IPv6 Flashcards
What is the effect of an increasing demand of Internet of Things?
The Internet of Things is increasing the demand for internet protocol addresses as more devices join the network.
How long are IPv4 addresses?
32 bits or 4 bytes
What is the problem with IPv4 addresses?
They are all gone,
There are not enough IPv4 addresses for all the devices in the world, to meet demand.
When were the IPv4 addresses officially exhausted?
October 2015 the American Registry for Internet Numbers announced.
What is NAT?
Network Address Translation
What does NAT do?
It allows many machines to have the same public IP address.
The NAT box maps many ‘inside’ addresses to a single outside’ address, using port numbers to resolve ambiguity.
NAT boxes usually do the firewalling.
What are the 3 qualities of IPv6?
Larger address space
Built-In Security
Jumbograms
What is CIDR?
Complementary Internet Domain Routing
Divides IP addresses by non-byte boundaries.
How big is a IPv6 address and how is it divided?
The 128-bit IPv6 address is divided (anywhere) into:
∙ a prefix identifying a network;
∙ a suffix identifying a computer on that network.
Divided into Network and Host
How many IPv6 addresses are there?
The IPv6 address space allows for approximately 2^52 addresses for every observable star in the known universe.
How big is a IPv6 address in words?
Eight 16 bit words long.
How is Built-In Security achieved?
Every IPv6 packet has a fixed header, some optional
headers and a payload (data).
The fixed header is always present. Contains things like payload length, addresses.
Having optional headers enables encryption and expandability.
What would an optional authentication header for an IPv6 address have?
An optional authentication header has:
1) a Security Parameters Index (SPI) for encryption;
2) some Authentication Data for signing.
What is a jumbogram?
An IPv6 jumbogram allows packets larger than 2^16 bytes, up to 2^32 bytes.
You use them when you know there is a very low chance of network failure.
