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Layer 1 2 3 and 4 Switching
Internetwork Switching Methods In telecommunications terminology, a switch is a device that forwards incoming data from any of multiple input ports to a specific output port that will take the data toward its destination. Although the most common form of switching is Layer 2 switching, it is important to know that switching can also be…
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How to Redundancy Proof Your IT Career
I'll never forget the day I was working at Cisco, and I looked out to the car park and saw the guy who was my bosses, bosses boss walking towards our office. Next to him was the head of HR. I knew they hadn't come to thank us all for our hard work. They told…
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Optical Networking
Optical Networking Various optical link technologies are used in large enterprise infrastructures to assure some kind of connectivity. Some of the optical networking techniques include SONET/SDH, CWDM, DWDM, and RPR. We cover many networking technologies in our CompTIA Network+ certification course. Synchronous Optical Network and Synchronous Digital Hierarchy Synchronous Optical Network (SONET) and Synchronous Digital…
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Routing Protocol Metrics
Routing Protocol Metrics Routing protocol algorithms use metrics, which are numerical values that are associated with specific routes. These values are used to prioritize or prefer routes learned by the routing protocol from the most preferred to the least preferred. In essence, the lower the route metric, the more preferred the route by the routing…
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InterVLAN Routing Explained
InterVLAN Routing By default, although VLANs can span the entire Layer 2 switched network, hosts in one VLAN cannot communicate directly with hosts in another VLAN. In order to do so, traffic must be routed between the different VLANs. This is referred to as interVLAN routing. The three methods of implementing interVLAN routing in switched…
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