Note: You should read about Content Addressable Memory (CAM) before reading this post. Today’s networking hardware operates a Layer 2, Layer 3 and Layer 4 of the OSI model. The device might switch Ethernet frames, route IP packets and implement filters based on the TCP segments. A MAC Address is always an exact match and […]
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Binary CAM performs a binary lookup ands returns either a 1 or 0.
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Content-addressable memory (CAM) is silicon chip architecture that is purpose-built for extremely fast but very specific type of memory lookups.
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VirtualBox is an open-source virtual machine manager and hypervisor that may also be used as a network emulator. In addition to creating and managing individual virtual machines, VirtualBox can connect virtual machines together to emulate a network of computers and network appliances such as routers or servers. VirtualBox works on the major computing platforms: Windows, MacOS, and Linux.
In this post, I offer a step-by-step tutorial showing how to use the VirtualBox graphical user interface to set up a network of six devices — three routers and three PCs. This tutorial will utilize some of the advanced functions supported by VirtualBox and provide you with the skills to set up a network of virtual machines on your own personal computer.
I assume you, the reader, are already familiar with the VirtualBox GUI and have used it to create and run virtual machines on your personal computer, using default settings. I also assume you have a basic understanding of Linux shell commands, which will be needed to configure the Linux operating system running on the virtual routers and PCs.
If you need to refresh your knowledge about VirtualBox, the VirtualBox website provides a detailed user manual, and Continue reading
Mobile Broadband… You might have heard this term before, possibly in an ISP environment. The term has always represented a name of a department within a mobile operator or a vendor organization. It is always there in profile description for telecom professionals. It is everywhere actually when it comes to a certain ecosystem or framework that delivers Internet Service […]
The post Mobile Broadband Ecosystem appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
Microsoft tried to buy Docker, MPLS team members resign from Cisco, and more.
There are big differences between hyperconverged systems and the web-scale architectures used by Google and Facebook.
Metal heads have nothing over data center managers.
One cool feature added with Firepower version 6 is probably best described as DNS-based Security Intelligence, Inspection and Sinkholing. The thought is pretty simple. If a host issues a DNS request for a host that is known to be malicious, that response is manipulated. The manipulated response can be host not found, an alternative IP address or no response at all. This allows an administrator to provide another layer of protection by preventing hosts ready access to the IP addresses of known malicious hosts.
So the first question that might come to mind is how are hosts on the Internet classified as bad. The short answer is that Talos maintains lists of known bad fully qualified domain names (fqdn). These are actually categorized and delivered into the Firepower solution as a feed. Each of the following category can be selected into one or multiple DNS Rules.
In addition to the above, there are two built in lists that can be controlled by the UI.
The final way Continue reading
The attack landscape has broadened.
