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Cisco Certs > IPv6 > Flashcards

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
FE80
FE90
FEA0
FEB0
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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

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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10
Q

What does SLAAC stand for?

A

StateLess Address AutoConfiguration

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11
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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12
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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13
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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14
Q

What address is an RS message sent to?

A

All-routers

FF02::2

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15
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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16
Q

What is the all-host IPv6 address?

A

FF02::1

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17
Q

What 5 IPv6 functions use NDP?

A 
SLAAC
DAD
Router Discovery
Neighbor MAC Discovery
Prefix/length Discovery
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18
Q

What is the all-DHCP-agents multicast address?

A

FF02::1:2

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19
Q

What is the all-router IPv6 address?

A

FF02::2

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20
Q

Where would a host using SLAAC get the DNS server address?

A

From stateless DHCPv6

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21
Q

4 major types of IPv6 addresses

A

Global Unicast
Unique local
Multicast
Link-local

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22
Q

How does DAD work?

A

Host sends a NS message for it’s IPv6 address. If someone answers, must be a duplicate.

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23
Q

Who primarily sends an RS message?

A

Hosts

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24
Q

When are RA messages sent?

A

In response to a RS message
Or
Unsolicited, on a timer

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25
Q

What does NDP replace?

A

IPv4 ARP

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26
Q

If you really want to configure the link-local address, what is the syntax?

A

ipv6 address local IPv6 addr link-local

27
Q

Command to statically configure an IPv6 address on an interface

A

conf t
interface int
ipv6 address address/mask

28
Q

Command to have an interface use an EUI-64 address

A

ipv6 address prefix/64 eui-64

29
Q

Command to have a router use SLAAC to dynamically get an IPv6 address

A

ipv6 address autoconfig

30
Q

Command to have a router use DHCPv6 on an interface

A

ipv6 address dhcp

31
Q

Command to enable a router to forward IPv6 packets

A

ipv6 unicast-routing

32
Q

What is the scope of the solicited-node multicast address?

A

Link-local

33
Q

In IPv6, what replaces ARP?

A

Neighbor discovery

34
Q

What does NDP stand for?

A

Neighbor Discovery Protocol

35
Q

What types of messages are used to find a neighbor’s MAC address in IPv6?Using what protocol?

A

NS and NA

NDP

36
Q

What are global unicast IPv6 addresses the equivalent of?

A

Public IPv4 addresses

37
Q

What are the versions of the IGPs that support IPv6?

A

RIPng
OSPFv3
EIGRPv6

38
Q

What are unique local IPv6 addresses the equivalent of?

A

Roughly, RFC1918 addresses

39
Q

What do RS and RA stand for?

A

Router Solicitation

Router Advertisement

40
Q

Who primarily sends RA messages?

A

Routers

41
Q

2 commands to see IPv6 interface information

A

show ipv6 interface brief

show ipv6 interace interface

42
Q

DHCPv4 uses Discover/Offer/Request/Acknowledgement messages. What does DHCPv6 use?

A

Solicit - Host
Advertise - Server
Request - Host
Reply - Server

43
Q

When a host uses SLAAC, what crucial data is it missing?

A

the DNS server’s address

44
Q

When a router receives a link-local packet, what are the steps it takes to forward it out another interface?

A

Link local packets are not forwarded out other interfaces; they are scoped to a single link.

45
Q

4 steps to creating an EUI-64 address

A
  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.
46
Q

What are the 2 rules for shortening IPv6 addresses?

A
  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 ::

47
Q

If an organization is allocated a /54, how many bits are available for subnets?

A

10

48
Q

How many bits in an IPv6 address?How many bytes?

A

128 bits

16 bytes

49
Q

What’s the size of the required section of the IPv6 header?

A

40 bytes

50
Q

How many : delimited sections are there in an IPv6 address?

A

82340:1111:AAAA:0001:1234:5678:9ABC:1234

51
Q

What is the 7th bit in the EUI-64 interface ID?

A

The universal/local bit.

52
Q

Syntax to configure an IPv6 address on interface s0/0/0

A

conf t
int s0/0/0
ipv6 address ipv6 addr/mask

53
Q

Command to set an IPv6 static default route going out gi1/0

A

conf t

ipv6 route ::/0 gi1/0

54
Q

Command to set an IPv6 static route

A

conf t

ipv6 route network/mask {next hop IPv6 | exit interface}

55
Q

Command to enable ipv6 globally

A

conf t

ipv6 unicast-routing

56
Q

What does DAD stand for?

A

Duplicate Address Detection

57
Q

When is a link local IPv6 address instantiated on a router’s interface?

A

When another IPv6 address is configured or aqcuired on the same interface.

58
Q

How are link-local addresses configured in the router?

A

They are automatically and self-generated.

59
Q

What is the range of globally routable IPv6 addresses, in / notation.

A

2000::/3

60
Q

What do the 2 options for the U/L bit signify?

A

0 = BIA MAC is being used1 = Locally administered address, ie BIA has been overwritten

61
Q

What is one difference between DHCPv4 and v6 in terms of types of information supplied to the requesting host by the DHCP server.

A

DHCPv6 does not supply default router info. That is discovered by the host, using RS messages.

62
Q

Name 2 ways for a router to get an IPv6 address dynamically

A
  1. Stateful DHCP

2. SLAAC

63
Q

What’s the most common IPv6 subnet mask for hosts or interfaces?

A

/64

64
Q

What is the ethertype for IPv6

A

0x86DD

Cisco Certs (14 decks)

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