IPv6 Flashcards
How many bits is an IPv6 address?
128 Bits
How many 16 bit hexadecimal fields are there in an IPv6 address?
8
How could you rewrite this IPv6 Address?
2001:0DB8:0000:0001:0000:0000:0000:0001
2001:db8:0:1:0:0:0:1
OR
2001:db8:0:1::1
What does a double colon (::) in an IPv6 address represent?
It means there were successive 0 hextet fields in the IPv6 Address
How many double colons can you have in an IPv6 address?
1
Rewrite 2001:0db8:0001:0002:0000:0000:FFE8:0001 to shorthand
2001:db8:1:2::ffe8:1
What is a common block assigned for a company in regards to an IPv6 address space?
/48
What mask should IPv6 hosts have per IPv6 official standards?
/64
What hextet is the subnet decided on?
the 4th from the left
Example: 2001:db8:1:2::ffe8:1
What do the first 3 hextets represent in an IPv6 address?
The Company Portion of the IPv6 Address
What do the last 4 hextets represent in an IPv6 address?
The Host Portion of the Address
How many subnets would a normal /64 network be able to use?
65,535
Does IPv6 support Broadcast traffic?
No
What does IPv6 do to get around not supporting Broadcast traffic?
It supports multicast traffic to ALL hosts on the local subnet which is functionally equivalent
How would you configure a manual IPv6 address?
ipv6 unicast-routing
int {int}
ipv6 add {add}
How would you verify an IPv6 address?
show ipv6 int brief
The first 3 hectets also reflect what about the IPv6 address other than the company portion?
It’s the portion of the address that was assigned by the ISP or internet authorities
What is the subnet hextet in this IPv6 address?
2001:db8:FF01:0001::1
0001
How does an EUI-64 Address get it’s address?
The router is given the company portion of the address by an admin
The router then derives the IPv6 address host portion from the MAC Address
FF:FE is injected in the middle of the host portion to bring it up to 64 bits
7th bit of the host portion is inverted
Scenario:
IPv6 Network Portion: 2001:db8:0:1/64
MAC Address: ca01.2f24.0000
What would be EUI-64 Address?
2001:db8:0:1:c801:2fff:fe24:0
Pick out the unique bits in this EUI-64 Address
2001:db8:01:c801:2fff:fe24:0
8
FF
FE
Are Unique Local Addresses publicly reachable?
No
What range are Unique Local Addresses assigned from?
FC00::/7
Link Local Addresses are valid for communications on _________________?
That specific link only
What range are Link Local Addresses assigned from?
FE80::/10 - FEB0::/10
What type of communications would Link Local Addresses be used for?
Routing Protocol Hello Packets and Updates
What type of IPv6 Address is this?
FE80::C801:2FFF:FE24:0
Link Local
What type of IPv6 Address is this?
2001:db8:01:c801:2fff:fe24:0
EUI-64
What type of IPv6 Address is this?
2001:DB8:0:1::1
Global Unicast Address
How would you manually configure an IPv6 Link Local Address?
- R1(config)#int fa0/0
- R1(config-if)#ipv6 address fe80::1 link-local
Convert this IPv6 Shorthand Address to Full Long Hand
fe80::1
fe80:0000:0000:0000:0000:0000:0000:0001
Is it possible to have two Link Local Addresses be the same in the same IPv6 subnet?
Yes
How does traffic differentiate where to send traffic if there are multiple identical IPv6 Link Local Addresses
The port it’s going out of will be the differentiator here
If you want to have two IPv4 addresses on an interface what command must you specify after you add the second IP Address?
secondary
What protocol is considered Stateful in terms of handing out IP Addresses?
DHCP
What protocol is considered Stateless in terms of handing out IP Addresses?
SLAAC
What does SLAAC stand for?
Stateless Address Auto Configuration
What is sent out by default when a global unicast address is configured on a router interface?
Router advertisements that advertise the network prefix
What protocol is used when the router advertisements are sent out advertising the network prefix?
ICMP messages
True or False: Hosts can get their IPv6 addresses without having to use DHCP using SLAAC
True
True or False: The router tells the host which subnet to generate its IPv6 Address on?
True
True or False: The router does not tell the host which default gateway to use
False. The router will tell the host to use itself as the default gateway
True or False: The PC can learn it’s DNS server through SLAAC?
False. It still has to use a DHCP Server for this
Until a host has an IPv6 address what address will it have when sending out traffic?
::
What does** ::** stand for when it comes to SLAAC and IPv6 addressing?
:: is the unspecified or unknown address
What the default route for any any with IPv6 Addressing?
::/0
What does ::/0 compare to with IPv4 routing and addressing?
0.0.0.0 0.0.0.0
True or False: :: is used as the source address when a host is trying to acquire an address
True
What is IPv6’s version of ARP?
Neighbor Discovery
What does Neighbor Discovery use rather than ARP Replies and Requests?
ICMP neighbor solicitations and neighbor advertisements
What command would verify IPv6 neighbors?
show ipv6 neighbors
True or False: You can’t have an IPv4 address along with IPv6 address on one interface on a router.
False. You can if it’s a dual stack router.
What command do you need to be sure and put in to enable routing for IPv6?
ipv6 unicast-routing
What version of OPSF supports IPv6?
OSPFv3
What version of RIP supports IPv6?
RIPng (next generation)
What version of EIGRP supports IPv6?
EIGRP for IPv6
Which IPv6 address is the all-router multicast group?
FF02::2
