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QSDN的目标还是应用为王的，当前主要有哪些困难？
A 1. Some companies thought some parts of the networks don’t need to be updated with SDN technology, such as the core network which is adequately provisioned already for near-term increases in traffic. Both the carrier edge and data center networks, however, need to be redesigned for improved flexibility, given the lack of visibility into the future mix of applications or the growth in workloads. Scalability remains a significant challenge. 2. A few companies state network virtualization is applied to equipment beyond switches and that they expect carriers to focus on monetize the network first, before thinking about SDN implementations 3. There were many discussions about all the overlay networks that are emerging to resolve scalability issues both at Layer 2 and Layer 3, such as PCE, Openflow, VXLAN, STT, NVGRE etc. protocols.
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Q软件定义网络（SDN）有哪些优势？
ASoftware defined networking (SDN) moves networking from hardware to the software plane, under management of a software controller. Benefits include automating and easing network administration duties and improving application performance.
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Q是如何保证用户产品具备差异化特色的？
AAs hardware becomes commoditized, the focus is on software. It is the duty of software developers to focus on differentiation.
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Q选择合适的方案主要考虑哪些方面？
AThere are a lot of things needing to get clear for preparing different SDN projects. 1. What scale of the infrastructure? For 1000 usrs, 10,000 or 100,000 users 2. What is the target or applications? Data center or providing certain services 3. What equipments are needed to meet the target? 4. What management methods shall be used and how many engineer resources are needed?
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Q掌握SDN模式需要工程师掌握哪些知识？
A Engineers need to know the OPENFLOW architecture and protocol.
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Q主持人，你好，我有如下疑问： 1.C29X是硬件集成了RSA 2048bit协处理器吗，该协处理器在进行1Kb的数据大小的数字签名认证时大概需要多少时间呀？ 2.C29X目前可以应用于车载ECU吗？ 3.FSL在车载方面的MCU预计何时能够集成RSA 2048bit以上的协处理器？ 谢谢！
AC29x can support 2048bit public key operation around 500K per second. We have crypto accelerator for the i.MX product family. It can do bulk encryption. THe 2k bit key performance will be much less, but the bulk encryption rate is more than sufficient.
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Q软件定义网络（SDN）的安全性如何？
A SDN technology can help improve security, like DDoS attack. Type a few lines into your computer, and the network you are controlling alters appropriately, sending all DDoS traffic into a black hole. SDN can help by allowing administrators to route all (internal and perimeter) traffic through one central firewall. An additional benefit of network traffic flowing through a single point, it facilitates real-time capture and analysis of IDS and IPS data. But with SDN, the industry knows certain vulnerabilities are native to the approach. First, centralizing control in an SDN controller removes protective, layered hardware boundaries such as firewalls. Second, by decoupling the control plane from the data plane, SDN introduces new surface areas such as the network controller, its protocols and APIs to attack.
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Q服务和部件分开有什么优势？
ADecoupling services and equipments can free up the physical equipments. It can let many or alterntive equipments act as the server of the service. That could speed up the service processing, add reliability(with redundant equipments) and easy maintenances.
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QopenFlow与Vmware有哪些不同？
AVMware is for running virtual machine. OpenFlow is to route traffic base on pre-define attribute to a given virtual machine. They complement each other.
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QopenFlow与Vmware哪种一个用更广泛？
AThey are different. VMware is used on desktop for users. Openflow is used in network backbone equipments, like switches and controllers.
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Q未来网络虚拟化的发展方向是怎样的？
AThe cloud and virtualization are reducing costs and transforming networking. With the right control, these technologies grant organizations the flexibility and business agility to not only reduce costs, but increase the ability to evolve at the speed of business. Network virtualization(NV)can be used to create virtual networks within a virtualized infrastructure. This enables VN to support the complex requirements in multi-tenancy environments. NV can deliver a virtual network within a virtual environment that is truly separate from other network resources. In these instances, NV can separate traffic into a zone or container to ensure traffic does not mix with other resources or the transfer of other data.
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Q标准领域的差异化的含义，二者的关系？
ADifferentication in the land of standards. We use this topic to point out that software defined network is a new technology which provides different definitions/functions on network equipments embedded with tons of legancy networking standards. SDN redefines the behavior/function of switch, router, gateways and other networking equipments in the backbone networks. SDN provides rapid configuration in seconds, centralized network management, adaptive traffic management and applications are aware and influence network. It sure will be an important networking protocol/methodoligy in the near future.
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Q使用飞思卡尔的解决方案会增加产品的成本吗？
A That depends on what QorIQ part you choose. It is better you tell us your requirement and our salesman or FAE can do a survey and then tell you which one is best for your requirement. That could save your time and money.
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Q加速引擎发展的方向是什么？
AHardware accelerators are here to stay, and the performance will increase over time. The most popular accelerators are included cryptography, DPI, compression, network flow classification, and multicore managment.
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Q在物联网的发展中，飞思卡尔的产品如何保障安全和隐私的？
AFreescale offers hardware accelerator for encryption (IPsec, etc), authentication (CBC, etc), and crypto key (RSA, etc) computation so one can protect the traffic on the network. In terms of the processor, freescale offer Trust Platform Module (TPM) like solution to protect the processor and critical data within the running environment.
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QSDN的核心构建模块有哪些?
AThe SDN modules include SDN layer, controller and physical network. The SDN layer provides virtual services and is supported by the centralized CONTROLLER. The CONTROLLER uses OpenFlow protocol to manage the real physical switches.
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Q硬件手段支持或代替一些软件来实现功能有什么优点？
AIn general hardware accelerators will give you much better performance through put, and free up CPU cycles for other software tasks.
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QSDN对无人驾驶汽车的发展有哪些帮助？
AFrom a future filled with self-driven cars to droid/sensor/bot intelligence to 1G delivered to every home, networking infrastructure must be become more agile and flexible in order to accommodate this information deluge. Networks of today have a huge problem. SDN has tremendous promise to reduce costs, accelerate service introduction and fuel innovation. With the SDN network, the control on self-driven cars could become feasible. Next step, turning self-driven cards into profitable business is not a dream. There's one foreign company which has done some ice cream delivery promos in the past.
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QVxLAN是什么，有什么作用？
AVXLAN lets you create a Layer 2 network on top of a Layer 3 network using encapsulation, increasing the number of entities you can connect up to about 16 million. Since virtual machines (VMs) can't connect across multiple Layer 2 networks without breaking their links, it's a game-changer for the software defined network and is now fully supported inside Linux.
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QOpenFlow如何克服版本演进这个问题？
A There's no easy ways to deal with the upgrade of openflow version. Sometimes, it relates to hardware constrain. Then developers need to build a new hardware platform to meet the requirements in new stanards. Luckily, if the changes can be workarounded by software, software engineers have to learn the whole bunch of knowledge included in the new standards, and implement new codes for them.
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