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The Bits and Bytes of Computer Networking > IPv6 > Flashcards

IPv6 Flashcards

1
Q

How many bits are IPv6 addresses?

A

128 bits

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2
Q

How are IPv6 addresses wrotten out?

A

As 8 groups that are 16 bits each and made up of 4 hexadecimal numbers

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3
Q

What does the IPv6 address reserved for educational documentation begin with?

A

2001:0d68

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4
Q

What are the 2 rules for shortening IPv6 addresses?

A
  1. you can remove any leading zeros from a group

2. any # of consecutive groups composed 0s can be replaced by 2 colons

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5
Q

What’s the loopback address for IPv6 addresses?

A

31 0s with a 1 at the end

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6
Q

What is the condensed loopback address?

A

::1

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7
Q

What’s the multicast address?

A

FF00::

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8
Q

What’s the link-local unicast address?

A

FE80::

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9
Q

Which portion of IPv6 addresses is reserved for the network ID?

A

the first 64 bits

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10
Q

Which portion of IPv6 addresses is reserved for the host ID?

A

the second 64 bits

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11
Q

Describe link-local unicast.

A

It allows for local network communications and are configured based upon a host’s MAC address.

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12
Q

Describe how MAC addresses are configured for link-local unicast.

A

It’s used by IPv6 addresses to receive their configuration (like DHCP for IPv4). The host MAC address is run though an algorithm to turn it from a 48-bit # to a unique 64-bit number that’s inserted into the address’s host ID.

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13
Q

What do IPv4 mapped address spaces begin with?

A

80 zeros that are followed by 16 ones

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14
Q

What does an IPv4 mapped address space end with?

A

The same 32 bits of the IPv4 address it’s meant to represent.

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15
Q

What do IPv4 mapped address spaces allow for?

A

A way for IPv4 traffic to travel over an IPv6 network.

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16
Q

List the order of IPv6 header fields.

A

Version, traffic class, flow label field, payload length, next header, hop limit, source and destination addresses, header specified in next header field (if applicable), data payload

17
Q

what’s the primary way IPv6 traffic travels over IPv4 networks/the backbone of the Internet?

A

IPv6 tunnels

18
Q

Describe IPv6 tunnels.

A

IPv6 tunnel servers that are on both sides of a connection take incoming IPv6 traffic and encapsulate it within traditional IPv4 datagrams. This is then delivered across the IPv4 Internet space where it’s received by another IPv6 tunnel that de-encapsulates and passes the IPv6 traffic further along in the network.

19
Q

what are IPv6 tunnel brokers?

A

companies that provide IPv6 endpoints for you so you don’t have to introduce additional equipment to you network.

The Bits and Bytes of Computer Networking (5 decks)

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