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NAT-(NETWORK ADDRESS TRANSLATION)

NETWORK ADDRESS TRANSLATION Types of NAT 1-Static 2-Dyanamic 3-PAT(Port Address Translation) 1-Static Router(config)#ip nat inside source static 10.0.0.2 20.0.0.10 Router(config)#ip nat inside source static 10.0.0.3 20.0.0.11 Router(config)#int fa0/0 Router(config)#ip access Router(config)ip nat in Router(config)#exit Router(config)#int s0/0/0 Router(config)ip nat outside Router(config)#exit For Remove Router(config)#no ip nat inside source static 10.0.0.2 20.0.0.10 Router(config)#no ip nat inside source 10.0.0.3 20.0.0.11 2-Dyanamic Router(config)#ip nat pool abc 20.0.0.40 20.0.0.50 netmask 255.0.0.0 Router(config)#ip nat inside source list 1 pool abc Router(config)#Access-list 1 permit 10.0.0.0  0.255..255.255 Router(config)#int fa0/0 Router(config)#int nat in Router(config)#exit Router(config)#int s0/0/0 Router(config)#ip nat outside Router(config)#exit To Remove NAT Router(config)#int fa0/0 Router(config)#no ip nat in Router(config-i...
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ACL(ACCESS CONTROL LIST)

List of conditions:- TYPES:- 1-Standard:1-99 2-Extended:100-199 1-Standard                   -Require source IP add.                   -Apply on destination router.                   -Out band List 2-Extended                   -Require source IP & destination IP.                   -Apply on source Router.                   -Inbound List. ICMP-Internet control Message Protocol Router(config)#access-list 4 deny 30.0.0.3 Router(config)#access-list 4 permit any Ro...
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BASIC COMMAND OF ROUTER

User Mode--Router>Enable(En) Previllage Mode-Router#Conf t,show,copy,ping,Telnet Global mode-Router(conf)#hostname R1 Router>En Router#conf t Router(config)hostnameR1 R1(config)# R1(config)#int f0/0 R1(config)#ip add 10.0.0.1 255.0.0.0 R1(config-if)#no shutdown R1(config-if)#exit R1(config)#int s0//0/0 R1(config)#ip add 20.0.0.1 255.0.0.0 R1(config-if)#clockrate 64000 R1(config)#no shutdown STATIC ROUTING R1(conf)#i route<Destination N/W><subnet Mask><first hop> R1(conf)#ip route 30.0.0.0255.0.0.0 20.0.0.2               #ip route 40.0.0.0 255.0.0.0 20.0.0.2               #ip route 50.0.0.0 255.0.0.0  20.0.0.2 R2(conf)#ip route 10.0.0.0 255.0.0.0 20.0.0.1               # ip route 50.0.0.0 255.0.0.0 40.0.0.2 R3(conf)#ip route 30.0.0.0 255.0.0.0 40.0.0.1   ...
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IP ADDRESSING

CLASS A-[0-126] CLASS B-[128-191] CLASS C-[192-223] CLASS D-[224-239]-For Broadcasting CLASS E-[240-255]-Reserve for future planing. 127.0.0.1-It is called as a look back IP address.It is called check self.
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DIFFERENT MEMORIES OF ROUTER

1-RAM 2-ROM(Post,Boot Strap,Mini ios,Rom-Monitor) 3-Flash Memory 4-NVRAM 5-Config-Register value 1-RAM:-RAM is used to  load the IOS from flash memory,IOS is stored in flash memory in compressed form,During the booting process of Router the IOS is compressed and loaded of Router the IOS is compressed loaded in RAM. RAM is working memory of Router. 2-ROM:-    POST(Power on Self Test):-It checks weather all devices getting proper power ON or Not?    BOOT STRAP:-It helps to find and load device configuration file and IOS of Router.    MINI-IOS:-The Mini-Ios component is not present in every Router.The Mini-Ios components    provides an alternet file for Route boot up.If the Existing image files is unavailable.     ROM-MONITOR:- ROM-MONITOR is a program stored in the RAM which is used to debug user program.                 The ROM Mon...
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BASIC COMPONENT OF ROUTER

1-CONSOLE PORT:-It  is used to configure the Router using desktop or Laptop.Router and computer are connected using special cable is called Role over cable.Role over cable and console are one side RJ45 and other side 9 pin connector. 2-AUXILARY PORT:-This port is used for remoting configure Router using modem or telephone line. 3-VTY:-With the help of this port we can have remote login for that purpose VTY port password and Router password must be same. 4-LAN CONNECTION:-Fast Ethernet port is used for high internet connection,which operates as speed of 100MBPS. 5-SERIAL INTERFACE:-Serial port of Router is used for connecting wide Area Network and connecting Router to Router connection.
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OSI MODEL

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OPEN SYSTEM INTERCONNECTION MODEL 1-PHYSICAL LAYER 2-DATALINK LAYER 2-NETWORK LAYER 4-TRANPORT LAYER 5-SESSION LAYER 6-PRESHeader and ENTATION LAYER 7-APPLICATION LAYER   1-PHYSICAL LAYER:-Physical Layer is first layer of OSI Model,It is used to established and terminate connection. 2-DATALINK LAYER-In this layer Header and Trailer is added to the data ,Header contains source MAC Address and destination address. Trailer contains FCS(frame Check sequence) 3-NETWORK LAYER:-Network layer adds to data to Header that Includes only IP address of source and destination. 4-TRANSPORT LAYER:-To deliver the packet to correct process.(Service point addressing) 5-SESSION LAYER:-This layer established synchronize manages and terminates to the connection and session between two commuters. 6-PRESENTATION LAYER:-The presentation layer established context between application layer entries,In which the application layer entries may be different syntax and semantics. 7-APPL...
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