Which of the following mnemonicss can be used to remember the order of the OSI layer levels ?

Which of the following mnemonicss can be used to remember the order of the OSI layer levels ?

• Please Don't Say Anything No Talking Period.
• Please Do Not Throw Sausage Pizza Away
• Not All People Pretend Talk Scooby Doo
• Don't Stick Apple Pips To Peoples Noses 

EXPLANATION

Application Set

• Layer 7: Application - This is the layer that actually interacts with the operating system or application whenever the user chooses to transfer files, read messages or perform other network-related activities.
• Layer 6: Presentation - Layer 6 takes the data provided by the Application layer and converts it into a standard format that the other layers can understand.
• Layer 5: Session - Layer 5 establishes, maintains and ends communication with the receiving device.

Transport Set

• Layer 4: Transport - This layer maintains flow control of data and provides for error checking and recovery of data between the devices. Flow control means that the Transport layer looks to see if data is coming from more than one application and integrates each application's data into a single stream for the physical network.
• Layer 3: Network - The way that the data will be sent to the recipient device is determined in this layer. Logical protocols, routing and addressing are handled here.
• Layer 2: Data - In this layer, the appropriate physical protocol is assigned to the data. Also, the type of network and the packet sequencing is defined.
• Layer 1: Physical - This is the level of the actual hardware. It defines the physical characteristics of the network such as connections, voltage levels and timing.

SOURCE

https://computer.howstuffworks.com/osi1.htm

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What TCP port is SFTP or Secure File Transfer Protocol commonly used on?

What TCP port is SFTP or Secure File Transfer Protocol commonly used on?

• 22
• 21
• 7777
• 69 

 

EXPLANATION

Secure File Transfer Protocol is commonly placed on 22 as it is also known as File Transfer Protocol on SSH. Not to be confused with File Transfer Protocol over TLS/SSL or FTPS, as there are no answers for ports 989 or 990.
 For more information, see:
https://support.apple.com/en-us/HT202944
https://www.infobyip.com/tcpportchecker.php

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In Windows Server, which command line command can you use to determine your logon server?

In Windows Server, which command line command can you use to determine your logon server?

• ipconfig /logonserver
• find /logon_server
• echo %logonserver%
• echo %logon_server% 

EXPLANATION

the DC you use as the logonserver may be one of several in the domain. Your PC will determine the “best” DC to use based on how your AD sites are setup.
If you are in a situation where you need to discover which DC the PC you're using has used to logon you can do this using the echo %logonserver% cmd.

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You are the administrator for a large company that has purchased a new multifunction printer. You want to publish the printer to Active Directory. Where is one possible place would you click in order to accomplish this task?

You are the administrator for a large company that has purchased a new multifunction printer. You want to publish the printer to Active Directory. Where is one possible place would you click in order to accomplish this task?

• The Printing Preferences button
• The Advanced Tab
• The Device Settings Tab
• The Sharing Tab 

EXPLANATION

You will need to go to the Sharing Tab and then checkmark "List in directory" and then hit apply. This will then publish it to the AD.

You need to publish shares in the directory before they are available to the users of the directory. If NetBIOS is still enabled on the network, the shares will be visible to the NetBIOS tools and clients, but you do not have to enable NetBIOS on shares. Although replication must occur before the shares are available in the directory, it is unlikely that the replication will not have occurred by the next day. If this is the case, then you have other problems with the directory as well.

SOURCE

http://windowsitpro.com/systems-management/how-can-printer-be-listed-active-directory

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What is the standard command for a modem to answer?

What is the standard command for a modem to answer?

• AT DT
• AT A
• A/
• AT Z 

 

EXPLANATION

Modem Command strings are prefixed with "AT" to get the modem's "attention".  A is the code for "Answer".  This typically requires no Carriage Return to follow, as that is interpreted by the
modem as a cancellation.  AT Z resets the modem, AT DT Dials touch tone (usually the default dialing method), and A/ repeats the last command.

SOURCE

https://en.wikipedia.org/wiki/Hayes_command_set

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Which of the below is an Android Operating System

Which of the below is an Android Operating System

• Oreo
• Rich Tea
• Custard Cream
• Digestive

EXPLANATION

It contains a number of major features, including notification grouping, picture-in-picture support for video, performance improvements and battery usage optimization, and support for autofillers, Bluetooth 5, system-level integration with VoIP apps, wide color gamuts, and Wi-Fi Aware. Android Oreo also introduces two major platform features: Android Go – a software distribution of the operating system for low-end devices – and support for implementing a hardware abstraction layer. 

  Android "Oreo" is the eighth major release and the 15th version of the Android mobile operating system. It was first released as an alpha quality developer preview in March 2017 and released to the public on August 21, 2017. 

SOURCE

https://en.wikipedia.org/wiki/Android_Oreo

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The name given to simultaneous data transfer to targeted network connected devices, this method generally reduces load on the clients

The name given to simultaneous data transfer to targeted network connected devices, this method generally reduces load on the clients

• Unicast
• Multicast
• Broadcast
• Scattercast 

 

EXPLANATION

Unicast: traffic, many streams of IP packets that move across networks flow from a single point, such as a website server, to a single endpoint such as a client PC. This is the most common form of information transference on networks.

Broadcast: Here, traffic streams from a single point to all possible endpoints within reach on the network, which is generally a LAN. This is the easiest technique to ensure traffic reaches to its destinations.
This mode is mainly utilized by television networks for video and audio distribution. Even if the television network is a cable television (CATV) system, the source signal reaches to all possible destinations, which is the key reason that some channels’ content is scrambled. Broadcasting is not practicable on the public Internet due to the massive amount of unnecessary data that would continually reach at each user’s device, the complications and impact of scrambling and related privacy issues.
Multicast: In this method traffic recline between the boundaries of unicast (one point to one destination) and broadcast (one point to all destinations). And multicast is a “one source to many destinations” way of traffic distribution, means that only the destinations that openly point to their requisite to accept the data from a specific source to receive the traffic stream.

SOURCE

https://www.esds.co.in/blog/difference-between-unicast-broadcast-and-multicast/#sthash.sqHC51wG.dpbs

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