The IOS supports a variety of data link layer technologies for the LAN and WAN environments, including copper and fiber wiring as well as wireless.
The IOS supports both fixed and modular chassis platforms, enabling you to purchase the appropriate hardware for your needs, yet still allowing you to leverage the same IOS CLI to reduce your management costs.
To ensure that your critical resources are always reachable, Cisco has developed many products and IOS features to provide network redundancy.
With the IOS, you can strictly control access to your network and networking devices in accordance with your internal security policies.
c1841-advipservicesk9-mz.124-6.T7.bin ( this name is used to expalation)
An IOS filename is broken down into four parts:
Image runs in flash
Image runs in Random Access Memory (RAM)
Image runs in Read Only Memory (ROM)
Image will be relocated at runtime
Image is Zip compressed
Image is Mzip compressed
Image is Stac compressed
Cisco's networking products support two types of external connections:
ports (referred to as lines) and interfaces.
Out-of-band management (which you do by console ports) does not affect the bandwidth flowing through your network, while in-band management(which is doen by interface) does
Almost every Cisco product has a console port. This port is used to establish an out of- band connection in order to access the CLI to manage your Cisco device. Most console connections to Cisco devices require an RJ-45 rollover cable and an RJ-45-to-DB9 terminal adapter.
The rollover cable pins are reversed on the two sides.
|Com port setting|
|Parity & Flow Control||None|
A straight-through cable is used for DTE-to-DCE connections.
Crossover cables should by used when you connect a DTE to another DTE or a DCE to another DCE.
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