The increase in public cloud deployment is forcing companies to begin to explore how to take advantage of SD-WAN. As more and more traffic flows out of the data center, software-defined wide area networks (SD-WANs) may help companies curb ever-increasing network costs. But few IT departments have experience managing this emerging technology. Joe Skorupa, vice president of Gartner, said: "Companies are looking for ways to monitor their entire network in a more consistent way, from the data center to the WAN." Integrating these features into a single device via SD-WAN offers many advantages to the enterprise. According to Gartner, revenue from public cloud services is expected to grow 18%, from $209.2 billion in 2016 to $246.8 billion in 2017. The flexibility afforded by these cloud services allows organizations to fully transfer data center management efforts through public clouds or to divert certain functions through hybrid clouds. However, public cloud deployments have significantly changed corporate network traffic. Traditionally, data traffic has moved primarily within the data center. For example, a high-speed connection gets information from a server and writes it to the storage system. In the public cloud, these tasks will leave the enterprise. Instead of moving tens or hundreds of feet in the data center, the data moves tens or hundreds of miles across the WAN. Therefore, enterprises need to install or upgrade high-bandwidth communication services. Multi-protocol label switching (MPLS) is currently very popular, but Internet-based options have also received widespread attention, and they are less expensive, although they do not provide the same level of reliability. MPLS lines are dedicated circuits, and in the Internet, bandwidth is allocated on a first come, first served basis. If too many companies need to move information at the same time, some companies need to wait for the transfer of other companies to complete. Enterprise network devices are typically composed of a complex set of autonomous devices: routers, WAN path controllers, WAN optimizers, firewalls, and other security tools. These usually run in an independent manner, so they can be expensive and difficult to manage. In the past, configuring and changing network devices required a lot of manual input. In many cases, companies need on-site technicians to keep network devices running at remote locations. Among the many advantages of SD-WAN, the biggest advantage is that it is based on modern computing technology, and it provides simpler maintenance and higher efficiency than traditional network equipment. Another advantage is that it supports multiple types of connections. For example, enterprises have a variety of WAN services, MPLS, broadband, and wireless networks. SD-WAN provides a common interface to manage all of these services and run them all on one line. If one of the connections is overloaded, the SD-WAN can take the unused capacity from the other connection and use it to temporarily fill the gap. Despite the many benefits of SD-WAN, the technology faces some obstacles and challenges IT departments. For today's enterprises, downtime is really rampant, so network engineers are often reluctant to make major changes, such as deploying new WAN devices. Moreover, SD-WAN is different from traditional network equipment and requires network engineers to learn new skills. At the same time, the integration of many different network devices makes it challenging to identify the root cause of network problems. According to IDC, global SD-WAN infrastructure revenue is expected to reach $887 million in 2017, an increase of 76.6% from 2016. Sales of SD-WAN hosting services are expected to increase from $48 million in 2016 to $200 million in 2017, which is a 325% growth rate. IT's growing interest in SD-WAN has attracted a variety of vendors to enter the market, including Brocade, Cisco, HP and Huawei, as well as WAN optimization experts such as Silver Peak, Riverbed and Talari Networks. Startups such as Cato Networks, CloudGenix, and VeloCloud also offer related products. Electronic Components Resistor
Resistor (Resistor) commonly known as resistance directly in our daily life.It is a current limiting element. When the resistance is connected to the circuit, the resistance value of the resistor is fixed, usually two pins.Fixed resistors are those whose resistances cannot be changed.Resistance variable is called potentiometer or variable resistor.The ideal resistor is linear, that is, the instantaneous current through the resistor is proportional to the applied instantaneous voltage.Variable resistor for partial pressure.On the exposed resistor body, one or two movable metal contacts are pressed tightly.The contact position determines the resistance between any end of the resistance body and the contact.
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