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Thursday, July 29, 2021

What is commonly used to convert DHCP broadcast messages to unicast messages and forward them to DHCP servers on a separate subnet?

What is commonly used to convert DHCP broadcast messages to unicast messages and forward them to DHCP servers on a separate subnet?

  • DHCP Relay Agent
  • DHCP Reservation
  • DHCP Filter
  • DHCP Forwarder         

What is commonly used to convert DHCP broadcast messages to unicast messages and forward them to DHCP servers on a separate subnet?


EXPLANATION

Generally, DHCP messages are broadcasted. So, in order for the messages to be exchanged between a DHCP client (PC) and DHCP server, both the client and server have to reside on the same subnet. That is because routers do not forward any broadcast IP packet (i.e. one with a destination MAC address of FF:FF:FF:FF:FF:FF and a destination IP address of 255.255.255.255) to other interfaces. Thus, a broadcast DHCP packet sent by a DHCP client cannot be delivered to DHCP server(s) on different subnet(s) through a router.

To address this problem, the concept of a DHCP relay agent has long been adopted.  The core function of this DHCP relay agent is to convert broadcast DHCP packets into unicast messages and then forward them to DHCP servers


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Tuesday, July 27, 2021

Which version of Windows introduced the Metro user interface, which can be used on desktops, laptops, mobile phones, and tablets?

Which version of Windows introduced the Metro user interface, which can be used on desktops, laptops, mobile phones, and tablets?

  • Windows XP
  • Windows 8
  • Windows 7
  • Windows Vista           
Which version of Windows introduced the Metro user interface, which can be used on desktops, laptops, mobile phones, and tablets?


EXPLANATION

Metro is a new “design language” of Microsoft. A new concept aimed at changing the logic of construction and work of the operating system and applications, as well as the scheme of interaction between the user and the electronic device.

The basic principles of construction and appearance were largely borrowed from the information systems of transport nodes. The inscriptions and graphical elements in these systems are subject to quite specific requirements: very high readability and visual perceptibility of information, absence of unnecessary distractions, clean and clear view of all external elements.


SOURCE

https://designmodo.com/metro-ui/
    
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Which category cabling is theoretically the fastest and recommended for use in VOIP where throughput of greater than 100Mbps is desired?

Which category cabling is theoretically the fastest and recommended for use in VOIP where throughput of greater than 100Mbps is desired?

  • CAT-5
  • CAT-3
  • CAT-5a
  • CAT-6              

Which category cabling is theoretically the fastest and recommended for use in VOIP where throughput of greater than 100Mbps is desired?


EXPLANATION

CAT-6 cabling should be used where throughput of greater than 100Mbps is desired.

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Which of the following is the default port used for POP3 SSL Traffic?

Which of the following is the default port used for POP3 SSL Traffic?

  • 110
  • 25
  • 995
  • 587          
Which of the following is the default port used for POP3 SSL Traffic?


EXPLANATION

POP uses port 110, but SSL/TLS encrypted POP uses port 995.

SOURCE

https://www.fastmail.com/help/technical/ssltlsstarttls.html 
     
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A 17xx POST error code indicates a problem with the which of the following?

A 17xx POST error code indicates a problem with the which of the following?

  • System Board
  • Video
  • RAM or ROM
  • Hard Drive       

A 17xx POST error code indicates a problem with the which of the following?


EXPLANATION

Hard Drive or Controller Explanation Error codes beginning with 17 (17xx) relates to issues of the HDC.  

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Friday, July 23, 2021

In Linux, which of these is the final step for installing software from a source file using the terminal?

In Linux, which of these is the final step for installing software from a source file using the terminal?

  • install pkg
  • sudo install <path>
  • make install
  • ./configure          

In Linux, which of these is the final step for installing software from a source file using the terminal?


EXPLANATION

Steps are as follows:

1. Unzip file

2. Navigate to it within the terminal using cd

3. Type './configure'

4. Type 'make'

5. Type 'make install'


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Which of the following protocols is not supported natively in Windows?

Which of the following protocols is not supported natively in Windows?

  • SMB
  • FTP
  • NFS
  • AFP 

Which of the following protocols is not supported natively in Windows?


EXPLANATION

So, assuming that your PC and Mac are both sitting comfortably on your network, wirelessly or otherwise (if you haven't gotten that far, you need more help than I'll be providing right here), there are a couple of different ways for the various machines on your network to talk to each other and share files. Think of 'em sorta like languages.

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