Which of the following is included in a BYOD (Bring Your Own Device) policy document?
- Data ownership
- Transitive trust
- Credential management
- Key management
Which of the following is included in a BYOD (Bring Your Own Device) policy document?
Thursday, May 23, 2019
In which network topology does every node connect independently to one central unit?
In which network topology does every node connect independently to one central unit?
- Bus
- Mesh
- Star
- Ring
EXPLANATION
Star network a data or communication network in which all nodes are independently connected to one central unit
What is Star Topology?
A star topology is a network topology in which all the network nodes are individually connected to a central switch, hub or computer which acts as a central point of communication to pass on the messages.In a star topology, there are different nodes called hosts and there is a central point of communication called server or hub. Each host or computer is individually connected to the central hub. We can also term the server as the root and peripheral hosts as the leaves.
In this topology, if nodes want to communicate with a central node, then they pass on the message to the central server and the central server forwards their messages to the different nodes. Thus, they form a topology like the representation of a star.
How does communication happen in a Star topology?
Let’s say all the computers of a floor are connected to a common hub or switch. The switch maintains a CAM table in this case. The CAM table is Content Addressable Memory where hardware addresses of the all the connected devices are stored inside a memory in the switch.For example, if computer A wants to send a data packet to computer B then computer A will forward the message to the switch. The switch will check the address of the destination computer and forward the message to the same.
In the case of a hub, a hub has no memory of its own. So when computer A sends a message to computer B, then hub announces “Hello all the ports connected to me, I have got a packet for this address. Who of you has this address?” This procedure is called ARP (Address Resolution Protocol) and using this network protocol the hub is able to find the address of the intended machine and hence, it transfers the packet to the destination machine.
Advantages of Star Topology:
- Less damage in case of a single computer failure as it does not affect the entire network
Disadvantages of Star topology:
- More cables are required to be connected because each computer individually connects to the central server
- Single point of failure in case the server get down.
Wednesday, May 22, 2019
Which PowerShell command should you use to get help with other commands?
Which PowerShell command should you use to get help with other commands?
- Get-Help
- /?
- -help
- -?
EXPLANATION
The Get-Help cmdlet displays information about PowerShell concepts and commands, including cmdlets, functions, CIM commands, workflows, providers, aliases and scripts. To get help for a PowerShell command, type Get-Help followed by the command name, such as: Get-Help Get-Process.
Displays information about PowerShell commands and concepts.
Syntax
PowerShell
Get-Help
[[-Name] <String>]
[-Path <String>]
[-Category <String[]>]
[-Component <String[]>]
[-Functionality <String[]>]
[-Role <String[]>]
[-Full]
[<CommonParameters>]What does GPO stand for?
What does GPO stand for?
- Great Power Outage
- Group Policy Object
- Group Policy Overwrite
- Group Policy Output
EXPLANATION
A GPO when referring to Microsoft Technologies is short for a Group Policy Object. A Group Policy Object is a Policy object that is saved into Active Directory that can be applied to Users of Computers. The object itself has a list of settings that can be configured by an IT Administrator and then periodically (normally every 90 minutes) gets re-applied to the computer.
Monday, May 20, 2019
Layer 4 in the OSI model corresponds to which of the following?
Layer 4 in the OSI model corresponds to which of the following?
- Network layer
- Transport layer
- Physical layer
- Presentation layer
EXPLANATION
Transport layer
The Transport layer is also called as the layer 4 of the OSI model. Here are the basic functionalities of the Transport layer:- Responsible for the transparent transfer of data between end systems
- Responsible for end-to-end error recovery and flow control
- Responsible for complete data transfer.
- Protocols like SPX, TCP, UDP work here
The OSI model consists of how many layers?
The OSI model consists of how many layers?
- 7
- 6
- 5
- 8
EXPLANATION
The 7 Layers of the OSI
In the OSI model, control is passed from one layer to the next, starting at the application layer (Layer 7) in one station, and proceeding to the bottom layer, over the channel to the next station and back up the hierarchy. The OSI model takes the task of inter-networking and divides that up into what is referred to as a vertical stack that consists of the following 7 layers.Note: Click each hyperlink in the list below to read detailed information and examples of each layer or continue scrolling to read the full article:
- Layer 7 - Application
- Layer 6 - Presentation
- Layer 5 - Session
- Layer 4 - Transport
- Layer 3 - Network
- Layer 2 - Data Link
- Layer 1 - Physical
In Linux, the rmdir command (without any flags):
In Linux, the rmdir command (without any flags):
- Removes a directory and its contents
- Removes empty directories
- Removes a directory and all of its subdirectories
- Remotely creates a directory
EXPLANATION
rmdir
Remove directory, this command will only work if the folders are empty.Syntax
rmdir [options]... folder(s)...
Options
--ignore-fail-on-non-empty
Ignore each failure that is solely because the
directory is non-empty.
-p, --parents Remove explicit parent directories if being emptied
--verbose Output a diagnostic for every directory processed
--help Display help and exit
--version Output version information and exit
Example
$ rmdir myfolder
Before removing directories with a wildcard, it's wise to list them first:
$ ls -d britney*/
