There is a test for you on modern data center networking architecture provided by Erica Mixon from techtarget.com.
As business needs have evolved, so has data center networking architecture. Virtualized, abstracted networks are now gaining traction as software-defined technologies take hold in the enterprise.
But for network managers used to more traditional traffic forwarding patterns– where one IP address would simply “talk” to another–some of the more modern networking concepts can seem complicated. Familiarize yourself with virtual networks, software-defined networking (SDN) and other recent data center networking architecture trends with this quiz.
There are 7 questions testing you on modern data center networking architecture.
What is the primary function of Virtual Extensible LAN (VXLAN)?
- Manages firewall rules and troubleshoots connectivity issues
- Provides segregation of traffic, and routes traffic across a specific network path
- Enables containers to communicate with each other
- Transmits overlay packets and routes tables
In a modern data center networking architecture that supports hybrid cloud, which network layer is used to transmit VXLAN packets or other overlay packets?
- Overlay network
- Underlay network
How does SD-WAN architecture differ from traditional networking architecture?
- It uses flow tables created by an SDN controller rather than routing tables at edge routers
- It relies only on IP addresses rather than abstracted networks
- It routes tables with a core router instead of an edge router
- It depends on a three-tiered, hierarchically designed network architecture
Which is not a benefit of microsegmentation?
- Supports fast, flexible and granular security configurations
- Eliminates the need to hairpin traffic
- Ties security policies to the network hardware rather than the workload
- Eradicates need to manually configure firewall rules on individual hardware devices
How many available IDs can be assigned to a VXLAN at any given time?
- 1 million
- 16 million
Which of the following is not a feature of leaf-spine architecture?
- It has a three-tier model, consisting of an access layer, an aggregation layer and a core
- It has multiple connections to the core
- It eliminates the need for devices to wait for open connections
- It flattens enterprise networks
What are the three main functional blocks of network functions virtualization management and orchestration (NFV MANO)?
- Virtual network functions (VNF) managers, virtual machines and hypervisors
- NFV orchestrators, VNF managers and virtualized infrastructure managers (VIMs)
- NFV managers, VNF orchestrators and VIMs
- NFV orchestrators, routers and load balancers
Get the Correct Answers
CORRECT ANSWER-Provides segregation of traffic, and routes traffic across a specific network path
VXLAN is an encapsulation protocol. A VXLAN packet encapsulates traffic from one segment, delivers it across the network and decapsulates it on the other side. VXLAN can also route traffic via a specific path across the network. For example, VXLAN encapsulation can tunnel traffic flows between devices, such as firewalls, until it has travelled across all required devices.
CORRECT ANSWER-Underlay network
The modern data center network resembles a layer cake, rather than just a group of IP addresses. The underlay network — the bottom of that layer cake — provides a foundation for all other network services. The underlay transmits VXLAN and other overlay packets, so admins must understand a different way to address connectivity issues.
CORRECT ANSWER-It uses flow tables created by an SDN controller rather than routing tables at edge routers
SD-WAN architecture attempts to abstract the network infrastructure that connects LANs to one another. It uses flow tables created by a SDN controller rather than routing tables at edge routers. With traditional networks, admins had to coordinate with the networking team to ensure that applications could use the existing infrastructure to communicate with remote locations. Now, admins make changes to routing configurations by making changes at the controller, and allow the resulting table to transmit to relevant devices.
CORRECT ANSWER-Ties security policies to the network hardware rather than the workload
Software-defined networking and software-defined data center technology more easily supports microsegmentation, or the division of the data center in logical units, usually by application or workload. Among other benefits, microsegmentation ties security policies to the workload rather than the network hardware, which means that any rule applied to a workload will follow that workload, even as it migrates to different environments. This allows admins to better balance computing loads without having to create new security rules.
CORRECT ANSWER-16 million
Virtual LANs (VLANs) isolate apps and tenants in a cloud computing environment, but can only assign 4,096 network IDs at a given time — which may not be enough for a large multi-tenant environment. Virtual Extensible LAN extends the VLAN address space and adds a 24-bit segment ID, increasing available IDs to 16 million. Millions of isolated Layer 2 VXLAN networks can co-exist on a common Layer 3 infrastructure because the VXLAN segment ID in each frame segregates individual logical networks.
CORRECT ANSWER-It has a three-tier model, consisting of an access layer, an aggregation layer and a core
As data flows shift to an east to west movement in the data center, problems can arise, such as network bottlenecks and congested uplinks among the access layer and aggregation layer. Leaf-spine architecture — consisting of leaf switches and spine switches — addresses these issues by flattening enterprise networks from three tiers to two. In turn, it helps prevent network bottlenecks, improves latency, and reduces deployment and maintenance costs.
CORRECT ANSWER-NFV orchestrators, VNF managers and virtualized infrastructure managers (VIMs)
NFV MANO, an architectural framework for managing and orchestrating virtualized network functions, has three main functional blocks: NFV orchestrators, VNF managers and VIMs. These three blocks work together to deploy and connect functions and services throughout the network. NFV orchestrators control the integrations of new network services and VNFs into a virtual framework. VNF managers supervise the lifecycle of VNF instances, and VIMs manage NFV infrastructure.
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