Cisco
IOS Modes
Sep 7th
The Cisco IOS command-line interface is organized around the idea of modes. You move in and out of several different modes while configuring a router, and which mode you are in determines what commands you can use. Each mode has a set of commands available in that mode, and some of these commands are only available in that mode. In any mode, typing a question mark will display a list of the commands available in that mode.
Router>?
Exec Mode
When you first connect to the router and provide the password (if it has been set up), you enter EXEC mode, the first mode in which you can issue commands from the command-line. From here you can use such unprivileged commands as
Router>show ?
Simple CLI Cisco Commands
Sep 7th
Here is a list of simple CLI commands to do basic commands on Cisco switches, routers and firewalls.
7-layer OSI Model
Aug 27th
For your CCNA Exam ( ICND1 and ICND2 ) you are going to need to know (inside and out) the OSI model which is the fundamentals of networking.
Under its official name, the Open Systems Interconnection Reference Model, or the OSI model, was developed by the International Organization for Standardization, which uses the abbreviation of ISO in 1984. And, yes, the full acronym of the OSI is ISO OSI.
The OSI model is a layered model that describes how information moves from an application program running on one networked computer to an application program running on another networked computer. In essence, the OSI model prescribes the steps to be used to transfer data over a transmission medium from one networked device to another. The OSI model is a seven-layer model developed around five specific design principles:
Switching – Store and forward, Cut-through and Fragment free
Apr 9th
Switching Modes
Switches examine the source and destination MAC in a frame to build their MAC table and make their forwarding decision. Exactly how they do that is the topic of this section. You need to be aware of three switching modes: Store and Forward, Cut Through, and Fragment Free.
Storing Cisco Config files
Mar 29th
When you configure a Cisco device it needs to store and run a configuration file. The list below details the four main types of memory found in a Cisco switch as well as the most common use of each type
- ROM stands for Read-Only Memory. ROM stores the router’s bootstrap startup program, operating system software, and power-on diagnostic test programs (the POST).
