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Network | NetSwitching

Putty_Serial

Putty_Telnet

Putty_SSH

Telnet/SSH

Secure Usermode with password | Show Command
show run | show login failure | show users

Full Console Security
show run | show login failure | show users

TFTP Flash
show flash:

Copy startup-config to TFTP

Copy From TFTP to startup-config

Memories | show memory
show memory ?

RAM(EEPROM)---running-config
Main Processor Memory, and Shared I/O Memory
Main Processor Memory is where the routing table, ARP tables, and running configuration are stored.
Shared I/O Memory is used as a buffer location for temporarily storing packets prior to processing.

ROM(Read Only Memory)---bootrap
Power-on Self-Test (POST).
When the router is powered up, microcode stored in ROM performs a POST sequence.
This is used to ensure that elements such as the CPU, memory, and
interfaces are capable of functioning correctly.
Bootstrap Program.
The bootstrap program is used to initialize the CPU and boot functions of the router.
The bootstrap program is responsible for locating and loading the router’s IOS.
ROM Monitor.
A special diagnostic environment used for the purpose of troubleshooting or special configuration.
For example, this mode can be used to transfer an IOSimage over a console connection.
RxBoot.
When a valid IOS image cannot be found in Flash or on a TFTP server, this limited IOS version is loaded
for the purpose of installing a new IOS image into Flash. It is also sometimes referred to as the boot loader, boot
image, or helper image. The command set provided is only a subset of normal IOS commands.

NVRAM(Non Volatile Random Access Memory)
Startup-config
NVRAM is a relatively tiny 32KB in size.

Flash()
two Single Inline Memory Module (SIMM) slots that hold erasable programmable read-only memory (EPROM).
Flash memory is used to store and run the Cisco IOS software – the router’s operating system.

Exec Command(1) | Exec Command(2) | Exec Command(3)

Exec commands(1)pdf:

access-enable	Create a temporary Access-List entry
access-profile	Apply user-profile to interface
clear	Reset functions
connect	Open a terminal connection
crypto	Encryption related commands.
disable	Turn off privileged commands
disconnect	Disconnect an existing network connection
emm	Turn on privileged commands
enable	Run a configured Menu System
ethernet	Ethernet parameters
exit	Exit from the EXEC
help	Description of the interactive help system
ips	Intrusion Prevention System
lat	Open a lat connection
lig	LISP Internet Groper

Exec commands(2)pdf:

lock	Lock the terminal
login	Log in as a particular user
logout	Exit from the EXEC
modemui	Start a modem-like user interface
mrinfo	Request neighbor and version information from a multicast router
mstat	Show statistics after multiple multicast traceroute
mtrace	Trace reverse multicast path from destination to source
name-connection	Name an existing network connection
pad	Open a X.29 PAD connection
ping	Send echo messages
ppp	Start IETF Point-to-Point Protocol (PPP)
radius	radius exec commands
release	Release a resource
renew	Renew a resource
resume	Resume an active network connection
rlogin	an rlogin connection

Exec commands(3)pdf:

set	Set system parameter (not config)
show	Show running system information
slip	Start Serial-line IP (SLIP)
ssh	Open a secure shell client connection
systat	Display information about terminal lines
tclquit	Quit Tool Command Language shell
telnet	Open a telnet connection
terminal	Set terminal line parameters
tn3270	Open a tn3270 connection
traceroute	Trace route to destination
trm	Trend Registration Module
tunnel	Open a tunnel connection
udptn	Open an udptn connection
where	List active connections
x28	Become an X.28 PAD
x3	Set X.3 parameters on PAD

Enable Command(1)pdf: | Enable Command(2)pdf: | Enable Command(3)pdf: | Enable Command(4)pdf:
Enable Command(5)pdf: Enable Command(6)pdf:

Enable Mode commands(1):

access-enable	Create a temporary Access-List entry
access-profile	Apply user-profile to interface
access-template	Create a temporary Access-List entry
alps	ALPS exec commands
archive	manage archive files
auto	Exec level Automation
beep	Blocks Extensible Exchange Protocol commands
bfe	For manual emergency modes setting
calendar	Manage the hardware calendar
call-home	call-Home commands
cd	Change current directory
clear	Reset functions
clock	Manage the system clock
cns	CNS agents
configure	Enter configuration mode
connect	Open a terminal connection
copy	Copy from one file to another
crypto	Encryption related commands.
dcm	Data Collection Manager
debug	Debugging functions (see also 'undebug')

Enable Mode commands(2)pdf:

delete	Delete a file
dir	List files on a filesystem
disable	Turn off privileged commands
disconnect	Disconnect an existing network connection
dot1x	IEEE 802.1X Exec Commands
emm	Run a configured Menu System
enable	Turn on privileged commands
eou	EAPoUDP
erase	Erase a filesystem
ethernet	Ethernet parameters
event	Event related commands
exit	Exit from the EXEC
format	Format a filesystem
fpm	fpm configuration:
fsck	Fsck a filesystem
help	Description of the interactive help system
if-mgr	IF-MGR operations
ips	Intrusion Prevention System
isdn	Run an ISDN EXEC command on an ISDN interface
lat	Open a lat connection

Enable Mode commands(3)pdf:

license	License information
lig	LISP Internet Groper
lock	Lock the terminal
logging	Handles logging operations
login	Log in as a particular user
logout	Exit from the EXEC
mediatrace	Mediatrace Commands
microcode	microcode commands
mkdir	Create new directory
modemui	Start a modem-like user interf
monitor	Monitoring different system events
more	Display the contents of a file
mpls	MPLS commands
mrinfo	Request neighbor and version information from a multicast router
mrm	IP Multicast Routing Monitor Test
mstat	Show statistics after multiple multicast traceroutes
mtrace	Trace reverse multicast path from destination to source
name-connection	Name an existing network connection
ncia	Start/Stop NCIA Server
no	Disable debugging functions

Enable Mode commands(4)pdf:

pad	Open a X.29 PAD connection
partition	Partition disk
ping	Send echo messages
ppp	Start IETF Point-to-Point Protocol (PPP)
pwd	Display current working directory
radius	radius exec commands
redundancy	Redundancy Facility (RF) exec commands
release	Release a resource
reload	Halt and perform a cold restart
rename	Rename a file
renew	Renew a resource
restart	Restart Connection
resume	Resume an active network connection
rlogin	Open an rlogin connection
rmdir	Remove existing directory
rsh	Execute a remote command
sdlc	Send SDLC test frames
send	Send a message to other tty lines
set	Set system parameter (not config)
setup	Run the SETUP command facility
show	Show running system information

Enable Mode commands(5)pdf:

slip	Start Serial-line IP (SLIP)
spec-file	format spec file commands
ssh	Open a secure shell client connection
start-chat	Start a chat-script on a line
systat	Display information about terminal lines
tarp	TARP (Target ID Resolution Protocol) commands
tclquit	Quit Tool Command Language shell
tclsh	Tool Command Language shell
telnet	Open a telnet connection
terminal	Set terminal line parameters
test	Test subsystems, memory, and interfaces
tn3270	Open a tn3270 connection
traceroute	Trace route to destination
trm	Trend Registration Module
tunnel	Open a tunnel connection
udptn	Open an udptn connection
undebug	Disable debugging functions (see also 'debug')
upgrade	Upgrade commands
verify	Verify a file
vlan	Configure VLAN parameters

Enable Mode commands(6)pdf:

vlan	Configure VLAN parameters
vtp	Configure global VTP state
webvpn	WebVPN exec command
where	List active connections
which-route	Do OSI route table lookup and display results
write	Write running configuration to memory, network, or terminal
x28	Become an X.28 PAD
x3	Set X.3 parameters on PAD
xconnect	Xconnect EXEC commands