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What is the Difference Between Bridges, Hubs, and Switches?

Article | Aug. 14, 2012

The most obvious difference is that hubs operate at Layer 1 of the OSI model while bridges and switches work with MAC addresses at Layer 2 of the OSI model. Hubs are really just multi-port repeaters. They ignore the content of an Ethernet frame and simply resend every frame they receive out every interface on the hub. The challenge is that the Ethernet frames will show up at every device attached to a hub instead of just the intended destination (a security gap), and inbound frames often collide with outbound frames (a performance issue).

What is the Cisco UCS Manager?

Article | Feb. 01, 2012

The Cisco UCS is truly a “unified” architecture that integrates three major datacenter technologies into a single, coherent system: Computing Network Storage Instead of being simply the next generation of blade servers, the Cisco UCS is an innova­tive architecture designed from scratch to be highly scalable, efficient, and powerful with one-third less infrastructure than traditional blade servers.

What Happens If I Have More Than One Switch With Redundant Links?

Article | Oct. 11, 2012

That depends on their configurations. For example: While it makes very good sense to include redundant physical links in a network, connecting switches in loops, without taking the appropriate measures, will cause havoc on a network. Without the correct measures, a switch floods broadcast frames out all of its ports, causing serious problems for the network devices. The main problem is a broadcast storm where broadcast frames are flooded through every switch until all available bandwidth is used and all network devices have more inbound frames than they can process.

What DMVPN Is and Why We Should Care

Article | April 03, 2014

According to Cisco marketing, Dynamic Multipoint VPN (DMVPN) “will lower capital and operation expenses, simplifies branch communications, reduces deployment complexity, and improves business resiliency.” Okay. But what is it, really, and why should we care?

What’s the Value of an AWS Certification?

Article | Feb. 03, 2015

Our IT Skills & Salary Survey revealed the average AWS certified salary was over 100k - how's that for AWS certification value? Read on for more!

What’s the Difference Between Hubs, Switches & Bridges?

Article | July 30, 2017

The key difference between hubs, switches and bridges is that hubs operate at Layer 1 of the OSI model, while bridges and switches work with MAC addresses at Layer 2 of the OSI model.

What is Software-Defined Networking?

Article | Jan. 15, 2019

Software-defined networking (SDN) is a solution that will enable your organization to meet the demands of network programmability and automation. The result will be greater network agility to support new applications while complying with increasing security needs.

What is Cloud Computing with Amazon Web Services?

Video | Sep. 01, 2015

Learn about Cloud Computing with AWS and the benefits AWS provides to hundreds of thousands of customers globally.

What is Cisco Unity, Unity Connection & Unity Express?

Video | March 14, 2013

Global Knowledge Course Director and Lab Topology Architect Joey DeWiele, a specialist in Unified Communications, discusses Cisco Unity, Unity Connection & Unity Express.

What is Amazon Web Services?

Video | Sep. 01, 2015

Learn about the Amazon Web Services platform, products, and services. Gain on-demand access to compute, storage, and database services without upfront costs.