MEF SDN NFV Mock Exam

A Service Provider is upgrading a set of SDN Switches in a given region. The maintenance window for network upgrades is 2 am to 4 am. The downtime must be minimized as much as possible.

• Reactively program a flow in the controller to redirect traffic toward the region at 1 am

• Proactively program a flow in the controller to redirect traffic away from the region at 1 am

• Proactively program a flow in the SDN Switches to redirect traffic away from the region at 1 am

• Reactively program a flow in the SDN Switches to redirect traffic toward the region at 1 am

The network architect needs to design a native SDN network in a greenfield environment. The network spans 3,000 miles and three data centers. The controllers must be configured in a federated model.

Which aspect of the recommended solution must be considered as the top priority in designing both the scalability and resilience of the new SDN network?

• The need to increase the interconnect speed and reduce the latency between switches in the data centers of the organization

• The key management infrastructure that must be designed to efficiently retrieve performance information from the network

• Adopting the OpenDaylight SDN solution that will feature the ability to replicate controller switch information

• Addressing the long propagation delays among controllers that can lead to a long response time in the replication of the controllers

An organization just failed an SEC test audit. Packet flooding and redundancy in an emergency are two problems cited in the audit. The security staff in the organization is advocating for expensive appliances to be purchased. The CTO wants the network architect to investigate SDN.

Which characteristics of SDN are reasons to adopt the CTO's recommendation?

• Security-defined interoperability will deliver routes that leverage the existing infrastructure and optimize traffic

• Packet-based routing will provide a better accounting of all traffic in the network through better audit log information for the auditors

• SDN will deliver better isolation of data plane traffic and will provide more flexibility to address redundancy needs

• The ability to separate control plane from the data plane automatically makes data management easier and more secure

Field trials for an organization's VNF instances have ended with success. Now, VNFs must be deployed across thousands of network segments in the global network. Which organizational goal presents the greatest challenge in the management of the new deployment?

• A comprehensive global domain VNF catalogue function

• A comprehensive MANO solution

• A robust service-chaining solution

• A multi-domain VNF replication function

The network engineer wants to design the network to be resilient and be able to continue OpenFlow Switch forwarding even if communications to the SDN Controller is lost.

• Fail normal mode

• Fail secure mode

• Fail switch mode

• Fail secure drop mode

A Service Provider deployed an SDN system to support 100,000 services. The system has the following configuration:

• 2 SDN controllers in active/active configuration

• Each SDN controller is sized for 100,000 services

The system must grow to support 150,000 services with the same level of redundancy.

What should the network architect do to support system growth?

• Increase the bandwidth between two existing SDN controllers and the available system memory

• Increase the disk space on the existing SDN controllers and increase the write cache for better performance

• Identify potential services that are duplicative and get permission for them to be removed

• Deploy an additional SDN controller of the same capacity as the existing controllers

In a mobile network, several base stations are attached to the core via a single mobile backhaul wireless link. Power is available only at the remote end of the backhaul link. The installation of an SDN switch at the remote end to connect the base stations via the backhaul link to the network core is the first step toward a dynamically configurable network.

Which approach allows the SDN controller located in the core to control the remote SDN switch?

• The SDN control connection is established in-band and isolated from the data traffic

• The SDN switch at the remote location is equipped with a battery backup unit

• The SDN control connection uses an unreliable transport protocol (such as UDP)

• The SDN control connections are established to both master and slave SDN controller

A company is running a simple web service made up of a front-end web server and a back-end database server.

Users connect to the front-end web server as shown. The company has 200 customers that generate the given CPU and memory utilization rates. The company plans to expand and the user base and workload is expected to double. The network architect needs to make the existing service capable of scale-out for the upcoming expansion. The architect also needs to identify additional service components required.

What should the network architect recommend to achieve a minimum design change while maintaining quality of service?

• Add 1 back-end database and deploy 1 load-balancer in front of the database as a new service component

• Add 1 front-end web server and deploy one load-balancer in front of the web server as a new service component

• Add 1 front-end web server and 1 back-end database and deploy a backup server as a new service component

• Add 1 back-end database and 3 front-end web servers and deploy load-balancers as a new service component

A disaster recovery test revealed insufficient isolation between VNFs and the chance of a security breach affecting a neighboring VNF.

• Increase logging and monitoring of the VNF behavior

• Distribute the VNFs across additional NFVI instances

• Actively manage the authentication of new VNFs

• Replicate the VNF catalogue across domains

A white box server hosting an SDN controller deployed at the customer site fails during an upgrade process. Connectivity to the controller has been lost.

• Console

• FTP

• SSH

• Telnet