Tuesday, July 17, 2012

Network hardware what does it do?





Repeater, repeater, repeater...


If your looking to become a network administrator then having a sound foundation is key. A good start to a strong foundation is knowing your hardware. The first question I seem to get is what is the difference between a hub, repeater and switch? A repeater does exactly what its name says. A repeater does exactly what its name says lol. It repeats any electrical signals that come into one port or out its other port. This 
is not the smartest device but it served its purpose.


Hub a bub bub


A hub is typically the least expensive, least intelligent, and least complicated of the three. Its job is pretty simple: anything that comes in one port is sent out to the others. Every computer connected to the hub "sees" everything that every other computer on the hub sees. The hub itself is ignorant of the data being transmitted. For years, simple hubs have been quick and easy ways to connect computers in small networks. The Hub and repeater both work at the Physical layer of the OSI Model, Layer 1.


Switch it up!

Pretty straight forward right? Now time for the very intelligent switch. A switch does essentially what a hub does but more efficiently. How does it do this? By paying attention to the traffic that comes across it, it can "learn" where MAC addresses are. For example, if it sees traffic from computer A coming in on port 2, it now knows that computer A is connected to that port and that traffic to computer A needs to only be sent to that port and not any of the others. The net result of using a switch over a hub is that most of the network traffic only goes where it needs to rather than to every port. On busy networks this can make the network significantly faster and prevent broadcast storms. Another note is that the switch works at the Data-Link layer of the OSI Model, Layer 2.

There are many resources out there to help increase your skill set and knowledge. At Asher College you can get hands on experience attending their Network Clinic. This clinic covers many facets of building a network from scratch all the way up to managing clients. 



CompTIA Network+ certification is the sign of a qualified networking professional.

CompTIA A+ certification validates foundation-level knowledge and skills necessary for a career in IT support. It is the starting point for a career. The international, vendor-neutral certification proves competence in areas such as installation, preventative maintenance, networking, security and troubleshooting. 

CompTIA Security+ certification designates knowledgeable professionals in the field of security, one of the fastest-growing fields in IT. CompTIA Security+ is an international, vendor-neutral certification that demonstrates competency in Network security, compliance and operational security, threats and vulnerabilities and application, data and host security.
For more information about an exciting career in Information Technology please contact Asher College!




Check out this Article About Microsoft Certifications 




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