windows commands

 

C:\Users\asus>dir /a

C:\Users\asus>dir /s

C:\Users\asus>type test.txt

C:\Users\asus>whoami /all

C:\Users\asus>net user

C:\Users\asus>net user asus

C:\Users\asus>systeminfo

C:\Users\asus>doskey /history

tasklist

history

show history

dir /a

How to enable nested virtualization for KVM in CentOS/RHEL

 [root@localhost ~]# grep -e 'vmx' /proc/cpuinfo

[root@localhost ~]# grep -e 'svm' /proc/cpuinfo

c:\Program Files\Oracle\VirtualBox>VBoxManage.exe modifyvm RHEL8 --nested-hw-virt on

for old vbox

C:\Program Files\Oracle\VirtualBox>VBoxManage.exe modifyvm kvm --hwvirtex on

[root@localhost ~]# grep -e 'vmx' /proc/cpuinfo

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq monitor vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti tpr_shadow vnmi flexpriority vpid fsgsbase avx2 invpcid rdseed md_clear flush_l1d

[[root@localhost ~]# lsmod | grep kvm

kvm_intel             315392  0

kvm                   847872  1 kvm_intel

irqbypass              16384  1 kvm

Battery Health on CLI of CentOS8

    [root@master ~]# yum install upower

    [root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0

    [root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep percentage

    percentage:          12%

    [root@master ~]# vim .bashrc

    [root@master ~]# exec bash

    [root@master ~]# b

    percentage:          12%

Top 10 Reason For CCNA as a  
Best Career Option

1. Simplicity
I have experienced different technologies like Windows Server Administration, Linux
Administration, Virtualization Administration but I like computer networking (specially routing & switching) most as it is easy to grasp & it is well structured.
 
2. Credibility
There are lots of certification out there in the market like RHCSA, MCSA, JNCIA, but CCNA is well
known as it is there in market since long time. In IT industry it is well known, even if company
not using cisco product still they are in favors of employing candidate who has done CCNA. This I have experienced in my past companies where they were using technologies like juniper but for eligibility they put criteria as CCNA certified not JNCIA Certification.
 
3. Ease of training
Tons of material available on the internet specially YouTube if are planning study CCNA. You can get guidance from experienced network engineer, administrator, architect on various topics of
CCNA from your home itself. As these people share their experience over blog & YouTube.
You just need to invest your time in it.
 
4. Available resources
Books like Certification Guide written by top notch expert in the networking domain is available,
specially I like Wendell Odum’s book. CBTs of trainers who has explained it in very simple yet
practical manner. There are lots CBT(Computer Based Training) material available but I like CBTs
made by Live Lessons & CBT Nugget.
 
5. Awesome certification program
I did CCNA in two parts ICND1 in August 2012 & revised it after two months with ICND2. Then in
November 2015 I revised it with CCNP Route, Now I am planning to revise it by CCNP Switch in
next month. The point which I want to convey is that you have to be in touch with certification
program for at least within three years. So, you will be trying to attempt certification level by
level like Associate(CCNA), Professional(CCNP) & then Expert(CCIE). Always you will be
motivated & passionate to achieve more knowledge on networking domain. Further more you
will be rewarded with recognition, respect in industry & monetary benefits in terms of hike &
promotions.
 
6. Hands on
You can do hands on practice with tools like cisco packet tracer, GNS3 OR UNL. Since without
practice you can’t enjoy this technology. In addition to that, industry need working knowledge which we can achieve by practice labs. If you are willing to lab up on real device that can also be possible on refurbished hardware which cost very less.
 
7. Objective Technology instead of Subjective
Wires-cables, routers & switches you can touch & feel, so we need not have to assume things.
As compared to learning computer languages where most of things are logical or subjective.
 
8. Other emerging technology
CCNA CyberOps is an industry’s most demanded technology where we need SOC(Security
Operation Center) Analyst in millions of numbers that’s why cisco is sponsoring this certification
training & exam.
 
9. Lots of flavor to suit to your test
There are so many different technologies which are allied with CCNA Routing & Switching. Top
in the list is Security followed by Collaboration (Voice over IP & Video over IP), DATACENTER,
Wireless, Service Provider, CyberOps (information security).
 
10. Industry can accommodate you for their objective
As a beginner we can start with Routing & Switching and get the first job, afterword shifts your
focus on required technology as per your company demand & your interest. Further more in IT
industry, specially cisco partner willing to absorb certified people as they get discount from
CISCO on CISCO product because of number cisco certified engineer as an employee.
 

Samir Maniyar
CCNA, JNCIA, Paloalto ACE

CCP Demo for CCNA Security

http://www.cisco.com/c/en/us/products/cloud-systems-management/configuration-professional/presentation-listing.html

Joined NII Consulting

Joined NII Consulting Mumbai on 5th May 2014

As Cisco Trainer & Analyst

MPTA

I joined MPTA as IMS Trainer

Addresses on L2

Multicast addresses: Multicast addresses are used to allow a subset of devices on a
LAN to communicate. When IP multicasts over an Ethernet, the multicast MAC
addresses used by IP follow this format: 0100.5exx.xxxx, where any value can be used
in the last half of the address.

Open source tecnology

We trust in GOD, from anybody else we require source code.

CCNA Video in Hindi

http://www.youtube.com/playlist?list=PL3800FAC0F30CE3A6&feature=plpp

PSTN

RHEL Quota

LLMNR

WAN

NAT

Three Switch Function at Layer 2

Address learning: L2 switches & bridges remembers the source hardware address of each frame received on an interface & they enter this information into MAC address table.

Forward/filter decision: When frame is received on an interface, the switch looks at destination hardware address & find exit interface in the MAC table. The frame is only forwarded out the specified destination port.

Loop avoidance: If multiple connections between switches are created for redundancy, network loop can occur, then STP is used.

SFP

The small form-factor pluggable (SFP) or Mini-GBIC is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. It interfaces a network device mother board (for a switch, router, media converter or similar device) to a fiber optic or copper networking cable. It is a popular industry format jointly developed and supported by many network component vendors.^[1] SFP transceivers are designed to support SONET, Gigabit Ethernet, Fibre Channel, and other communications standards.

Quote

“Competition in [worldly] increase diverts you, until you visit the graveyards,” (Qur’an 102:1-2).

CISCO IOS VERSIONS

AES Encryption

http://www.cs.bc.edu/~straubin/cs381-05/blockciphers/rijndael_ingles2004.swf