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What is the difference between MBR and GPT?

October 22, 2014 by @HKw@! | No Comments | Filed in Windows

I believe most of the IT folks see this two type of partition table format (MBR and GPT) when you creating new partition. But do your guy really understand what is the difference between this two partition table format?

Here i going to share with you some of the key difference between this two partition table format:-

 Master Boot Record (MBR)

  • A partition supports a maximum of four primary partitions per drive
  • A partition can have maximum of 2 terabytes (TB) (2.19 x 10^12 bytes).

Note: You can use the MBR partition table format for disk drives that never surpass 2 TB in size. This provides you with a bit more space, because GPT requires more disk space than MBR.

GUID Partition Table (GPT)

  • GPT supports a maximum of 128 partitions per drive
  • A partition can have up to 18 exabytes (EB).

Note: If your hard disk is larger than 2 TB, you must use the GPT partition table format. To boot from a GPT partition table, please make sure your BIOS able  support GPT.

Differences Between IPv4 and IPv6

October 18, 2014 by @HKw@! | No Comments | Filed in Networking

Below are the some difference between IPv4 and IPv6:-

IPv4 IPv6
Address Resolution Protocol (ARP) uses broadcast ARP request frames to resolve an IPv4 address to a link-layer address. ARP request frames are replaced with multicast Neighbor Solicitation messages.

Internet Group Management Protocol (IGMP) manages local subnet group membership.

IGMP is replaced with Multicast Listener Discovery messages.

Internet Control Message Protocol (ICMP) Router Discover, which is optional, determines the IPv4 address of the best default gateway.

ICMP Router Discovery is replaced with required ICMPv6 Router Solicitation and Router Advertisement messages.

Uses host (A) resource records in the DNS to map host names to IPv4 addresses.

Uses IPv6 host (AAAA) resource records in DNS to map host names to IPv6 addresses.

Uses pointer (PTR) resource records in the IN-ADDR.ARPA DNS domain to map IPv4 addresses to host names.

Uses pointer (PTR) resource records in the IP6.ARPA DNS domain to map IPv6 addresses to host names.

Must support a 576-byte packet size (possibly fragmented).

Must support a 1280-byte packet size (without fragmentation).

Troubleshooting DNS issue with Nslookup command

October 18, 2014 by @HKw@! | No Comments | Filed in DNS, Linux, Mac OS X, Unix, Windows

When troubleshooting DNS problem, Nslookup is used to perform DNS queries and to examine the contents of zone files on local and remote servers.

Nslookup is a standard command-line tool which available on Windows, Linux and Mac OS platform. Nslookup offers you the ability to perform query testing of DNS servers and to obtain detailed responses at the command prompt.

To use nslookup in command-line mode, enter the following in the command prompt window:

nslookup DNS_name_or_IP_address server_IP_address

This command will look up a DNS name or address using a server at the IP address you specify.”

Here i going to show few examples on using the nslookup command. Read the rest of this entry »