Chapter 16: Data Centers Flashcards
What are the three layers that make up the three-tiered architecture for traditional data centers?
- Access/edge layer
- Distribution/aggregation layer
- Core layer
The ____ layer acts as the primary connection between the data center connectivity and the users (servers).
Access/edge
A common implementation of access switches is ____, in which every equipment rack has a Layer 2 switch (or two for redundancy) sitting at the top of the rack, connecting to all the systems on the rack.
top-of-rack switching
Each group of computers connected to the same access switch is known as a ____.
module
A ____ is a server that can take a pool of hard disks and present them over the network as any number of logical disks. The interface it presents to a client computer pretends to be a hard disk and enables the client’s operating system to read and write blocks over a network.
SAN or Storage Area Network
A process in which an organization places its own server hardware in a public, third-party data center is called ____.
co-location
What is the spine-and-leaf architecture in data centers?
Where every spine switch connects with every leaf switch in a two-tiered mesh network.
What protocol provides load balancing in a spine-and-leaf data center?
ECMP or Equal-Cost Multipath
____ means to have multiple pieces of interconnected equipment, such as servers, appear to the network as a single (logical) device.
Clustering
____ is the ability for backup systems to detect when a master has failed and then to take over.
Failover
Clustering solutions are an example of ____ high availability (HA) in that all members of the cluster are active at the same time.
active-active
____ is an open standard protocol that enables redundant routers to appear as a single virtual router with a single virtual IP (VIP) address for high availability.
VRRP or Virtual Router Redundancy Protocol
____ is a Cisco proprietary protocol that enables redundant routers to appear as a single virtual router with a single virtual IP (VIP) address for high availability.
HSRP or Hot Standby Router Protocol
VRRP (Virtual Router Redundancy Protocol) and HSRP (Hot Standby Router Protocol) are examples of ____ high availability (HA) in that only one router is active at a time. All other routers are passive until the active router fails.
active-passive
____ increases availability by ensuring lines out of your network follow different paths to other networks.
Path diversity
