Topic 7

Question 1

what is fault tolerance

Answer 1

Fault Tolerance simply means a system’s ability to continue operating uninterrupted despite the failure of one or more of its components.

Question 2

what are magnetic devices

Answer 2

Magnetic devices are components for creating, manipulating or detecting magnetic fields. .
Hard drives are magnetic devices

Question 3

what is raid 0

Answer 3

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

Question 4

what is raid 1

Answer 4

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

Question 5

what is raid 5

Answer 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.

Question 6

what is raid 6

Answer 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.

Question 7

what is raid 10

Answer 7

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.

Question 8

what is the difference between UDP and TCP?

Answer 8

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.

Question 9

what does UDP stand for

Answer 9

User datagram protocol

Question 10

what does TCP stand for

Answer 10

transmission control protocol

Question 11

what is defragmentation

Answer 11

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.

Question 12

what are the 7 OSI model layers (please do not throw sausage pizza away)

Answer 12

Physical

Data Link

Network

Transport

Session

Presentation

Application

Question 13

what are the 6 network topologies (string beans run through my house)

Answer 13

Star Topology
Bus Topology
Ring Topology
Tree Topology
Mesh Topology
Hybrid Topology

Question 14

what does OSI stand for

Answer 14

Open Systems Interconnection

Question 15

what is the presentation layer in the OSI Model

Answer 15

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

Question 16

what is the application layer in the OSI model

Answer 16

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.

Question 17

what is the session layer in the OSI model

Answer 17

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.

Question 18

what is the transport layer in the OSI model

Answer 18

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)

Question 19

what is the physical layer OSI model

Answer 19

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

Question 20

what is data link OSI model

Answer 20

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)

Question 21

what is the network layer OSI model

Answer 21

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)