Inside the router's chassis.
Cisco router memory has over 120 gigabytes. That is a lot of memory for a router. This item can be found on either eBay or Amazon for a very cheap price.
There are three major parts of the router that can be upgraded:DRAM memory, Flash Memory, and the IOS operating system that runs on it.DRAM and Flash can each be a maximum of 16 MB (try ebaying for cisco 2500 flash or memory), and IOS images can be downloaded from Cisco if you have a valid Cisco service contract.
Flash Memory
Ram
whenever you log into your cisco router....
The Security device manager is stored in the Router's Flash Memory
One can upgrade the memory of a Cisco router by purchasing the correct part to do so and doing it oneself. This solution is not recommended to those who do not feel technically competent with regards to the inside of a computer. Another option would be to buy the part and have a computer geek do the upgrade for one.
Some recommended books about Cisco routers are: Cisco Router Configuration, Cisco Routers For The Desperate, Cisco Routers for IP Router, Cisco CCNA Routing and Switching.
TFTP server, Flash
HDLC
The Cisco 2801 2-Port 10/100 Wired Router was released in the year 2004. You can find the Cisco 2801 router for sale used on eBay starting at $485.00.
It routes things... lol If you have a cable internet connection for instance, the cable company gives you a cable modem that connects to the cable jack in the wall. To split this signal amongst multiple computers you need a router. The router plugs right into the modem and the computers plug into the router. The router then will devide the internet signal between the computers.