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July 19, 2013


Cisco is NETWORKING based company. You MUST have at least the minimum knowledge, and taste of network with you. You can also get CCNA,and CCNP degrees from Cisco..
In the following post. I do my best to transfer to main important concepts

Part 1: Introduction to networking:

Modems : This is the very first device between your equipment that connect your computers to the internet cloud.[DSL or Digital Subscriber Line(12Mbps is the Maximum of this technology, Asynchronous and download is faster than upload, and speed is always fix), T1, T2,T3, cable, fiber optic,comcast modems]

Routers: behind the modem, there is device called router, and it responsible for routing data in the network

Firewalls: underneath the router, firewall exists to protect your device from hackers

Switches: is located under firewall as the spliter of internet signal : HUBs was old concept of Switches. JUST trow them in garbage. Hub has no intelligent and basically split internet between users and it causes problem, but Switches knows how to transfer data. Switches may have different ports from 4 to hundred, thousands. We have managed and un-managed switch. Manage version allows you to go into the switch and program to do certain things like quality of the service.. 10Mbps[old days]/100Mbps[nowadays]/ 1000Mbps [latest technology]

Wireless Access Points: will allow wireless devices, and computers to connect to your network. standards are 802.11 family [a[old and nobody use them nowadays, and is not compatible with other standard], b[11Mbps],g,n[allows much larger area to cover, faster, suitable for VOIP],ac]


Defines Logical and Physical: [Not necessary the same concepts]. For example physically you may have one device including modem+ router + firewall + Switch but logically they for devices. Even you may connect your computer to a switch share with other computer but you not logically connected to the same network

Speed :first of all b=bit and B=Byte and the you should know that speed  is measured in bps means bit per second 

VPN:  Virtual Private Network.: Somebody out of physical network becomes a member of your internal network

Cabling : jack-patch panel

Clients, Devices and Servers: Everything on the network is called network device, Server:is a network device that provide something for the rest of the network, Clients: is a network device that receives ar service from service

Part 2: Understanding broadband technologies



From → Cisco

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