IPv6 Addressing and Compression Techniques

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Questions and Answers

Which IPv6 address type cannot be routed outside of its subnet?

Global unicast address

Link-local address (correct)

Loopback address

Unique local address

What is required for an IPv6-enabled router interface at a minimum?

A self-generated loopback address

A global unicast address

An IPv4 address

A link-local IPv6 address (correct)

How many bits can be used for subnetting if your organization has been assigned a /48 IPv6 prefix?

16 bits (correct)

8 bits

64 bits

32 bits

What is the most compressed form of the IPv6 address 2001:0db8:0000:abcd:0000:0000:0000:0001?

2001:db8:0:abcd::1 Signup and view all the answers

What parts compose an IPv6 global unicast address?

Global routing prefix, subnet ID, and interface ID Signup and view all the answers

What does a successful ping to the IPv6 address ::1 indicate?

IP is properly installed on the host Signup and view all the answers

Which of the following is NOT true about IPv6 addresses?

IPv6 uses broadcast addresses similar to IPv4. Signup and view all the answers

What is the purpose of the interface ID in an IPv6 global unicast address?

To uniquely identify the local host on the network Signup and view all the answers

What is the valid most compressed format possible of the IPv6 address 2001:0DB8:0000:AB00:0000:0000:0000:1234?

2001:DB8:0:AB00::1234 Signup and view all the answers

What is the prefix associated with the IPv6 address 2001:DB8:D15:EA:CC44::1/64?

2001:DB8:D15:EA::/64 Signup and view all the answers

What type of address is automatically assigned to an interface when IPv6 is enabled on that interface?

Link-local Signup and view all the answers

Which IPv6 network prefix is only intended for local links and cannot be routed?

FE80::/10 Signup and view all the answers

What is the purpose of the command ping ::1?

It tests the internal configuration of an IPv6 host. Signup and view all the answers

What is the interface ID of the IPv6 address 2001:DB8::1000:A9CD:47FF:FE57:FE94/64?

1000:A9CD:47FF:FE57:FE94 Signup and view all the answers

What is the network address for the IPv6 address 2001:DB8:AA04:B5::1/64?

2001:DB8:AA04:B5::/64 Signup and view all the answers

Study Notes

IPv6 Address Compression

IPv6 addresses can be compressed by removing leading zeros within each hextet and replacing consecutive zero hextets with a double colon (::) only once.
Example: 2001:0DB8:0000:AB00:0000:0000:0000:1234 compresses to 2001:DB8:0:AB00::1234

IPv6 Prefix and Addresses

A /64 prefix in an IPv6 address means the first 64 bits represent the network portion.
Example: 2001:DB8:D15:EA:CC44::1/64 has a network prefix of 2001:DB8:D15:EA::/64.

Automatic IPv6 Address Assignment

When IPv6 is enabled, an interface automatically receives a link-local address (starting with FE80).

Link-Local IPv6 Addresses

FE80::/10 prefix is reserved for link-local addresses, which are not routable beyond the local network.

IPv6 Loopback Address

::1 is the IPv6 loopback address; pinging it checks the local IPv6 host's internal configuration.

IPv6 Interface ID

The interface ID in an IPv6 address is the suffix following :: and is part of the last 64bits when a /64 prefix is used. For Instance, the interface ID in 2001:DB8::1000:A9CD:47FF:FE57:FE94/64 is 1000:A9CD:47FF:FE57:FE94

IPv6 Network Address

The network address for an IPv6 address with a /64 prefix is the address formed by the first 64 bits, followed by zero hextets. For example, the network address for 2001:DB8:AA04:B5::1/64 is 2001:DB8:AA04:B5::/64.

IPv6 Address Types

IPv6 does not support broadcast addresses.
Instead, IPv6 uses multicast addresses for similar purposes.
A global unicast address is assigned by the Internet provider.
A subnet ID allows segmentation within an organization's internal network.

Minimum IPv6 Router Configuration

The minimum configuration for an IPv6 router interface is a link-local address.

Required IPv6 Address

A link-local address (FE80::/10) is mandatory on every IPv6-enabled interface.

IPv6 Global Unicast Address Parts

A global unicast address typically consists of a global routing prefix (provider-assigned), a subnet ID (organization-assigned), and an interface ID (unique to the host).

Subnetting in IPv6

With a /48 prefix, there are 16 bits available for creating /64 subnets within an organization without borrowing bits allocated for the interface ID.

IPv6 Address Types: Routability

Link-local addresses are used only for communication on the local subnet and are not routable.

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Description

This quiz covers essential concepts related to IPv6 addressing, including compression techniques, automatic address assignment, and link-local addresses. Test your knowledge of these important networking principles and how they apply to IPv6 addresses.