One SIP @ a time – Communications

Without a proper plan, learning anything can take much longer than necessary and lead you down the proverbial “rabbit hole”. We are going to embark on a journey to learn different Information Technology topics geared towards the IT newbie with the hope of giving them sufficient information so that they can eventually become proficient enough to become subject matter experts in whichever topic they choose to focus on.

Without technology, simple things become very mundane and time consuming. When things become mundane, we tend to commit errors without ever noticing it (boredom). Technology has allowed us to become more efficient in our day-to-day tasks thereby freeing us to do the mundane things that we so enjoy.

I am going to write a couple of blog posts which will lay the foundation for the path to our journey into this wonderful thing called Information Technology.

The first three posts are:

  1. Communications
  2. Protocols
  3. Networking

Communications

Communication can be difficult without some sort of language, protocol, or means to convey your message.

Communication is what you (sender) use to convey your message (signal) to the recipient (receiver).

How does one communicate?

People, animals, and computers communicate in the same manner.

Throughout history, there has always been the need to create things.  Always striving to improve. Better. Faster. More effective. Communication is no different.

Communication Hardware

Hub – A device used for connecting multiple devices (computers or other hubs)

Signal – An electrical impulse or wave that is transmitted or received.

Bridge – A network bridge connects two segments of a network together. Its purpose is to divide a network into manageable sections.

Cable – A cable (Token Ring, Coaxial, Ethernet, Fiber Optic, etc.) is a piece of hardware used for transporting signals for communication purposes.

Router – A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet

Network switch on white background, isolated

Switch – A network switch is networking hardware that connects devices on a computer network by using packet switching to receive, and forward data to the destination device. A network switch is a multiport network bridge that uses media access control addresses to forward data at the data link layer of the OSI model.

Firewall – A firewall is a network security system that monitors, and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.

Next Generation Firewall – A next generation firewall includes the same functions as a traditional firewall such as network part address translation (NAT), packet filtering, stateful inspection and virtual private network (VPN) support. The goal of the NGFW is to include more layers of the OSI model.

Network Virtual Appliance – A network virtual appliance (NVA) is a pre-configured virtual machine image of either a next generation firewall or router that is ready to run on a hypervisor in a cloud environment (private/public/government cloud)

Open Systems Interconnection model – According to the Wikipedia definition: The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard communication protocols. The model partitions a communication system into abstraction layers. The original version of the model had seven layers.

Stay tuned for the second blog post in this series, we will dive in headfirst into the orderly chaos of network protocols.

One SIP @ a time – Communications

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