Azdikamal.com Trusted Information and Education News Media
Introduction
IPv6 (Internet Protocol Version 6) is the latest version of the Internet Protocol, which is designed to replace IPv4. It provides a larger address space, improved security features, and better support for mobile devices. IPv6 addresses are 128 bits long, which is four times the length of IPv4 addresses. In this article, we will discuss which of the following are valid IPv6 addresses and how to recognize them.
What is an IPv6 Address?
An IPv6 address is a unique identifier that is assigned to every device connected to the internet. It consists of 128 bits, which are represented in hexadecimal format with colons separating every 16-bit block. An example of an IPv6 address is 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
What are Valid IPv6 Addresses?
Valid IPv6 addresses must follow a specific format. The first rule is that they must consist of eight 16-bit blocks separated by colons. Each block must contain four hexadecimal digits. However, leading zeros can be omitted from each block. For example, 2001:0db8:85a3:0000:0000:8a2e:0370:7334 can be written as 2001:db8:85a3:0:0:8a2e:370:7334.
Rule 1: Leading Zeros Can Be Omitted
As mentioned earlier, leading zeros can be omitted from each block. For example, 2001:0db8:85a3:0000:0000:8a2e:0370:7334 can be written as 2001:db8:85a3:0:0:8a2e:370:7334. This makes the address easier to read and remember.
Rule 2: Consecutive Blocks of Zeros Can Be Represented by a Double Colon
Another rule is that consecutive blocks of zeros can be represented by a double colon. For example, 2001:0db8:0000:0000:0000:0000:1428:57ab can be written as 2001:db8::1428:57ab. However, the double colon can only be used once in an IPv6 address. If there are multiple instances of consecutive blocks of zeros, only one can be replaced by a double colon.
Rule 3: The First Block Can Contain the Subnet ID and Interface ID
The first block of an IPv6 address can contain the subnet ID and interface ID. The subnet ID is used to identify the network, while the interface ID is used to identify the device on the network. For example, 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64 is an IPv6 address with a subnet ID of 2001:0db8:85a3:0000 and an interface ID of 8a2e:0370:7334.
Which of the Following are Valid IPv6 Addresses? Select Two
Now that we have discussed the rules for valid IPv6 addresses, let us look at which of the following are valid IPv6 addresses. Select two: 1. 2001:0db8:85a3:::8a2e:0370:7334 2. 2001:0db8:85a3:0000:0000:8a2e:0370:7334 3. 2001:0db8:85a3:0000:0000:8a2e:0370:73-34 4. 2001:0db8:85a3:0:0:8a2e:0370:7334/64 5. 2001:0db8:85a3:0000:0000:8a2e:0370: The first and second options are valid IPv6 addresses. The first option uses a double colon to represent consecutive blocks of zeros, while the second option omits the leading zeros. The third option is invalid because it contains a hyphen instead of a colon. The fourth option is valid because it includes the subnet ID and interface ID, but it is not a complete IPv6 address. The fifth option is invalid because it ends with a colon and does not have a complete last block.
Conclusion
In conclusion, IPv6 addresses are 128 bits long and follow a specific format. Valid IPv6 addresses consist of eight 16-bit blocks separated by colons. Leading zeros can be omitted, and consecutive blocks of zeros can be represented by a double colon. The first block can contain the subnet ID and interface ID. It is important to recognize valid IPv6 addresses to ensure that devices can connect to the internet and communicate with each other.
