Volume 1 - Chapter 27: Implementing IPv6 Addressing on Routers Flashcards
What is the correct command to statically configure an IPv6 address of FD90:0100:1234::5 /64 on a router interface?
ipv6 address FC90:0100:1234::0005/64
Note that there is no space between the interface ID and the prefix at the end, routers will not allow you to add a space.
What is the command to enable the use of IPv6 routing?
ipv6 unicast-routing
True or false, a router will accept IPv6 commands, but not process them if IPv6 routing is not enabled?
True. You can still configure IPv6 without it enabled, but the router will not route any IPv6 packets
What are the commands to show information about IPv6 enabled interfaces?
show ipv6 interface brief
show ipv6 interface
What is the command to print the IPv6 routing table?
show ipv6 route
What method of addressing is used to automatically calculate an IPv6 for an interface based on the MAC address?
Modified EUI-64 (Extended Unique Identifier)
Describe the process of EUI-64 calculating an address.
Step 1: The MAC is split into 2 halves of 6 bytes each
Step 2: The hex FFFE is put into the middle
Step 3: The 7th bit of the address is inverted
What is the command to set an IPv6 address using EUI-64?
ipv6 address prefix/prefixlength eui-64
A technician runs the command show ip interface brief and gets the address attribute of EUI.
What is indicated by this?
That the interface is using an IP address generated by EUI-64.
A technician runs the command show ip interface brief and gets the address attribute of TEN.
What is indicated by this?
The IP address is Tentative; currently performing Duplicate Address Detection (DAD).
A technician runs the command show ip interface brief and gets the address attribute of CAL.
What is indicated by this?
The IP address is Calendared; the address has a fixed lifetime.
A technician runs the command show ip interface brief and gets the address attribute of PRE.
What is indicated by this?
The IP address is Preferred; the address is preferred during its calendar (CAL) lifetime.
When is it likely to see IPv6 attributes of CAL or PRE on an interface?
When the address associated with the interface is using SLAAC or DHCP
What is the command to assign an IPv6 address on an interface using DHCP?
ipv6 address dhcp
What is the command to assign an IPv6 address on an interface using SLAAC?
ipv6 address autoconfig
What is the purpose of IPv6 Link-Local Addresses?
To send and receive data on a point-to-point link before a GUA or ULA has been assigned
All interfaces that support IPv6 must have a ___ configured.
A Link-Local Address
How do routers generate IPv6 link-local addresses?
Using EUI-64
What is the prefix associated with an IPv6 link-local address?
FE80::/10
What is the command to statically assign a link-local address to an interface?
ipv6 address address link-local
Describe the difference between a router using SLAAC to generate an IPv6 address, versus an address being statically configured as EUI-64
In both scenarios, EUI is used. However, with SLAAC the interface dynamically learns the prefix and prefix length.
Whereas you are statically configuring the prefix and dynamically generating only the IID otherwise.
What is the command used to generate an IPv6 link-local address on an interface, but to purposefully leave it without a GUA or ULA address?
ipv6 enable
What type of IPv6 multicast scope describes a packet that stays within the same host?
Interface-Local
What type of IPv6 multicast scope describes a packet that stays within the same physical link and cannot be routed?
Link-Local
What type of IPv6 multicast scope describes a packet that cannot be forwarded to the WAN?
Site-Local
What type of IPv6 multicast scope describes a packet that stays within the organization?
Organization-Local
What type of IPv6 multicast scope describes a packet that has no boundries/restrictions?
Global
What is the prefix and prefix length for a Solicited-Node Multicast Address?
FF02::1:FF/104
How does a router dynamically generate a Solicited-Node Multicast Address?
By appending the last 6 hex-digits of the currently configured ULA or GUA IP to the address FF02::1:FF/104
A router generates a solicited-node multicast address for ___ address on an interface.
ULA, GUA, and Link-Local
What IPv6 address is designated as “unspecified”?
::
What is a restriction of the unspecified IPv6 address?
It can only be used as a source address
What IPv6 address is designated as the loopback address?
::1
What type of IPv6 address is identically configured across multiple routers and used when devices want to send data to a group of routers that all share a service?
Anycast
What is the command to configure an IPv6 anycast address on an interface?
ipv6 address address/prefix anycast
