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ICND1 Section 7 - IPv6 Flashcards

1
Q

What does EUI stand for?

A

Extended Unique Identifier

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2
Q

What is the / range for IPv6 unique local address space?

A

FC00::/7

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3
Q

What do IPv6 link-local addresses start with?

A

FE80

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4
Q

What is the prefix range for link-local addresses?

A 
FE80::/10
FE8
FE9
FEA
FEB
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5
Q

What method is used to create the link-local address for an interface?

A

FE80::/64 + EUI-64 interface ID

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6
Q

What do IPv6 multicast addressess start with?

A

FF

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7
Q

What is the IPv6 multicast range?

A

FF00::/8

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8
Q

What IPv6 multicast range is reserved for link local only?

A

FF02::/16

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9
Q

What organization hands out IP’s globally?

A

IANA

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10
Q

When a host wants to use DHCPv6 to get an IP, what source/destination addresses does it use?

A 
Source = it's link-local address
Destination = FF02::1:2
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11
Q

What does SLAAC stand for?

A

StateLess Address AutoConfiguration

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12
Q

Command to set an IPv6 dhcp relay on an interface

A

conf t
int gi0/0
ipv6 dhcp relay destination -DHCP server addr-

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13
Q

Command to configure a router-id for an OSPFv3 router

A

conf t
ipv6 router ospf
router-id <ipv4></ipv4>

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14
Q

What is the all-EIGRP routers IPv6 address?

A

FF02::10

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15
Q

What are 2 uses for link-local addresses?

A

Communication with directly connected neighbors

Routers use their neighbors link-local addresses as next hops in routing tables

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16
Q

Syntax to enable OSPFv3 on a router

A

conf t

ipv6 router ospf <PID></PID>

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17
Q

3 steps for a host to get an IPv6 address using SLAAC

A
  1. Discover the v6 prefix on the link using NDP RS/RA messages.
  2. Create an interface ID and append it to the prefix.
  3. Test that it’s not a duplicate using DAD.
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18
Q

What address is an RS message sent to?

A

All-routers

FF02::2

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19
Q

Command to passive an OSPFv3 interface

A

conf t
ipv6 router ospf
passive-interface <interface></interface>

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20
Q

When using SLAAC, how does a host come up with it’s interface ID?

A

Either using EUI-64 or coming up with a random value.

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21
Q

What is the all-host IPv6 address?

A

FF02::1

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22
Q

What 5 IPv6 functions use NDP?

A 
SLAAC
DAD
Router Discovery
Neighbor MAC Discovery
Prefix/length Discovery
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23
Q

What is the all-DHCP-agents multicast address?

A

FF02::1:2

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24
Q

What is the all-router IPv6 address?

A

FF02::2

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25
What is the all-OSPF IPv6 address?
FF02::5
26
What is the all-DR IPv6 address?
FF02::6
27
Where would a host using SLAAC get the DNS server address?
From stateless DHCPv6
28
4 major types of IPv6 addresses
Global Unicast Unique local Multicast Link-local
29
How does DAD work?
Host sends a NS message for it's IPv6 address. If someone answers, must be a duplicate.
30
Who primarily sends an RS message?
Hosts
31
When are RA messages sent?
In response to a RS message Or Unsolicited, on a timer
32
What does NDP replace?
IPv4 ARP
33
If you really want to configure the link-local address, what is the syntax?
ipv6 address link-local
34
Command to statically configure an IPv6 address on an interface
ipv6 address
``` interface GigabitEthernet0/0 ipv6 address 2001:DB8:1111:1::1/64 ! interface Serial0/0/0 ipv6 address 2001:0db8:1111:0002:0000:0000:0000:0001/64 ```
35
Command to have an interface use an EUI-64 address
ipv6 address *prefix*/64 eui-64
36
Command to have a router use SLAAC to dynamically get an IPv6 address
ipv6 address autoconfig
37
Command to have a router use DHCPv6 on an interface
ipv6 address dhcp
38
Command to enable a router to forward IPv6 packets
ipv6 unicast-routing
39
What is the scope of the solicited-node multicast address?
Link-local
40
In IPv6, what replaces ARP?
Neighbor discovery
41
What does NDP stand for?
Neighbor Discovery Protocol
42
What types of messages are used to find a neighbor's MAC address in IPv6? Using what protocol?
NS and NA | NDP
43
What are global unicast IPv6 addresses the equivalent of?
Public IPv4 addresses
44
What are the versions of the IGPs that support IPv6?
RIPng OSPFv3 EIGRPv6
45
What are unique local IPv6 addresses the equivalent of?
Roughly, RFC1918 addresses
46
What do RS and RA stand for?
Router Solicitation | Router Advertisement
47
Who primarily sends RA messages?
Routers
48
The difference between commands used to verify OSPFv2 versus OSPFv3
show ip * vs show ipv6 *
49
2 commands to see IPv6 interface information
show ipv6 interface brief | show ipv6 interace []
50
DHCPv4 uses Discover/Offer/Request/Acknowledgement messages. What does DHCPv6 use?
Solicit - Host Advertise - Server Request - Host Reply - Server
51
When a host uses SLAAC, what crucial data is it missing?
the DNS server's address
52
When a router receives a link-local packet, what are the steps it takes to forward it out another interface?
Link local packets are not forwarded out other interfaces; they are scoped to a single link.
53
What version of OSPF supports IPv6?
version 3
54
4 steps to creating an EUI-64 address
1. Take the MAC address of the interface, and split it in half. 2. Insert FF:FE into the middle of the MAC. 3. Invert the 7th bit of the the result from step 2. 4. Append this to the IPv6 prefix.
55
What are the 2 rules for shortening IPv6 addresses?
1. In each quartet, remove any leading 0's. | 2. For any single sequence of quartet's whos value is 0, collapse that sequence into ::
56
If an organization is allocated a /54, how many bits are available for subnets?
10
57
How many bits in an IPv6 address? | How many bytes?
128 bits | 16 bytes
58
What's the size of the required section of the IPv6 header?
40 bytes
59
How many : delimited sections are there in an IPv6 address?
8 | 2340:1111:AAAA:0001:1234:5678:9ABC:1234
60
Who hands out IP's for North America?
ARIN
61
In OSPFv3, how does one include an interface in routing?
by enabling routing directly on the interface, not via the network command
62
Generic syntax to add an interface into OSPFv3
conf t int ipv6 ospf *PID* area *Area ID*
63
What is the 7th bit in the EUI-64 interface ID?
The universal/local bit.
64
Syntax to enable OSPFv3 on int gi1/0, in area 0 ipv6 router ospf 12 router-id 1.2.3.4
conf t int gi1/0 ipv6 ospf 12 area 0
65
Syntax to configure an IPv6 address on interface s0/0/0
conf t int s0/0/0 ipv6 address /
66
Command to set an IPv6 static default route going out gi1/0
conf t | ipv6 route ::/0 gi1/0
67
Command to set an IPv6 static route
conf t | ipv6 route
68
Command to enable ipv6 globally
conf t | ipv6 unicast-routing
69
What does DAD stand for?
Duplicate Address Detection
70
When is a link local IPv6 address instantiated on a router's interface?
When another IPv6 address is configured or aqcuired on the same interface.
71
How are link-local addresses configured in the router?
They are automatically and self-generated.
72
What is the range of globally routable IPv6 addresses, in / notation.
2000::/3
73
What do the 2 options for the U/L bit signify?
``` 0 = BIA MAC is being used 1 = Locally administered address, ie BIA has been overwritten ```
74
What is one difference between DHCPv4 and v6 in terms of types of information supplied to the requesting host by the DHCP server.
1. DHCPv6 does not supply default router info. That is discovered by the host, using RS messages.
75
Name 2 ways for a router to get an IPv6 address dynamically
1. Stateful DHCP | 2. SLAAC
76
What's the most common IPv6 subnet mask for hosts or interfaces?
/64

CCNA (11 decks)

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