Questions and Answers
The term __________ refers to the fact that each address is used by only one interface.
Unicast
What IPv4 Classes define unicast IPv4 Address?
Class A, B, C, D, E
IPv6 does not use any concept like the classful network concept used by IPv4.
True
Global Unicast addresses serve as (Public / Private) IPv6 addresses.
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IPv6 global _______ addresses rely on an administrative process that assigns each company a unique IPv6 address block.
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Global Unicast Addresses are similar to IPv4 Public / Private Address.
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Each company then ________ this IPv6 address block and only uses addresses from within that block.
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In IPv6 Global Unicast, each organization asks for a block of IPv6 addresses, which no one else can use.
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That Global Unicast reserved block of IPv6 addresses is called a global routing _______.
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Very generally, you can think of the global routing ________ like an IPv4 Class A, B, or C network number.
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What is the organization that oversees global IP address allocation?
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___________ is an organization that manages the allocation and registration of Internet number resources within a region of the world.
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Match the steps in the organizational order of IPv6 address assignment:
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Unless otherwise assigned by IANA, what are the two currently used Global Unicast IPv6 Ranges issued to RIRs?
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An ISP will typically issue to an organization an IPv6 address block with a prefix length of /
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As IPv6 is easier to subnet, most organizations will take their assigned range and will subnet it using IPv6 prefix / ____.
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Typically, if a home user is using IPv4, your ISP will issue you an IPv6/prefix of /____.
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The IPv6 standards state that address assigned to individual hosts should use a /64 prefix.
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When using VLANs, IPv6 uses the same rules where you have 1 subnet for each VLAN and 1 subnet for each Point-to-Point WAN connection.
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In IPv4, the prefix for a Point-to-Point link would be /30. For IPv6, what is the prefix as defined in the IPv6 standard?
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Similar to Classful IPv4 Subnetting, IPv6 breaks up the IP range into 3 parts:
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Unlike IPv4, IPv6 has no concept of address classes, so no preset rules determine the prefix length of the global routing prefix.
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When a company applies to an ISP, RIR, or any other organization that can assign a global routing prefix, that assignment includes both the 1 and 2.
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A 64-bit interface ID field does not work well in real networks, and should be avoided for the interface ID field.
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To find the Subnet, you use the length of the global routing prefix, the subnet field is typically __________ bits, with P being the length of the global routing prefix.
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If an organization sticks to the /64 prefix for all subnets, they would have 2 to the 1 possible subnets.
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Like with IPv4, IPv6 needs to identify each IPv6 subnet with some kind of a subnet identifier, or subnet ID.
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For an IPv6 address with a Global Routing prefix of 2001:0DB8:1111/24 and a subnet ID of 1, your complete IPv6 Subnet ID would be _____
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If you had an IPv6 address w/ a Global Routing prefix of 2001:0DB8:1111/24 and a subnet ID of 1, what would the next Subnet ID be_____
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For each subnet ID, the first IPv6 address of the subnet is called _________.
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What are the two Dynamic ways to assign Unicast IPv6 addresses?
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You would typically use Stateful DHCP / SLAAC to dynamically configure an IPv6 address for a router's interface for connections such as 1 or a 2.
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What command would you use to allow a router's interface to use Stateful DHCP?
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What command would you use to allow a router's interface to use Stateless Address Autoconfiguration?
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What are the 2 options Cisco provides to configure stable static IPv6 Addresses?
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Of the 2 options Cisco provides to configure stable static IPv6 Addresses, which option uses the host's MAC address to determine the Interface ID?
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If you are going to use IPv6 Address on Cisco Routers, you MUST enable this feature and it will NOT work automatically once you assign IPv6 Addresses.
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Before you can assign IPv6 Address to an interface, you need to turn on IPv6 Routing. To do this, you enter the following command.
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Once you enable IPv6 on a router, setting a unicast IPv6 address on an interface causes the router to give the interface a ___________ IPv6 Address.
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Once you enable IPv6 on a router, setting a unicast IPv6 address on an interface causes the router to enable the ________ of IPv6 packets in/out that interface.
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Once you enable IPv6 on a router, setting a unicast IPv6 address on an interface causes the router to define the IPv6 prefix (_______) that exists off that interface.
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Once you enable IPv6 on a router, setting a unicast IPv6 address on an interface causes the router to tell the router to add a _________ IPv6 route for that prefix, to the IPv6 routing table.
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To statically configure the full 128-bit unicast address, the router needs an ____________ interface subcommand on each interface.
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When assigning IPv6 address and prefix lengths to Cisco interfaces, you can use the abbreviated versions of the addresses.
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When assigning an IPv6 address and prefix to a Cisco interface, in regards to the prefix, you can use the subnet mask or prefix (ex./64).
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This show command gives you interface IPv6 address info, but not prefix length info.
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This show command gives you the details of IPv6 interface settings, much like the show ip interface command does for IPv4.
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If you use the 'show interfaces' command on a router configured with IPv6 addresses, IPv6 Addresses (will / will not) be displayed.
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Once you assign IPv6 Unicast Addresses to an interface, the router also adds IPv6 _____________ routes to the IPv6 routing table.
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What command can you use to see the listed connected IPv6 routes that are connected to an interface?
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Study Notes
IPv6 Address Types
- Unicast addresses are assigned to a single interface, ensuring unique identification.
- IPv4 defines unicast addresses across Classes A, B, C, D, and E.
- IPv6 abandons the classful network concept present in IPv4; each address is uniquely allocated without classes.
- Global Unicast addresses in IPv6 are considered public and are globally routable.
- The assignment of IPv6 global unicast addresses begins with IANA allocating large blocks to RIRs, which further divide these into subnets for ISPs to issue accordingly.
- Unique IPv6 address blocks are essential for each organization, preventing overlap across different entities.
Address Allocation Process
- IANA is responsible for issuing large address blocks to RIRs.
- RIRs manage the distribution and registration of Internet number resources.
- ISPs allocate smaller subnets from the blocks they receive from RIRs.
- Global Unicast IPv6 ranges typically start with 2000::/16 or 3000::/16.
Address Prefix and Subnetting
- Organizations are typically assigned a /48 prefix from which they can create their subnets with a /64 prefix length, allowing significant flexibility in network design.
- For each subnet, a total of 65,536 subnets can be derived using a consistent /64 prefix strategy.
- Subnetting in IPv6 consists of three parts: Global Routing Prefix, Subnet, and Interface ID, similar to IPv4 subnetting principles.
Interface Configuration and Routing
- For dynamic IPv6 address assignment, methods include Stateful DHCP and Stateless Address Autoconfiguration (SLAAC).
- Critical commands for configuring IPv6 on routers include enabling IPv6 routing with
ipv6 unicast-routing, setting an address withipv6 address, and selecting dynamic address assignment methods. - To validate configured addresses and prefixes, use
show ipv6 interface brieforshow ipv6 interfacefor detailed settings.
Important Considerations
- Each IPv6 subnet must have a Subnet Router Anycast Address, which is reserved and should not be assigned to hosts.
- Unique methods to ensure static IPv6 addresses include using either full 128-bit addresses or deriving 64-bit prefixes via the Modified EUI-64 method.
- Show commands allow for effective monitoring of IPv6 configurations and connected routes, critical for network management.
- IPv6 addresses utilize interface IDs generally structured to leverage the MAC address, ensuring uniqueness in a typical networking environment.
Summary of Addresses and Specifications
- The first usable IP in each subnet serves as the address for the subnet router and should not be assigned to other devices.
- IPv6 facilitates easier subnet management and provides a large address space, essential for modern network demands.
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Description
This quiz covers the various types of IPv6 addresses, particularly focusing on Unicast addresses. It explains the differences between IPv4 and IPv6 address allocation, the role of IANA, and the Global Unicast address process. Test your knowledge on how these address types are uniquely identified and allocated across networks.
