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Now that the network is installed, each switch has a bridge ID number, and the root switch has been elected, the next step is for each switch to perform a calculation to determine the best link to the root switch. Each switch will do this by comparing the path cost for each link based on the speed. For paths that go through one or more other switches, the link costs are added. The switch compares this aggregate value to the other link costs to determine the best path to the root switch.

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.

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?

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.

The bad guys just keep getting better! No matter how much patching and tweaking we do, the bad guys' constantly changing tactics and techniques continue harming our networks, stealing and damaging data, and just generally screw things up. What motivates someone to do such terrible things in the first place? How have these hackers changed and improved? What kinds of attacks are popular now and why? In this hour-long webinar, security expert, former hacker and Global Knowledge instructor Phillip D. Shade will provide insight into understanding the latest hacking techniques, what the current threat landscape looks like, and suggested countermeasures to mitigate threats. He will include specific examples of the current threat landscape, including data mining, social engineering cyber threat terminology, man-in-the- middle attacks and Denial of Service (DoS) attacks.

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.

Networks are under attack as hackers try to access systems to compromise or steal sensitive data and information. Understand the threats posed by malware, ransomware and social engineering.

Driven by recent increases in cryptocurrency values, Cryptojacking is poised to be the center of conversation in 2018. It’s one of the latest innovations in hacking in which a victim’s computer is enlisted to mine cryptocurrency. Unlike ransomware, this attack steals processor cycles in an attempt to mine Monero and other currencies, typically without the user’s knowledge or consent. Watch this timely 1-hour webinar where we will discuss – A quick overview of cryptocurrencies. A walk-through of a typical attack. The economics of the attackers. Possible mitigation strategies to keep you and your organization safe. With miners trying to take advantage of the rising cryptocurrency industry, join us as we investigate this cyber-crime and learn how you can protect yourself and your organization. View our complete Cybersecurity curriculum for courses that help you build fundamental to advanced cybersecurity techniques, prepare for top industry-recognized certifications or master product-specific skills.

Cloud and virtualization technologies have spawned a whole ecosystem of applications. But like any powerful technology, they can be used for bad as well as good. This session reviews the top 10 most common mistakes made in cloud and virtualization security.

Cyber resilience is becoming a bigger issue for all organizations. But what does “good cyber resilience” look like? And how do you get there?