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Multi-layer Sequence Diagrams Examples

What is System Sequence Diagram? A sequence diagram shows object interactions (communications) set in time sequence. It shows the objects and classes tangled in the state and the order of communications exchanged between the objects required to carry out the functionality of the state. They are typically related with use case understandings in the Logical or Rational View of the system under progress. Sequence diagrams are occasionally called event diagrams or even event scenarios. A sequence diagram displays, as parallel vertical lines which means lifelines, different procedures or objects that live instantaneously, and, as horizontal arrows, the communications exchanged among them, in the same direction in which they happen. This permits the requirement of modest runtime situations in a graphical style. In short… Sequence Diagrams includes: The interaction or the communication that takes place in an association that either understands a use case (generic diagrams) H...
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VLAN, Link aggregation and VLAN Trunk Configuration in GNS3

In this GNS 3 config example I'm going to show different commands to connect PCs from different networks through routers and switches. I've already created the network diagram as shown below in the figure.  If you don't know how to add devices in GNS3, read my previous article  HERE I've added 3 PCs and gave hostnames as YCH1, YCH2, and YCH3. Also two switches YCSW1 and YCSW2. One router YCR1. You can see the IP addresses and ethernet links between all the devices as well as a trunk between switches through f1/2. I'm going to discuss following questions/topics: How to assign IP addresses with default gateways? How to create VLANs (VLAN 10 and VLAN 20) on both switches? How to assign the switch ports to the VLANs? How to configure Link Aggregation for the two links between YCSW1 and YCSW2? How to create VLAN trunk for the aggregated link between SW1 and SW2? How to assign IP addresses to the router interfaces? Always save your work after cre...
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How to Add PCs, Routers, Switches and Create a Network in GNS3?

What is GNS3? In computing language, an emulator is software or hardware that allows one computer (the host) to act like another computer (the guest).  An emulator permits the host to run software or use exterior devices intended for the guest.  Graphical Network Simulator 3 (GNS3) is a network software emulator.  It allows the amalgamation of virtual and actual devices, used to simulate compound networks. It practices Dynamips emulation to simulate the Cisco IOS. GNS3 is used by many large corporations including Walmart, NASA and AT&T. GNS3 is also widespread for training of network skilled certification assessments.  Let's start discussing on how to use GNS3 in Linux OS. You can see in the image that if you've gns3 installed in the virtual OS environment or even on local PC, you can just search for it and open it by clicking on it. When you click on the GNS3, it's gonna pop up new project window. If you've saved project, you c...
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How to save all the images from a word file to PC easily? [2 Different Methods with 4 Steps]

Have you ever tried to essentially save all the images from a word file to PC in a few simple steps?  Did you try to save it one by one image?  Isn't that awful feeling to save all the images one by one from a doc file that is too long?  Microsoft Word lets us insert images with no trouble and without plummeting any resolution, which really is quite significant. We might face a circumstance where all we want is to share only pictures and not the entire word document.  OR Let’s essentially think a scenario in which you might for the most part have removed all images from your PC after creating a word document in a sort of major way. [and it doesn’t make any sense to keep all those images if we don’t own them, right?]. But now you want to get those images back from the document.  In any case, generally what every person would do is to right-click on the image and select the option “Save image as” and anyone will be able to save the images i...
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The Magic of Diasporas[Immigrants]

The Magic Of Diasporas The following views are based on this Harvard Article: https://hbr.org/2013/10/diaspora-marketing Immigrant networks are a rare bright spark in the world economy. Rich countries should welcome them. Diasporas are groups living away from their birth countries such as first-generation immigrants. The idea is to market your brand to a group that is familiar with and has an affinity for offerings that come from their home country. When that group provides a sales base, it gradually expands to people connected to the diaspora and finally to a broader market. This strategy avoids the often unfeasible attempt to build a brand on foreign shores from zero. This is not a good time to be foreign considering the growing economic importance of diasporas, and the contribution they can make to a country's economic growth. – The Economist Old networks, new communications Diaspora networks have always been a potent economic force, but the cheapness and...
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