Apr 29, 2011

Subneting a class C address *** THE FAST WAY! ***

You need to do is answer five simple questions:
  1. How many subnets does the chosen subnet mask produce?
  2. How many valid hosts per subnet are available?
  3. What are the valid subnets?
  4. what's the broad cast address of each subnet?
  5. what are the valid hosts in each subnet?
well ...

Apr 24, 2011

LAN & WAN Interface Descriptions

  • LAN Interface Descriptions:

Atlanta (Router`s name) (config)# int e0
Atlanta (config-if)# description sales lan
Atlanta (config)# int e1
Atlanta (config-if)# description marketing lan

  • WAN Interface Descriptions

Titanic (Router`s name) (config-if) int e1
Titanic (config-if)# desc wan to maimai circuit: anythings!

Router Interface Configuration

* IP addresses  *Media Type  * Bandwidth  * Other administrative commands

Cisco 2522
  • Cisco 2522 has 10 serial:  
Router (config)# int Serial?
<0-9> serial interface number

The 2522 router has one Ethernet 10baset port; Router (config)# int ethernet ?
<0-0> Ethernet interface number
Router (config)# int ethernet 0
Router (config-if)#

Apr 23, 2011

the Router

Connecting to the Router
We have three ways:
  1. Auxiliary Port / Phone line 
  2. Console Port / Rj-45 / Console Cable or Console cable-rollover
  3. Telnet /  (USER MODE) ip net - 10Baset t
Cisco Router Components 
  1. Bootstrap: boot the router & then load the IOS.    [Microcode of the Rom]
  2. POST (Power On Self Test): check the basic functionality of the router hard ware.    [Microcode of the Rom]
  3. Rom monitor: testing & troubleshooting.    [Microcode of the Rom]
  4. Mini-IOS (Rx-boot / boot-loader): small IOS in Rom. load a Cisco IOS into flash memory.
  5. RAM:  hold packet buffers, ARP cache, routing table.
  6. ROM: star & main tent the router.
  7. Flash memory: hold the Cisco IOS, NOT erased when the routers is reloaded, it is EEPROM.
  8. NVRAM: hold the router & switch configuration.
Cisco Router 
  • Basic IOS: ROM
  • Boot strap: ROM
  • Diagnestics: ROM
  • Current IOS: Flash
  • Start up configuration: NVRAM
  • Running configuration: RAM

Types of IP addresses

Types of addresses are:   1-Unicast  2-Multicast  3-Broadcast   

                   First Network ID            Last Network ID
Class A                  
Class B                is Loop Back
Class C           

Apr 22, 2011

OSI Layers

1. Physical
2. Data link
3. Network
4. Transmission
5. Session
6. Presentation
7. Application

Apr 21, 2011

First post!

This blog will continue till i take CCIE & prove my language!