Thursday 4 March 2021

Cisco Updates Certified Network Design Engineer Curriculum

Cisco has updated its CCDA® Associate Certification Preparation Program in Network Design. Updating curricula and exam requirements will ensure that Cisco's network design principles and strategies are aligned with the increasingly complex requirements of today's network infrastructures. In addition, new programs will help engineers objectively assess their knowledge and skills in the design, deployment and operation of networks ACDX.

"The updated Cisco curriculum will help students expand the intelligence of network architectures," said Roger Beatty, Senior Manager of Professional Education for Cisco. productivity. The new training courses and exam requirements underscore Cisco's commitment to developing products, services, and training programs that are fully responsive to partner and customer requirements."

The updated DESGN course program (Designing for Cisco Internetwork Solutions - "Designing Cisco Internetwork Solutions") takes into account the peculiarities of network convergence in the enterprise and teaches the preparation, planning, design, implementation, operation and optimization of networks. The new program includes an expanded selection of practical examples and ways to virtualize services based on Cisco's Service-Oriented Network Architecture (SONA). The new program shifts the focus from network traffic to service delivery and application support. The program includes a study of existing products, technologies, services and solutions and lays the foundation for the further development of the experience and knowledge required by the developer of routed and switched network infrastructures and services.

To complete the new program, it is recommended to obtain Cisco CCNA® certification and take an additional course BCMSN (Building Cisco Multilayer Switched Networks - "Building Cisco Multilayer Switched Networks"). CCDA certification is awarded after successfully passing the DESGN 640-863 exam.

Training courses and additional information.

Authorized training for the new program is provided by the global Cisco Learning Partners and Partner E-Learning Connection. For more information on program requirements CCDA, Cisco Specialist and other certifications Cisco can be found at . Use the Learning Locator on the Web page to find an Authorized Cisco Learning Partner .

You can use the Cisco Learning Credit to pay for authorized training, which is available through Cisco Learning Partners around the world. For information on Cisco Learning Credits, visit the page .

In the section you can find questions and answers about the CCDA program.

About Cisco Career Certifications.

The highly respected Cisco Career Certifications help you value the knowledge and skills of network professionals and provide great value to professionals, their leaders and employers. Cisco offers three levels of general certifications — associate, professional, and expert — in areas such as routing and switching, network security, and carrier networks. Cisco Specialist certifications validate the expertise in specific technology areas that are required to fill specific roles. Additional information about Cisco Career Certifications is published on the Cisco website in the section .

Wednesday 3 March 2021

Fiber optic network testers

OptiConcepts FiberWarrior Pro ™ OTDR is a state-of-the-art system for testing, troubleshooting and documenting fiber optic networks. Combining a high-performance processor, sophisticated signal processing and an advanced software design, FiberWarrior offers users a high-quality solution for fiber optic analysis both in the field and in the laboratory. The modern design allows for easy portability and storage.

The sleek design of the FiberWarrior OTDR features a high-quality 8.4 "TFT LCD touch screen that allows for the best user experience, providing an easy-to-view interface in both dark and bright environments (including sunlight) for easy identification certain network elements and user controls.The centrally positioned screen fills the front of the unit while visually optimizing graphs, tables and other technical information via the carefully designed interface.The handles on both sides of the display allow the user to easily operate the unit For the use of benches or laboratories, the devices are equipped with a removable stripe, providing access to mounting holes that allow the use of standard LCD mounts.The customizable touch screen further enhances and simplifies use, eliminating cumbersome buttons and controls.

Last but not least, the extensibility of the FiberWarrior OTDR platform includes many other test modules, including power meters and optical sources. The scalable design will significantly reduce the cost of future testing requirements, as well as simplify and reduce the additional training required with other optional optical testing solutions. In addition, USB ports, Ethernet port, and Wi-Fi capability instantly allow an unlimited number of devices and connectivity methods to save traces, networking, printing, and email to help enhance the optical testing experience.


General characteristics: dark fiber cost

• Combines the rigor of field use with the accuracy of the degree of laboratory use.

• Modular design supports multiple interchangeable test systems

• High quality TFT color touch screen, can be easily read in excessive light conditions.

• High quality housing with integrated side handles

• Fast Intel Atom processor with Windows XPe or Linux operating system

• Intuitive control functions via touch screen for ease of use

• Advanced PWRScan ™ event detection algorithms for accurate reporting

• Built-in Wi-Fi for easy network connectivity

Tuesday 2 March 2021

F5 NETWORKS

F5 Networks is a multinational corporation in the technology sector. Its solutions focus on the security, performance and availability of web applications. The company was founded in 1996. Its headquarters are located in Seattle, Washington (USA).

Products f5 big ip

F5 Networks solutions cover several areas of IT: information security, network infrastructure, corporate services and applications.

In its projects, COMPLETE uses the following vendor products:

BIG-IP Local Traffic Manager (LTM)

BIG-IP Access Policy Manager (APM)

BIG-IP Advanced Firewall Manager (AFM)

BIG-IP Application Security Manager (ASM)

Secure Web Gateway Services

and other F5 products

Partner status

COMPLETE is an authorized partner of F5 Networks.

Monday 1 March 2021

Linux System Administrator (CROC Cloud)

Vacancy description

We are a friendly and ambitious team of CROC Cloud Services. CROC Cloud is our core product. It is a proprietary IaaS platform that provides reliable services to more than 300 companies and allows us to grow steadily from year to year and enter the TOP-5 largest cloud providers in Russia. Our main focus is the technological development of the Cloud, so we are always looking for talented specialists who are interested in teamwork on their own, unique product.


Your tasks

Research and implement technologies that allow creating new and improving existing services of our Cloud;

Automate solutions to infrastructure problems; sysadmin salary

Ensure continuous operation of the Cloud infrastructure and data center.


Our expectations

Fundamental knowledge of the structure of UNIX-systems;

Understanding of network technologies TCP / IP, HTTP, DNS, etc .;

Ability to correctly express your thoughts, draw up and carefully maintain documentation.


Additionally welcomed

Practical experience with languages, tools, solutions:

MongoDB, Docker, Git, Python, Ansible, QEMU, Ceph, Puppet, Zabbix, Grafana, MS Windows Server;

Experience with iron.


We offer

Salary based on the results of the interview + bonuses based on the results of work;

Training at a corporate university, compensation for courses, certification at the expense of the company;

Teamwork with leading experts in the market, the ability to expand competencies and grow within the company;

VHI with a full package of medical services;

Subscription to fitness centers and sports programs with compensation from the company, a gym in the office;

Comfortable office with free meals and parking;

Friendly atmosphere, corporate team building, employee events.

Saturday 27 February 2021

CISCO CERTIFIED NETWORK ASSOCIATE (CCNA) - CERTIFIED CISCO NETWORKING SPECIALIST

1. Introduction to network technologies.

This introductory course on networking will help you get started preparing for a career in networking. The first in a three-course CCNA series provides an introduction to the architectures, models, protocols, and network elements needed to operate and address the priorities of both Fortune 500 companies and innovative small retailers. In this course, you will learn how to create simple local area networks yourself. You will gain a working knowledge of IP addressing schemes, basic network security concepts, and will be able to configure the basic parameters of routers and switches. There are no prerequisites ccna wireless salary.

2. Basics of switching, routing and wireless communication

The purpose of the second course in the CCNA series of three courses is to go deeper into networking. This course focuses on switching technologies and how routers work to support networks in small and medium-sized organizations. It also covers wireless local area networks (WLANs) and security issues. You will learn how to perform basic network configuration, find and troubleshoot problems, identify and remediate LAN security threats, and configure and secure basic WLAN environments. Recommended training: CCNA: Introduction to Networks course   or relevant knowledge.

3. Corporate networks, security and automation

The third course in the CCNA series, which is a three-course course, provides an in-depth look at various architectures and considerations for the design, security, operation, and troubleshooting of corporate networks. It covers the specifics of building wide area networks (WANs) and applying quality of service (QoS) mechanisms to secure remote access. Students will also learn about software-defined networking, virtualization, and automation — the basics of digital networking. Recommended training: CCNA: Switching, Routing, and Wireless Essentials course   or relevant knowledge.

The training process uses Packet Tracer. It is a powerful virtual network simulation software developed by the Cisco Academies program. Available free of charge to all instructors, students and graduates of the academy. Packet Tracer complements the physical environment by enabling a virtually unlimited network of devices, encourages open learning, and empowers hands-on, creative exploration and diagnostics.

Thursday 25 February 2021

How to bend the light? Or a short excursion into the world of fiber optics

Good day, reader! Surely everyone has heard of fiber optics, many have dealt with it in telecommunications, someone even has a fiber-optic cable installed in the house. In general, this term is well known; and the essence of the question - the transmission of light over a distance along a thin fiber - is generally clear. But I suggest going a little deeper into this technology, which has changed the world in many ways. In this post I will try to explain in a simple and understandable language the essence of fiber optics, how it works - at the level of simple physical understanding, with simplifications and examples, without scary formulas. In other words, “on the fingers”. If interested, then welcome to cat. Caution : a lot of text, there are pictures.

By the will of fate, it so happened that my education, and then my professional activity, is closely connected with optical fiber and lasers. After working in telecom for some time, and then moving into the field of scientific development and measurements, I had the opportunity to notice that not everyone is familiar with optical fiber at the level of deep understanding, even among laser technicians and telecom operators. Telecoms tend to perceive fiber at the patch cord or cable level. For them, it is a patch cord or an abstract communication line. Yes, with attenuation, dispersion, welds and reflectograms, but only with a superficial understanding of the physical principle of operation. Of course, this is not a bad thing at all, just such are the features of their work. Anyway, the desire to write a popular science article on the very essence of fiber optics has arisen more than once, especially since education and experience allow us to do this: everything that is written in this article is not only "material from textbooks", but also my personal experience. On the one hand, I would like to dwell on many points in detail, but on the other, the article will be too large. It was decided to do this: this article is an introductory overview. If the public is interested, a series of posts will follow, devoted to the most interesting questions in the vast fiber-optic topic. I hope it will be interesting. It was decided to do this: this article is an introductory overview. If the public is interested, a series of posts will follow, devoted to the most interesting questions in the vast fiber-optic topic. I hope it will be interesting. It was decided to do this: this article is an introductory overview. If the public is interested, a series of posts will follow, devoted to the most interesting questions in the vast fiber-optic topic. I hope it will be interesting splicing fiber optic cable.

How it works?

The first thought that arose in my, then a child's brain, when I first saw such a light-guide lamp , was "How does it work !?" At school we were taught that light in a homogeneous environment propagates in a straight line. How to bend the light? I learned the answer a little later. We have all heard about the effect of total internal reflection, the so-called. Air defense. If light leaves a denser optical medium (glass) into a less dense optical medium (air), n glass> nair, then at a certain angle of incidence the light may not come out, but will be reflected back. This is all well known to us since school. This phenomenon hides rather thick equations of wave propagation of light and volume theory. But we do not need it now, it is enough to know what it is. Almost everyone watched air defense in everyday life. At least the one who dived with a mask under the water. From the water we can see everything that is directly above us, but at some periphery we see the mirror surface of the water and do not see what is above it - this is the air defense.

Now let's imagine we have a sheet of glass in the air. If you shine a laser pointer at the end of it at a small angle to the plane of the surface, then its light, repeatedly reflected, will come out from the other side of this glass - this is the phenomenon of air defense. Now let's take a glass rod - the effect will be the same. In this case, the light is limited not in one, but already in two planes, of course, if the angle of incidence of the light does not exceed the TIR angle.

But if we replace the glass rod with a transparent fishing line, then the light will spread in it, but it can already be "bent". Of course, as long as the bending radius is large enough. When the bend radius becomes small, light will come out of the line at this point, since the angle of incidence of the light on the surface of the line will be greater than the TOR angle. Notice that the line doesn't have a mirror finish, the light is held in it by itself. This is roughly how optical fibers work. The light in them spreads until the air defense law is violated and the light leaves the light-guiding vein. Optical fiber is essentially the same line in a decorative lamp, but with a more complex structure.

In general, there are a huge number of types of optical fibers, differing in shape, size, material, coating, properties, fields of application, etc. Reviewing and comparing different types of fibers is a topic for another huge article. However, all these fibers are structurally united by one thing: they have a light-carrying core (core) with a higher refractive index and a cladding (cladding) with a lower refractive index. Due to this, the air defense effect is achieved. As for the dimensions of the fibers, then, depending on the design and field of application, they can be from 50 microns to 1 mm or more in diameter (meaning the fiber itself without protective sheaths). Applying various protective sheaths increases the fiber diameter several times. In this article, I will consider only the simplest and most common types of fibers used in telecommunications.

How is it done?

Telecommunication fibers, and many others, in 99.9% of cases are made of pure quartz glass. Chemical formula SiO2. Window glasses are made from it, but with impurities that block UV radiation: Na2C03, K2CO3, CaCO3. There is enough information on Wikipedia about silicon dioxide. Yes, flexible optical fibers are actually made of glass - some people didn't believe me. The stereotype that glass does not bend, but pricks and beats is firmly embedded in human heads.

It is well known that glass has an amorphous structure, which means that it does not have a fixed melting point like crystalline substances. When heated, the glass softens and becomes viscous and you can easily pull the "thread" out of it. However, such a fiber, although it bends, is very fragile, since microcracks quickly form on its surface, which destroy the fiber when the stress on their surface increases during bending. The freshly drawn fiber is immediately covered with a polymer film that protects against microcracks. But first things first.

I will describe the "classical" scheme for the manufacture of single-mode telecommunication fibers with vapor deposition. First, a glass tube is taken about a meter long or slightly more and a few centimeters thick. It is hollow inside. Its inner diameter determines the thickness of the light-carrying core. The main difference between such glass is a very high degree of purification from impurities and OH-groups. This is necessary in order for the fiber to have maximum transparency. The pipe is laid on the machine and begins to rotate around its axis, gradually warming up with a burner with a temperature of 1200-1500 ° C. A mixture of gases O2, SiCl4, GeCl4, etc., provided by the technology, is blown into the pipe from the end under pressure.

Epitaxy of germanium dioxide and SiO2 occurs on the surface of the hot glass billet pipe. Germanium dioxide increases the refractive index of pure quartz and has practically no effect on transparency. The desired profile of the refractive index of the core is grown from the gas phase by adjusting the ratio of gases supplied to the preform.

After building up a layer of the required thickness, the burner temperature increases. The glass softens more and the core cavity through which the gas was blown gradually collapses under the action of the surface tension force. It looks something like this:

And this is how the blanks ready for drawing look like:

It turns out a one-piece glass rod with a high refractive index inside - this is the future light-guiding core. Then the rod is installed vertically and the burner heats up its lower end, softening it more. A dummy bar is brought to the workpiece, after which the stretching process begins. Who ever glued with glue a la "Moment" perfectly knows what it looks like.

Wednesday 24 February 2021

Quality data center - the basis of a successful business

Without really good data centers, you can't provide services or effectively manage your own IT. In the cloud age, data centers are the cornerstone of IT systems. Building centers and their infrastructure includes a whole range of important components, not only storage itself, but networks, cooling, backup power and more. The eleventh year of the Data Storage Wokshop, which will take place in Prague on September 20, 2016, aims to bring participants the latest information in this area, even with the participation of experts from companies that are world leaders in this field cisco one data center.

The workshop program will begin with a presentation by David Kolenatý from Cisco "The Future of Data Centers and Their Use for Business", in which he will discuss the strategy for defining innovative data centers with an emphasis on the current automation strategy and policy settings. The goal is to simplify and streamline the overall infrastructure and provide quick and easy deployment of their applications. In the next lecture, participants will learn about the new Hyperflex platform, which is Cisco's debut in the field of hyperconverged solutions. The attractive topic of "flash media" was chosen by Luděk Šafář from EMC. Compared to rotating disks, flash media has already reached the point where they offer higher performance at lower prices.

The workshop cannot miss any of the great topics of today - the Internet of Things. The most widespread and unique network for IoT in the Czech Republic - Sigfox - will be presented by David Týr, innovation manager of T-Mobile.

The conference will be closed by the presentation of a case study of the implementation of the TTC TELEPORT data center, which, with an area of ​​8,000 m2, is one of the largest in the Czech Republic and in Europe. In addition to the representatives of the project implementers from Pronix, the CEO and Executive Director of TTC TELEPORT, Radek Majer, will speak.

SUSE, Abacus Electric, Avnet, Anect and Acronis will also participate in the conference program.

Cisco Updates Certified Network Design Engineer Curriculum

Cisco has updated its CCDA® Associate Certification Preparation Program in Network Design. Updating curricula and exam requirements will ens...