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QUESTION 31
An organization plans to deploy a spine/leaf network topology to support a cloud design. Leaf switches will use layer-3 protocols to communicate with the spine switches. Hosts will each connect to two leaf switches using layer-2 protocols. Which technology must be enabled between the host and leaf switches to provide the maximum throughput for a single data stream?
A. Generic Network Virtualization Encapsulation
B. Spanning Tree Protocol
C. Equal-Cost Multi-Path Routing
D. Multi-Chassis Aggregation
Answer: A
Explanation:
Generic Network Virtualization Encapsulation (Geneve) is the peacemaking protocol drafted to unify VXLAN, NVGRE, and whatever other tunneling protocols emerge for network virtualization. Geneve doesn’t exactly replace VXLAN and other protocols. Rather, it provides a common superset among them, so that outside software can provide hooks to Geneve rather than having to accommodate multiple encapsulation standards.
Note:
NVGRE (Network Virtualization using Generic Routing Encapsulation) is a network virtualization technology that attempts to alleviate the scalability problems associated with large cloud computing deployments. It uses Generic Routing Encapsulation (GRE) to tunnel layer 2 packets over layer 3 networks. Its principal backer is Microsoft.
https://www.sdxcentral.com/articles/news/intel-supports-geneve-unify-vxlan-nvgre/2014/09/
QUESTION 32
During an assessment for an organization’s cloud design, a cloud architect discovers that developers will be creating applications for tenants. The applications will self-scale based on an internal trigger. The architect has included cloud management platform (CMP) components in the design that will support this requirement. To meet this requirement, what else should the cloud architect consider?
A. Mechanisms exist for assigning IP addresses and updating DNS
B. Mechanisms exist for changing host CPU over-commitment ratios
C. A CMP account with elevated privileges exists that can be shared with developers
D. Component APIs are located on an isolated network
Answer: B
QUESTION 33
You are creating a cloud infrastructure design for an organization. The cloud design includes physical servers with hypervisors which will be used to host consumer services. The hosts are managed through a hypervisor element manager. Which step should be taken to secure the hypervisor environment?
A. Place the element manager administrative interfaces on a consumer-facing network and hypervisor administrative interfaces on an isolated network.
B. Place the element manager administrative interfaces on a consumer-facing network and hypervisor administrative interfaces on a secure network.
C. Place the element manager and hypervisor administrative interfaces on a secure network.
D. Place the element manager and hypervisor administrative interfaces on a consumer-facing network.
Answer: C
QUESTION 34
A cloud design contains multiple hosts that are running a hypervisor. Each host has only two physical 10 Gb network adapters. The hosts reside in different subnets but can communicate with each other. Each host will support numerous virtual machines and network segments. What is needed to support a network segmentation in the current configuration?
A. IDS
B. NVGRE
C. MLAG
D. VLAN
Answer: B
Explanation:
NVGRE (Network Virtualization using Generic Routing Encapsulation) is a network virtualization technology that attempts to alleviate the scalability problems associated with large cloud computing deployments. It uses Generic Routing Encapsulation (GRE) to tunnel layer 2 packets over layer 3 networks.
Incorrect:
Not C: MLAG is the ability of two and sometimes more switches to act like a single switch when forming link bundles. This allows a host to uplink to two switches for physical diversity, while still only having a single bundle interface to manage.
https://en.wikipedia.org/wiki/Network_Virtualization_using_Generic_Routing_Encapsulation
QUESTION 35
An organization wants to deploy applications that can programmatically alter network behavior. In addition, they want to deploy additional network services in real-time. Which cloud-management component should be included in the design to support this requirement?
A. Hypervisor Element Manager
B. Software-Defined Network Controller
C. Network Management Controller
D. Virtual Switch Manager
Answer: B
Explanation:
An SDN controller is an application in software-defined networking (SDN) that manages flow control to enable intelligent networking. SDN controllers are based on protocols, such as OpenFlow, that allow servers to tell switches where to send packets. In effect, the SDN controller serves as a sort of operating system (OS) for the network. By taking the control plane off the network hardware and running it as software instead, the controller facilitates automated network management and makes it easier to integrate and administer business applications.
http://searchsdn.techtarget.com/definition/SDN-controller-software-defined-networking-controller
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