Topic 7 Flashcards
what is fault tolerance
Fault Tolerance simply means a system’s ability to continue operating uninterrupted despite the failure of one or more of its components.
what are magnetic devices
Magnetic devices are components for creating, manipulating or detecting magnetic fields. .
Hard drives are magnetic devices
what is raid 0
RAID 0 is used to boost a server’s performance. It’s also known as “disk striping.” With RAID 0, data is written across multiple disks. This means the work that the computer is doing is handled by multiple disks rather than just one
what is raid 1
RAID 1 is a fault-tolerance configuration known as “disk mirroring.”
With RAID 1, data is copied from one disk to another, creating a replica, or mirror. If one disk gets fried, the other can keep working. It’s the simplest way to implement fault tolerance and it’s relatively low cost.
The downside is that RAID 1 causes a slight drag on performance
what is raid 5
RAID 5 is by far the most common RAID configuration for business servers.
This RAID level provides better performance than mirroring as well as fault tolerance.
With RAID 5, data and parity are striped across three or more disks.
what is raid 6
RAID 6 is also used frequently in enterprises. It’s identical to RAID 5, except it’s an even more robust solution because it uses one more parity block than RAID 5. You can have two disks die and still have a system be operational.
what is raid 10
RAID 10 is a combination of RAID 1 and 0 .
It combines the mirroring of RAID 1 with the striping of RAID 0.
RAID 10 gives the best performance, but it is also costly,
RAID 10 requires twice as many disks as other raid levels, for a minimum of four.
what is the difference between UDP and TCP?
TCP is a connection-oriented protocol, whereas UDP is a connectionless protocol.
A key difference between TCP and UDP is speed, as TCP is slower than UDP.
Overall, UDP is a much faster, simpler, and efficient protocol, however, resending packets that get lost is only possible with TCP.
what does UDP stand for
User datagram protocol
what does TCP stand for
transmission control protocol
what is defragmentation
Defragmentation, also known as “defrag” or “defragging”, is the process of reorganizing the data stored on the hard drive so that related pieces of data are put back together.
what are the 7 OSI model layers (please do not throw sausage pizza away)
Physical
Data Link
Network
Transport
Session
Presentation
Application
what are the 6 network topologies (string beans run through my house)
Star Topology Bus Topology Ring Topology Tree Topology Mesh Topology Hybrid Topology
what does OSI stand for
Open Systems Interconnection
what is the presentation layer in the OSI Model
Some functions of the presentation layer includes data conversion, data encryption and decryption, and data translation
The presentation layer is responsible for presenting the data to the application layer
what is the application layer in the OSI model
The Application Layer is topmost layer
This layer allows users to interact with other software applications
This layer provides services which include: e-mail, transferring files, distributing results to the user.
what is the session layer in the OSI model
Layer 5 of the OSI Model
it controls the dialogues (connections) between computers.
It establishes manages, and terminates the connections between the local and remote application.
what is the transport layer in the OSI model
Layer 4 of the OSI Model
Transport Layer provides the transfer of data between end users
it provides reliable data transfer services to the upper layers
The transport layer controls links through flow control (flow control is the process of managing the rate of data transmission)
what is the physical layer OSI model
Layer 1 of The OSI Model
Physical Layer defines electrical and physical specifications for devices.
defines the relationship between a device and a transmission medium, such as a copper cable
This includes the layout of pins, voltages, cables, hubs, and any other physical elements of a network
what is data link OSI model
A data link is the means of connecting one location to another (data communication)
These are controlled by a link protocol enabling digital data to be transferred from a data source to a data sink (storage)
what is the network layer OSI model
The network layer is responsible for receiving packets from the data link layer,
it delivers them to their intended destinations based on the address it was given
The network layer finds the destination by using logical addresses, such as IP (internet protocol)
