Know the Functions & Uses Part of a Cisco Router

Who does not know this one system device, he is Cisco. Cisco routers function as a link between two or more networks to forward data from one network to another. Routers have parts similar to PCs. Let’s see what the parts of a Cisco router are:

1. RAM

The main functions of RAM on the router are storing the current configuration (running configuration) and the active IOS operating system, storing the routing table, handling the ARP cache, handling fast-swtiching cache, providing temporary memory for file configuration, handling packet buffers, managing packet queues. The nature of RAM is that all stored data will be lost when losing resources or when it will restart.

2. NVRAM (Non Volatile RAM)

NVRAM is useful for storing start-up (start-up configuration) configurations. The contents will remain even if the router loses power.


Flash is useful for storing IOS (Operating System Image). This memory can store various IOS software versions. It is a type of EEPROM (Electronically Erasable Programmable ROM), so even if the router loses power, the contents remain.

4. ROM

ROM is useful for storing the bootstrap system which functions to manage the process and run the Power On Self Test (POST) and IOS Image.


The interface is an external component of a router. Before configuring the router, each component’s function must be known in advance because the components to be connected to the router use different interfaces depending on the component to be connected. The picture above shows the standard interface that is owned by a router which includes:

Serial Ports, consisting of Serial0 and Serial1

Fast Ethernet Ports, you know everything

Console Port, port to connect the router to the outside world, this port will connect to the serial port on our PC using a Roll Over cable

Auxiliary Port, almost the same as the Console Port, and not all of these ports are owned by the router

Power Switch, for power

How can we connect to the router? We can choose the alternatives below, namely through:

Console Port

Aux port

Telnet (Ethernet or Serial Port)

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