1. Can a machine with a single DNS name have multiple IP addresses? If yes then how could this occur?

yes it can happen. DNS, the Domain Name Service, as you would know, is used to help us resolve Fully Qualified Domain Names (FQDN) to IP addresses. There are different versions of DNS systems running all over the Internet, mainly ranging between Windows (which use the Windows DNS server) and Linux/Unix (using BIND DNS services). Considering there are some very popular Web sites which serve millions of DNS queries per day e.g., Google.com, Hotmail.com, it is logical that these domain names cannot solely rely on one single DNS server, cause if that fails, the whole domain could become unreachable! It is, for this reason, a fault-tolerant DNS service is put in place, which shares the DNS queries amongst several different DNS servers. All servers are configured to either randomly provide clients with IP addresses from a specific pool, or -- by using a round robin method -- cycle between the pool of IP addresses. This is what gives a DNS name multiple IP addresses.

2. Explain what is file system? How a file is organized in file system? Give few examples?

File system is depending on Operation systems & hard Disk sizes.At the time 1990 there were only dos which supports only FAT16 (File allocation table)Upto MS-DOS 6.22 & Windows 3.1 & 3.11 It works only on FAT16FAT16 Has it's limitation that it can't support more than 2.1 GB partition at a time.After that windows 95 & Windows 98That supported FAT16 & FAT32 only. Windows NT supports FAT16 as well as It develops new file systems HPFS i.e. (High Performance File System)
Later i.e. is called as NTFS (New Technology File System)NTFS is now a largest support for us.

3. Tell me what is a VLAN? What does VLAN provide?

Short for virtual LAN, a network of computers that behave as if they are connected to the same wire even though they may actually be physically located on different segments of a LAN VLANs are configured through software rather than hardware, which makes them extremely flexible. One of the biggest advantages of VLANs is that when a computer is physically moved to another location, it can stay on the same VLAN without any hardware reconfiguration.

4. How to recover deleted file from network?

It remains in the recycler on the drive or partions the held that data untill it is overwriten. To view the recycler you must allow hiden system files to be shown (in Windows this can be done under folder options). There are tool available to recover the deleted data. I recently have used a program call "Recover My files".

5. Explain what is difference between ARP and RARP?

The address resolution protocol (ARP) associates an IP address with the physical address. On a typical physical network (eg: LAN) each device on a link is identified by a physical or station address usually imprinted on the network interface card(NIC)Physical addresses can be changed easily, on the other hand IP addresses cannot be changed. ARP is used to find the physical address of the node when its internet address is known.
The reverse address resolution protocol(RARP) allows host to discover its internet address when it known only its physical address. RARP works much like ARP.
To obtain IP address the host first broadcasts an RARP request packet containing its MAC address on the network. All hosts on the network receive the packet, but only the server replier to the host by sending an RARP response packet containing the host's MAC and IP addresses. One limitation with RARP is that the server must be located on the same physical network as the host

6. What is difference between TCP protocol& UDP protocol?

The difference between TCP and UDP is connection(TCP) and connectionless(UDP) protocol.Because In TCP for transferring every Packets it needs a acknowledgement packet from reciever ,so if any packet loss happens reciver will not send a acknowledge ment for that packet so Transmitter will once again send the packet.so TCP is reliable connection unless UDP will send a packet and will not expect any acknowledgment from the reciever so it is not reliable.

7. What do you need to know to set up a network?

First u need to specify your network size. Since the network eqiuipments depend upon your sixeeg:
Small network u could use as a l2 switch large network a l3/managed switch.
Same goes for routers and Wan connection.Servers:
1.Active Domain Controller
2.Back up Domain Controller.
3.Dhcp server.
4.Software Update services.
Hope this would suffice...

8. Explain Full form of SATA hard disk?

Serial Advanced Technology Attachment ( is a computer bus primarily designed for transfer of data between a computer and mass storage devices such as hard disk drives and optical drives.The main advantages over the older parallel ATA interface are faster data transfer, ability to remove or add devices while operating (hot swapping), thinner cables that let air cooling work more efficiently, and more reliable operation with tighter data integrity checks.

9. How to share a printer?

This is how I share a printer on a the LAN You can print from every PC on your network to one printer. To share a printer with the other PCs in your home you need to configure the PC to which the printer is connected and then install the shared printer on each PC that you want to print from.If you have not already done so, set-up and install the printer onto a PC following the manufacturer's instructions.The following instructions will vary slightly depending on which version of Windows you are using.1. Turn on all of the PCs on your network and turn on the printer.2. Start with the PC to which the printer is connected. Click Start, Settings, Control Panel, Printers.3. In the Printers window, right click on the printer that you want to share on the network and choose "Sharing" from the menu.4. If this is the first time anything has been set-up for sharing on this PC, you may receive a security warning. In the security message, click on "Just enable printer sharing" and then click "OK". Otherwise click on "Share this printer".5. Enter a share name, something like "Laser printer in office". 6. Now click "OK".