IP 6 Flashcards
How large is IPv6’s address space?
IPv6 has a larger 128-bit address space, providing 340 undecillion
(i.e., 340 followed by 36 zeroes) possible addresses.
The IETF has created various protocols and tools to help network administrators migrate their networks to IPv6. What are the 3 categories of migration techniques?
- Dual Stack
- Tunneling
- Translation
How does Dual Stack work in a network?
Dual stack allows IPv4 and IPv6 to coexist on the same network segment. Dual stack devices run both IPv4 and IPv6 protocol stacks simultaneously. Known as native IPv6, this means the customer network has an IPv6 connection to their ISP and is able to access content found on the internet over IPv6.
How does Tunneling work to allow an IPv4 subnet to communicate with an IPv6 subnet?
Tunneling is a method of transporting an IPv6 packet over an IPv4 network. The IPv6 packet is encapsulated inside an IPv4 packet, similar to other types of data. The router between the two segements would be dual stack, while each segment would be single stack.
How does Translation work in allowing an IPv4 only
subnet to communicate with an IPv6 only subnet?
Network Address Translation 64 (NAT64) allows IPv6-enabled devices to communicate with IPv4-enabled devices using a translation technique similar to NAT for IPv4. An IPv6 packet is translated to an IPv4 packet and an IPv4 packet is translated to an IPv6 packet.
What format (system) is utilized to represent an IPv6 address?
Hexidecimal
0-9 and A-F for each location within an IPv6 address
How many bits are represented in an IPv6 address?
128 bits - Every four bits is represented by a single hexadecimal digit; for a total of 32 hexadecimal values, as shown in the figure. IPv6 addresses are not case-sensitive and can be written in either lowercase or uppercase.
What is the preferred format for writing an IPv6 address?
The preferred format for writing an IPv6 address is x:x:x:x:x:x:x:x, with each “x” consisting of four hexadecimal values. The term octet refers to the eight bits of an IPv4 address. In IPv6, a hextet is the unofficial term used to refer to a segment of 16 bits, or four hexadecimal values. Each “x” is a single hextet which is 16 bits or four hexadecimal digits.
When writing IPv6 addresses, what is the first rule for formatting addresses being written?
First Rule: Leading Zeros in any 16-bit segment (hextet) do not have to be written.
When writing IPv6 addresses, what is the second rule for formatting addresses being written?
Second Rule: Any single, contiguous string of one or more 16-bit segments consisting of all Zeroes can be represented with a couble colon (::).
What is the addition to Rule 2 regarding the double colon ::?
If an address has more than one contiguous string of all -0 hextets, best practice is to use the double colon (::) on the longest string. Notice that this double colon represents 3 hextets.
