Software Defined Networking (SDN) has been gaining momentum over the past few years. Important features of SDN include:
- Separation of data and control plane,
- a well defined vendor-neutral interface between the data and control plane (e.g. OpenFlow), and
- a logically centralized control plane that provides a network view for the control and management applications. One important reason that industry is inclined towards SDN because it enables graceful scaling of network infrastructure and minimize obsolescence. Basic differences between SDN and legacy network is shown in the diagram below:
As shown in the figure above, the user will see standardized hardware which is controlled by proprietary software (Controller), which in turn is accessed by Open APIs such as REST and HTTP. The advantage is that the network admin need not know the specific hardware command syntax and only need to know the overall design and Openflow.
We can imagine the entire SDN as having an SDN controller with North-bound and South-bound interfaces as shown in the diagram below:
As can be seen in the diagram, the SDN controller is usually proprietary to the vendor. The SDN application is a standardized application that talks to the SDN controller, which in turn talks to the networking hardware.
The advantages of SDN include the following:
- Centralized network provisioning. Because it separates conceptually, the control and data planes, SDN can be used as a firewall and load-balancing traffic between networking nodes.
- Comprehensive infrastructure management. It is possible to provision the infrastructure such as servers, networking elements, etc. for more efficient and scalable operation.
- Vendor Neutrality: Enables use of old and new equipment with low obsolescence because the data plane is separated from the control pane.
- Enhanced security. By separating data plane from control pane, it is possible to enhance the overall security of the network. Further, SDN controller, being the brain of the Software Defined Networking, can be programmed to introduce additional layers of obscurity.
- Cloud infrastructure – By using SDN, the infrastructure can easily be migrated to cloud platform.
The SDN course is offered at several leading universities in USA, and typical course ware is given below:
- API between Control Plane and Data Plane:OpenFlow
- Controller Design:ONIX, POX and Floodlight
- SDN Abstraction
- Protocol Independent Forwarding
- Composition and Trace Tree
- Network Update
- SDN Application
- Traffic Engineering: Google B4, Microsoft SWAN, SDX
- Wireless Networks: SoftCell, SoftRAN, OpenRadio, OpenRF
- SDN Virtualization
- Open vSwitch
- SDN Endhosts, Middleboxes, Debugging, fault tolerance and Security
- SDN Control of Endhosts and Middleboxes
- SDN Debugging, fault tolerance and Security
Simulationexams.com released practice tests with lab exercises for Comptia A+ certification exams preparation. This is a combined product that offers both the practice exams as well as the labs for hands-on practice. The software is useful for practicing A+ exams along with simultaneous labs preparation. The practice tests features are given below:
- 300+ exam-like questions
- Custom exam settings
- Detailed explanations and online feedback
- Learn mode and exam mode to suit your requirement
- Identify weak areas
- Key concepts flashcards for each question
- Check for updates online
- Online feedback (from within the exam) and support site
- Licenses never expire
The Labsim provides several labs for hands-on experience. Practice safely without having the fear that the system might crash due to wrong settings! Since the labsim is a virtual networking environment, you can safely practice settings such as changing the control pane/networking/user controls without crashing the system or the Wifi router. A few screenshots of the labsim is given below:
a) Labsim Intro Form: Given below is an introductory text about the labsim
Currently about 75 labs are available with free demo version and detailed lab manual. Download the free version and install: A+ practice tests with labsim
The main window of the labsim is shown below:
The left pane shows the available labs. You can expand the labs in any given topic by clicking on the + sign. The right pane shows the selected lab. In this specific instance of lab, you are required to drag and drop relevant text to corresponding graphic element in the diagram. The topics covered in the labsim are given below:
- PC Hardware
- Laptops and mobiles
- Operating systems
- Printers and Scanners
Each of the above topics contain several labs for practice. It may be noted that chapter-end questions are provided in the Essentials manual.
Checkout complete details about the labs by going to the product URL: Comptia A+ Practice Tests with Labsim
According to Firebrand.com, 2018 the top IT certifications are different from last years and CEH has garnered the top slot. These are the top 10 IT certifications of 2018:
- EC-Council Certified Ethical Hacker (CEH)
- (ISC)2 CISSP
- Cisco CCNA (Routing and Switching)
- The Open Group TOGAF 9.1 Certification
- (ISC)2 Certified Cloud Security Professional (CCSP)
- GDPR Practitioner
- Certified Data Protection Officer – CDPO
- Microsoft MCSE: Cloud Platform and Infrastructure
- AXELOS PRINCE2 Foundation and Practitioner
- ISACA CISA
Cyber security, data protection, networking, cloud technology and project management have been placed under high demand certs.
Read full article here:
Simulationexams.com has updated CCNA Practice Exam recently to fix a couple of bugs that appeared on a few systems using Windows 10. As a result, some of the Simlet type of questions were not working. Additionally, a few questions had been updated.
The website simulationexams.com has been updated recently. The update provides a better navigation to our products such as labsims and Android/IOS apps. Please check out the new simulationexams.com menu. The labsims available are:
Some of the important android/ios product links are given below:
Check out the product pages for more details.
Comptia® recently released revised Security+® exam, SY0-501. The new version of CompTIA Security+ (SY0-501) emphasises on hands-on ability to both identify and mitigate security threats, attacks and vulnerabilities.
CompTIA Security+ is vendor-neutral and widely used by private and public employers and government agencies to validate essential cyber security skills for employees and/or contractors. As per the Comptia website, “On average, a test taker can expect to spend up to one-third of the 90-minute exam completing performance-based items.” So, one can expect a lot of performance based questions in the exam, and it’s almost impossible to pass the exam without having to answer the performance based questions. As per the official website: “These items include simulations of technology solutions and story-based items that require advanced cognitive thinking on the part of the test taker,”
CompTIA Security+ is ANSI accredited and complies with the ISO/IEC 17024 standard for personnel certification programs. The certification is also approved by the U.S. Department of Defense for Directive 8140/8570.01-M
Comptia has more than two million IT certifications issued and probably stands first in the world.
The practice tests offered by simulation exams .com include Comptia Security+ practice tests. We are in the process of 501 exam practice tests and the same would be available at the earliest.
Disclaimer: Simulationexams.com is not associated with Comptia® organization. Security+® is a trademark of Comptia®.
SimulationExams.com recently updated Comptia A+ Exam Simulator to include several more questions and flash card explanation. A couple of known bugs had been fixed in this revision. Check out the product page at:
A+ practice exams, offered by simulationexams.com provides 300+ questions with flash cards, and detailed stats. A+ Labsim is also available for candidates preparing for A+ Certification, and you may download the free trial version of the same.
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