information to Linux container
echo nameserver 8.8.8.8 | sudo tee —append /etc/resolv.conf
! Need to set up routing so Router knows how to route
conf t
ip route 10.1.1.2 255.255.255.255 virtualportgroup 0
ip route 0.0.0.0 0.0.0.0 10.1.1.254
ip domain-lookup
ip name-server 8.8.8.8
exit
! Check stuff on guestshell host
======================
sudo ifconfig
cat /etc/resolv.conf
!Add a user
sudo useradd david
sudo passwd david
! Install nano and Python 3
sudo yum install nano -y
! You don't need Python3 for these script examples
sudo yum install python3
=================================
Python Script:
=================================
import sys
import cli
cli.executep(‘show ip int brief’)
cli.executep(‘show ver’)
=================================
Documentation
=================================
Programmability Configuration Guide, Cisco IOS XE Fuji 16.9.x: http://bit.ly/2lUSETq
Programmability Configuration Guide, Cisco IOS XE Gibraltar 16.10.x: http://bit.ly/2mErAIo
DevNet presentation: http://bit.ly/2lWedD8
Hank Preston: http://bit.ly/2nu4VyG
DevNet
10x Engineer
CCNA
Cisco Devnet Associate
Python
Devnet cert
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#python #linux #DevNet

Oct 2, 2019 • 12min
#91: Linux scripts on Cisco IOS?
Did you know you could use these Linux Shell scripts directly on Cisco IOS! No need to use Python or use a Linux VM. Just run these directly on Cisco IOS! You can be a 10x Engineer!
Amaze others with your knowledge of the Cisco IOS. You don't need python for these scripts. Rock that job interview and show senior network engineers what you can do. Keep on learning and change your life. Get that good paying job by showing your skills.
=================================
Documentation:
=================================
Cisco IOS Shell Configuration Guide: http://bit.ly/2kwMyYN
================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
=================================
Free TFTP Server:
=================================
Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j
You don't need a linux shell or linux virtual machine to use these commands. You can use them directly in classic Cisco IOS!
=================================
Script 1:
=================================
for xx in `interface Ethernet`; do echo $xx; done
=================================
Script 2:
=================================
for xx in `interface Ethernet`; do echo $xx `show int $xx | inc input errors` ; done
=================================
Script 3:
=================================
function shrun(){
n=-1
while true; do
let n++
if [[ $n -le 3 ]]; then
show run int g0/$n
echo $n
else
break;
fi
done
}
10x Engineer
CCNA
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#linux #cisco #DevNet

Sep 25, 2019 • 20min
#90: How well do you know Cisco IOS?
Do you know these time saving Cisco IOS commands? Did you know this was possible traditional Cisco IOS? Use /, +, -, grep, include, section, exclude and lots more directly on Cisco IOS. Be a 10x engineer and show the world your Cisco and Linux skills.
=================================
Menu:
=================================
Documentation Reference: 0:27
Network Topology: 0:59
Cool IOS commands: / + - : 1:35
Linux options on Cisco IOS: 10:17
Personalized sections using grep: 12:30
=================================
More information here:
=================================
Cisco IOS Fundamentals: http://bit.ly/2mTmnfL
Linux Shell: http://bit.ly/2kwMyYN
=================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
You don't need a linux shell or linux virtual machine to use these commands. You can use them directly in classic Cisco IOS!
10x Engineer
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
DevNet
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#linux #ccna #DevNet

Sep 23, 2019 • 10min
#89: What's your focus? What are you doing?
Giveaway in memory of my Father. What are you doing with your life? Are you working towards your goals? Or are you wasting your time? What are you goals? Have you written them down? Be effective. Don't be busy.
Free Wireshark link (first 40 people): See video
Free Wireshark random giveaway: http://bit.ly/2mkaMpA
Books:
The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change: https://amzn.to/34WseCt
Living Forward: A Proven Plan to Stop Drifting and Get the Life You Want: https://amzn.to/2NqObE5
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#ccna #wireshark #motivation

Sep 19, 2019 • 26min
#88: DHCP Explained - Step by Step Server Configuration
What is DHCP? How does it actually work? This video shows you practical examples of DHCP in real time and includes Wireshark captures showing you actual DHCP messages.
Menu:
Introduction and basic terms: 00:014
iPhone DHCP Client explanation: 03:46
Lab and DHCP server configuration: 07:54
Cool Wireshark Flow Graph: 15:15
Wireshark deep dive: 17:23
Cisco router output: 22:25
Linux client and Wireshark coolness: 23:07
This video also discusses the difference between static and dynamic IP addresses.
DHCP messages:
DHCPDiscover - Sent by client. Discover / find DHCP servers on the network.
DHCPOffer - Sent by server. Offering an IP address and other parameters for the client to use.
DHCPRequest - Sent by client. The client requests the address that was offered by the server.
DHCPACK - Sent by Server to acknowledge client. Contains information like IP address, lease time, default-gateway and other information.
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#dhcp #dhcpserver #dhcpexplained

Sep 19, 2019 • 7min
#87: Massive CCNA Giveaway! Be quick!
Want to win one of over $3,000 worth of prizes? Boson, CCNA, Python and Wireshark prizes available. Individual prizes vary from about $19 to $369 each.
=================================
Boson Giveaway:
=================================
Enter here: http://bit.ly/2knqWy4
Didn't the Boson giveaway? You can buy it here: http://bit.ly/bosondavidbombal
Boson ExSim-Max Practice Exams: http://bit.ly/BosonExSim
Boson home page: http://bit.ly/2LX27oL
Boson NetSim: http://bit.ly/BosonNetSim
=================================
Wireshark Giveaway:
=================================
First 25 free: http://bit.ly/2kggQ1K
Or, get the course for $10 here: http://bit.ly/2IXZnn8
=================================
Python Giveaway:
=================================
First 25 free: http://bit.ly/2lWg5eB
Or, get the course for $10 here: http://bit.ly/2Wwb0aD
=================================
David Bombal Subscription Giveaway:
=================================
Enter here: http://bit.ly/2mdXECo
Or join immediately here: http://bit.ly/2kyjAb7
================================
Free TFTP Server:
=================================
Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j
10x Engineer
CCNA
DevNet
Cisco Devnet Associate
Wireshark
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
Python
Network Automation
Network Programmability
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#ccna #python #wireshark

Sep 17, 2019 • 17min
#86: Network Automation: Schedule Cisco config backups with kron and archive
Network Automation isn't difficult. With just a few CLI commands you can automate the backup of your Cisco networks. Use Kron and archive to back up configs to TFTP, FTP or SCP servers. Don't try to do everything manually. Automate it! Just like cron in Linux, you can use kron on Cisco IOS to schedule things. Schedule backups, schedule TCL scripts and much more.
Amaze others with your knowledge of the Cisco IOS. You don't need python for these scripts. Rock that job interview and show senior network engineers what you can do. Keep on learning and change your life. Get that good paying job by showing your skills.
Menu:
1) Intro: 0:01
2) IOS requirements: 2:02
3) Lab Setup: 2:42
4) Kron config: 4:24
5) Archive config: 9:01
In later videos I'll show you how to use Python scripts and other cool options on Cisco IOS devices.
================================
Free TFTP Server:
=================================
Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j
=================================
Documentation:
=================================
Kron: http://bit.ly/2kkgIhU
Archive:
http://bit.ly/2kI8BMb
http://bit.ly/2mgQa1L
=================================
Books:
=================================
Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z
=================================
Kron Script:
=================================
kron policy-list backupconfig
cli show running-config | redirect tftp://10.1.3.4/r1-shrun.cfg
kron occurrence backupminute in 1 recurring
policy-list backupconfig
kron occurrence backupweekly at 23:00 Sun recurring
policy-list backupconfig
debug kron all
show kron schedule
=================================
Archive Script:
=================================
archive
log config
logging enable
hidekeys
path tftp://10.1.3.4/$h-
wr
time-peiod 10080
!
sh archive
=================================
10x Engineer
CCNA
DevNet
Cisco Devnet Associate
CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional
Python
Network Automation
Network Programmability
LPIC 1
LPIC 2
Linux Professional Institute
LX0-103
LX0-104
XK0-004
How did you find this video? Did you enjoy learning about kron and the archive of your configs? scripts? All the best!
David Bombal
David’s details:
YouTube: https://www.youtube.com/davidbombal
Twitter: https://www.twitter.com/davidbombal
Instagram: https://www.instagram.com/davidbombal
LinkedIn: https://www.linkedin.com/in/davidbombal
Facebook: https://www.facebook.com/davidbombal.co
Website: http://www.davidbombal.com
#ccna #devnet #python