1.7 Network Architecture Flashcards
Three-tiered hierarchy
Core Layer
Distribution/aggregation layer
Access layer
Core layer
The core tier provides a high availability network backbone that has redundant traffic paths for data to continue to flow around the access and distribution layers of the network.
-used to merge geographically separated networks back into one unit.
Distribution/aggregation layer
The distribution/aggregation layer provides fault-tolerant interconnections between different access blocks. This layer is capable of utilizing routing boundaries.
-This layer is often used to implement traffic policies, such as quality of service (QoS). I.e echo request between firewall and router
Access layer
Access/edge is where users and end devices plug into the network. This layer does not aggregate and distribute traffic from multiple different areas of the network.
Fibre Channel
Storage
The Fibre Channel connects storage area networks using 3 main types of components: the initiator, the target, and the Fibre Channel switch. The initiator is the client device of the SAN. The target is the network port for a storage device. The Fibre Channel switch, sometimes referred to as a director, provides the connections between the initiator and the target.
East-west
East-West is a term to describe traffic that travels or flows between server to server in a data center.
North-South
North-South is a term to describe traffic that goes to and from a data center. In this scenario, the North-South traffic would be the process of uploading the photos by the real estate agent.
Top of rack switching
A top-of-rack switching refers to the practice of using switches specifically made to provide high-bandwidth links between distribution switches and server nodes.
-Name the model typically used in spine and leaf topologies to connect distribution switches to server nodes and provide higher bandwidth than the typical workgroup switch.
Software-defined network
software-defined network makes all parts of the network infrastructure accessible to automation and orchestration technologies.
-application layer
-control layer
-infrastructure layer
Management plane
The management plane sits at the same level as the control plane but is in place to monitor traffic conditions and the network status.
-The management plane interfaces with the operational plane and implements monitoring of traffic conditions and network status
-The management plane monitors traffic conditions. As conditions change, changes occur at the control and data plane level to prioritize data, such as video over data during video conference meetings.
Infrastructure layer
It contains devices that handle the actual forwarding of traffic and imposition of access control lists (ACLs) and other policy configurations for security in software-defined networking.
-contains the physical networking devices that receive information from the control layer about where to move the data and then perform those movements.
Control layer/plane
The functions of the control plane are implemented by a virtual device referred to as the SDN controller.
-uses information from applications to decide how to router a data packet on the network and make decisions about how traffic should be prioritized, how it should be secured, and where it should be forwarded to.
ISCSI
The iSCSI can link Storage Area Networks (SANs) but is also seen as an alternative to Fibre Channel itself since it works over ordinary Ethernet network adapters and switches.
Application Layer
SDN
-focuses on the communication resource requests or information about the network.
