Among all of the essentials for human existence, the need to interact with others has become a need in our daily life. Communicating with one another has become a essential need. In today’s society, through the use of networks, we are connected like never before. People can now share ideas, photography, videos and chat with each other instantly. News what once took days to weeks to reach us is now available to us in seconds. Individuals can now connect with family members and friend separated by oceans.
One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man.
What is a Network?
Networks come in all sizes. A network can be a simple two computers or as large as millions of devices.
- Home Networks- Typically connects a few computers to one another and the internet.
- Small Office/Home Office Network- A HOHO network enables computers to connect to a companies network to access shared resources.
- Medium to Large Networks- Such as schools and companies, can have multiple locations with hundreds or thousands of interconnected computers.
- World Wide Networks- The internet is made up of millions of computers connected world-wide.
What is a Network made up of?
The network infrastructure is made up of three categories.
- Devices- These are your end devices such as desktops and laptops.
- Intermediary Network Devices- There devices connect the end devices to the network. Such devices are wireless routers, LAN switches, Routers, and Firewall Appliances.
- Network Media- In order for communication to reach the network a media is required. Modern networks are made up off three types of media.
- Metallic Wires Within Cables- Encodes data into electrical impulses.
- Fiber (Glass or Plastic)- Encodes data into light impulses.
- Wireless- Encodes data into wavelengths.
Important terms to remember for your CCNA exam.
- Network Interface Card- A NIC provides physical connection to the network.
- Physical Port- Is a connector connecting two devices. (End device to Switch)
- Interface- The ports on the router or switch are know as interface.
A Network has two types of topology
A topology is a visual map of how the network is connected.
- Physical Topology- Diagram of where the physical intermediary devices and cables are located.
- Logical Topology- Shows devices, ports, and addressing