Dynamic Host Configuration Protocol
DHCP

Dynamic Host Configuration Protocol (DHCP) is a protocol for assigning dynamic IP addresses to devices on a network. With dynamic addressing, a device can have a different IP address every time it connects to the network. In some systems, the device's IP address can even change while it is still connected. DHCP also supports a mix of static and dynamic IP addresses.

How does DHCP work.

DHCP is based on a client-server model and based on discovery, offer, request, and acknowledgment .DHCP port number for server is 67 and for the client is 68. It is a Client server protocol which uses UDP services. IP address is assigned from a pool of addresses. In DHCP, the client and the server exchange mainly 4 DHCP messages in order to make a connection, also called DORA process, but there are 8 DHCP messages in the process.

DORA is nothing but a sequence of messages which is exchanged between the DHCP Server and Client. DORA stands for mentioned messages :

·         Discover

·         Offer

·         Request

·         Acknowledgment

Now, take a look on this image. This image will clear the sequence of different messages which is used in DORA Process.

Advantages – The advantages of using DHCP include:

·         centralized management of IP addresses

·         ease of adding new clients to a network

·         reuse of IP addresses reducing the total number of IP addresses that are required

·         simple reconfiguration of the IP address space on the DHCP server without needing to reconfigure each client,The       DHCP protocol gives the network administrator a method to configure the network from a centralized area.

              With the help of DHCP, easy handling of new users and reuse of IP address can be achieved.

Top 10 Desktop Support Interview questions & Answers

Top 10 Desktop Support Interview questions & Answers

Q1- How to install operating system in USB Pen drive? 

Ans-
Step 1. Format the USB Flash Disk
Run CMD (elevated) and type:
1. diskpart
2. list disk (now find your USB disk number, you will find it by its size)
3. select disk 2 (if your USB is disk 2) 

4. clean
5. create partition primary
6. select partition 2 (this is 2, no matter what number is your USB disk)
7. active
8. format fs=fat32 (or ntfs, works with both)
9. assign
10. exit

Step 2. Copy Windows 10 or Windows 8 DVD content to the Flash Disk

Q2- How to set the IP address by using the command prompt? 

Ans- 

There are Two ways to Set the IP address from CMD Prompt
1. Go to start, select run, type CMD, and in CMD Prompt type the command 

C:>netsh interface ip set address name="Local Area Connection" source=dhcp

2.Go to start, select run, type CMD, and in CMD Prompt type the command
C:>netsh interface ip set address local static 192.168.10.100 255.255.255.0 192.168.10.20

Q3- What is the technical difference between Desktop Support & Help Desk? 

Answer:- 

The difference between desktop support and helpdesk are the following:
1. Desktop support is the one doing the troubleshooting on hand.
2. Helpdesk support is the one receiving the call and troubleshoot it remotely 

Q4- What is LDAP Server? 

Answer:- 

LDAP, Lightweight Directory Access Protocol, is an Internet protocol that email and other programs use to look up information from a server. 

Q5-What is Bluescreen? What would you do if your PC turns into Bluescreen? 

Answer:- 

major problem is RAM first check with ram then go to safe mode scan your PC by using antivirus at the same time update drivers it should be mother board supported drivers or else use recommended software 

Q6-What is UAC (User Account control)? 

Answer:- 

user account control setting is a tools for administration that raise & alert if you modify the privilege of administrator.user account control protect your computer from malicious software because it allow user to notice when a document & program trying access. 

Q7-What is HOSTS? 

Answer:- 

The "HOSTS" file contains entries that simulate "A" records in DNS (and PTR records, too). Only DNS-legal names are allowed in this file. 

Q8-You are required to install a new printer on the Print Server what are your steps? Remember this will be a shared printer? 

Answer:- 

First Start--->Control Panel--->Printers---->Add printer--->Local (or) Network Printer--->Choose which brand printer and which one type of printer
(if it's needed drivers, push the driver CD in that PC)---->Select TYPE (LPT1 or USB)--->Finish. It's ready to use printer. now printer is online. 

Q9-Suppose there are a couple of way to view and disable the items that start to the task pain, how would you go about doing it and give me the full path to get you there? 

Answer:- 

To see the most start up item,
Go to start>programm>start up
To make any changes, enable or disable Go to Run & type "msconfig" 

Q10-What is difference between MSI and EXE file? 

Answer:- 

AN msi is an installer, uninstaller and program repairer, it performs all those functions. The same file that installs the program also uninstalls it and if the programs detects missing files or corrupt settings the msi repairs it. When you install a program with an msi, a copy of it or a near copy is also installed somewhere so that the program is always able to be repaired without you having to really do anything.
C:Windows Installer is one of the folders where back-up msi are kept. If you have a choice choose msi.