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Questions and Answers
Which command is used to activate an IPv6 interface?
Which command is used to activate an IPv6 interface?
- no shutdown (correct)
- interface activation
- ipv6 address ipv6-address/prefix-length
- ipv6 enable
What is the significance of the first 64 bits in an IPv6 address?
What is the significance of the first 64 bits in an IPv6 address?
- They are used for routing as the network component. (correct)
- They are used to globally identify devices.
- They contain the subnet mask information.
- They represent the link-local address.
Which command creates a static link-local IPv6 address?
Which command creates a static link-local IPv6 address?
- ipv6 address ipv6-address/prefix-length link-local (correct)
- ipv6 address ipv6-address/prefix-length eui-64
- create link-local ipv6-address
- ipv6 address ipv6-address/prefix-length global
How can an interface generate its own IPv6 link-local address?
How can an interface generate its own IPv6 link-local address?
What is the purpose of the lower 16 bits of the network component in an IPv6 address?
What is the purpose of the lower 16 bits of the network component in an IPv6 address?
Which of the following statements is true about IPv6 interfaces?
Which of the following statements is true about IPv6 interfaces?
What do the commands 'ipv6 address ipv6-address/prefix-length' and 'ipv6 address ipv6-address/prefix-length eui-64' have in common?
What do the commands 'ipv6 address ipv6-address/prefix-length' and 'ipv6 address ipv6-address/prefix-length eui-64' have in common?
In IPv6 address structure, what is primarily indicated by the upper 48-bit section?
In IPv6 address structure, what is primarily indicated by the upper 48-bit section?
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Study Notes
IPv6 Router Interface Configuration
- IPv6 commands in Cisco IOS closely mirror those for IPv4, replacing "ip" with "ipv6."
- Key steps for configuring an IPv6 router interface include:
- Assigning an IPv6 address and subnet mask using the command
ipv6 address ipv6-address/prefix-length [link-local | eui-64]. - Activating the interface with the
no shutdowncommand.
- Assigning an IPv6 address and subnet mask using the command
- An interface can autonomously generate its IPv6 link-local address through the command
ipv6 enable. - IPv6 interfaces can host multiple addresses, typically including at least one IPv6 link-local address and one global unicast address.
- Each IPv6 interface may hold multiple global unicast addresses from the same subnet.
Creating IPv6 Addresses
- To statically define IPv6 addresses, use the following commands:
ipv6 address ipv6-address/prefix-lengthfor global unicast addresses.ipv6 address ipv6-address/prefix-length eui-64to create a global unicast address with an EUI-64 identifier.ipv6 address ipv6-address/prefix-length link-localto specify a static link-local address, overriding the automatically assigned one after enabling the global unicast address.
IPv6 Address Structure
- IPv6 addresses consist of two main components: the network part and the node part.
- The network component comprises the initial 64 bits, which are essential for routing purposes.
- The node component occupies the remaining 64 bits, identifying the specific interface.
- The network component can further divide into:
- A 48-bit global identifier responsible for global addressing.
- A 16-bit section managed by administrators for subnetting within an internal network.
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