Cisco IOS

Cisco IOS (Internetwork Operating System) is a restrictive working framework that keeps running on most Cisco Systems switches and switches. The center capacity of Cisco IOS is to empower information correspondences between system hubs. Notwithstanding directing and exchanging, Cisco IOS offers many extra administrations that a manager can use to enhance the execution and security of system activity.


1. Cisco Router Architecture


1.1 Block Diagram



1.2 Architectural Components of a Router


1.2.1 Processor


The CPU utilized here is ordinarily Motorola 68030 CISC. Coming up next are the imperative attributes of the CPU.

32-bit transport, 20 MHz clocks (25 MHz on a few stages).

256 Bytes inside Data Cache, 256 Bytes inward Instruction Cache, both direct mapped.


1.2.2 System Control Logic


Framework Control Logic is utilized to assist the principal processor with gadget control, intrude on taking care of, tallying and timing, information exchange, insignificant First In, First Out (FIFO) buffering, and correspondence with system interfaces and Dynamic RAM (DRAM).


1.2.3 Busses


CPU utilizes Busses to get to different parts of the framework. Also, Busses are utilized to exchange directions and information to or from indicated memory addresses.

CPU Bus: It is utilized for fast activities with direct Processor get to.

Framework Bus: This permits correspondence with Ethernet/Token Ring controllers, WAN port interfaces, et cetera.


1.2.4 Dual UART


Double Universal Asynchronous Receiver-Transmitter (UART) gives the vital UI. It has one RS232 port, Data Communications Equipment (DCE) (for Console port) RJ45, and Data Terminal Equipment (DTE) (for Auxiliary port) RJ45.