Data Centers Chapter 16 Flashcards
Define Equal-Cost Multipath (ECPM)
substantially increase bandwidth by load-balancing traffic over multiple paths on spine and leaf architecture
Define Virtual Router Redundancy Protocol (VRRP)
Open standard FHRP that provides high availability by taking multiple routers and grouping them together into a single virtual router with a single virtual ip address that clients use as a default gateway.
Define Baseline Configuration Document
Reference record of all the hardware including portable computers, servers, switches, routers, etc and software currently in use in a data center. Also includes network topology and placement of devices in the organization.
What is software-defined networking(SDN)?
Programming that allows a master controller to determine how network components will move traffic through the network, used in virtualization.
Define High Availability (HA)
A collection of technologies and procedures that work together to keep an application available at all times.
Define 3-Tiered Architecture
A traditional type of data center architecture consisting of:
access layer - provides connectivity between data center and users
distribution layer - that interconnects racks of servers
core layer - ties to gather all the switches at the distribution layer and acts as the point of connection to the external connections including the internet.
Define Distribution Layer
Interconnects racks of servers, Modern data center design leverages advances in virtualization and software defined networking to replace the distribution layer, with a virtualized mesh network
Define North-South Traffic
Data traffic entering and leaving the data center. Network devices seen in north-south traffic include, edge routers, edge firewalls, and load balancers.
Define East-West Traffic
Any network activity that moves between systems within the data center. Network devices seen in east-west traffic include, internal routers, internal firewalls, internal switches.
Define Storage Area Network (SAN)
Server that can take a pool of hard disks and present them over the network as any number of logical disks.
Define Fiber Channel (FC)
A self contained high speed storage environment with its own storage arrays, cables, protocols, cables and switches. FC is a critical part of storage area networks.
Define Internet Small Computer System Interface (iSCSI)
Protocol that enables the SCSI command set to be transported over a TCP-IP network from a client to an iSCSI based storage system. Popular with storage area network systems
Define Spine-and-Leaf Architecture
Data center architecture in which every spine switch connects to every leaf switch in a 2-tiered mesh network. Mesh network removes the need for dedicated connections between the spine back bone switches, because traffic moves seamlessly from spine to leaf to spine, regardless of how many spine or leaf switches are on the network.
Define Load Balancing
Process of taking several servers and making them look like a single server, spreading processing and supporting bandwidth needs.
Define First Top Redundancy Protocol (FHRP)
Method of ensuring high data availability by taking multiple routers and grouping them into a virtual router with a single virtual IP address that clients use as a default gateway. Common FHRP protocols are the open standard Virtual Router Redundancy Protocol (VRRP), Cisco’s proprietary Hot Standby Router Protocol (HSRP) and Gateway Load Balancing Protocol (GLBP)