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34 Cards in this Set
- Front
- Back
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What are 3 methods to go for IPv4 to IPv6? |
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What is dual stack? |
Dual stack means that your device is running IPv4 and IPv6 simultaneously so you can serve IPv4 and IPv6 devices.
NOTE: It sounds interesting but it's nothing more than having an IPv4 and IPv6 address configured on your interface. |
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What is tunneling? |
This is where we will put IPv6 packets in IPv4 packets (encapsulation) or the other way around
NOTE: The internet is mostly IPv4 so this is one method to connect two IPv6-only LANs with each other over IPv4 network like the internet |
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What forms of NAT are used to translate between IPv4 and IPv6? |
NAT-PT
NAT64 |
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Which version of NAT is supported on higher end routers to translate between IPv4 and IPv6?
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NAT64
NOTE: NAT-PT is supported on IOS routers but has been deprecated as per RFC 4966. |
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What are the 2 methods of static point-to-point IPv6 tunnels? |
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How do manual tunnels and GRE tunnels support IPv6? |
Both support IPv6 IGPs through the tunnel interface and forwarding multicast traffic. |
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What is GRE?
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Generic Routing Encapsulation
This is a generic encapsulation type that rides on top of IPv4 and isn't only for IPv6 NOTE: If you ever configured IPSEC VPN with IGPs running through it you had to use GRE |
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Why would you use a loopback to configure a tunnel instead of a physical interface? |
The physical interface could go down. |
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By default a tunnel is always a ___________ |
GRE
Generic Routing Encapsulation |
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How do you change a GRE into a manual tunnel? |
"tunnel mode IPv6" command |
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What command can you use to verify your tunnel is working? |
show interfaces tunnel |
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What commands can you use to switch a manual tunnel back to a GRE? |
"tunnel mode gre ip"
or
"no tunnel mode ipv6ip"
commands |
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What is the main difference between a GRE and a manual tunnel? |
GRE has a higher MTU by default |
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The link-local address for the GRE tunnel is created with ________________ |
EUI-64 |
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The link-local address for the GRE tunnel takes the ______________ numbered interface's MAC address. |
Lowest |
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The link-local address for the manual tunnel is ______________ |
FE80::/96+32 bits from tunnel source |
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Dynamic Multicast IPv6 Tunnels |
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What is the downside to dynamic multipoint IPv6 tunnels? |
They don't support IGPs |
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What are the two types of Dynamic multipoint IPv6? |
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How does "automatic 6to4" work? |
The IPv4 end-point address will be wrapped in the IPv6 destination address.
NOTE: IPv4 is only 32 bits so its easy to fit into 128 bits |
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What is this address range saved for 2002::/16? |
tunneling |
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How does the address space reserved for tunneling work? |
2002::/16
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What does the "IPv6 general prefix" command. |
It converts the IPv4 address space into hexadecimal and give you the correct tunnel prefix. |
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What does the command "tunnel mode ipv6ip 6to4 do"? |
Tells the router to get IPv4 from the IPv6 address |
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What does ISATAP stand for? |
Intra-site Automatic Tunneling Address Protocol |
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What address range does ISATAP use? |
Normal Global Unicast Range
NOTE: This does not use 2002::/16 |
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Where does ISATAP embeds the IPv4 address ________________? |
in the last two quartets |
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How do all the tunnel interfaces connect in ISATAP? |
They use a single prefix to which all the tunnel interfaces connect. |
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How does ISATAP tunnel automatically create the tunnel interface ID |
It uses EUI-64 |
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Why does EUI-64 work different? |
It has no mac address |
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What are the EUI-64 rules? |
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In order to enable enable router advertisements on a tunnel interface what command must you use? |
no ipv6 nd suppress-ra |
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What command sets the tunnel to ISATAP? |
tunnel mode ipv6ip isatap |
