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Routing > Ipv6 Overview > Flashcards

Ipv6 Overview Flashcards

1
Q

What is the global routing prefix in IPv6?

A

The prefix assigned by the provider to a customer or site, varying by ISP policies.

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2
Q

What does the Subnet ID field in an IPv6 address indicate?

A

It identifies subnets within an organization.

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3
Q

What is the Interface ID in an IPv6 address?

A

Equivalent to the host portion of an IPv4 address, typically using a /64 subnet.

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4
Q

True or False: The all-0s IPv6 address can be assigned to any device.

A

False. The all-0s address is reserved as a Subnet-Router anycast address.

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5
Q

What are IPv6 global unicast addresses (GUAs)?

A

Globally unique addresses routable on the IPv6 internet.

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6
Q

Fill in the blank: IPv6 GUAs currently begin with the first three bits of ______.

A

001 or 2000::/3.

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7
Q

What is the range for IPv6 unique local addresses?

A

fc00::/7 to fdff::/7.

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8
Q

What is the primary use of unique local addresses (ULAs)?

A

For local addressing within a site or between limited sites.

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9
Q

What are the two types of unicast addresses typically assigned to IPv6 devices?

A
  • Global Unicast Address (GUA)
  • Link-local Address (LLA)
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10
Q

True or False: Link-local addresses (LLAs) can be routed.

A

False. LLAs are confined to a single link and cannot be routed.

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11
Q

What is the range of IPv6 link-local addresses (LLAs)?

A

fe80::/10.

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12
Q

What command is used to configure a static GUA on a router interface?

A

ipv6 address ipv6-address/prefix-length.

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13
Q

What is the recommended prefix length for IPv6 networks?

A

/64.

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14
Q

What are the three categories of IPv6 addresses?

A
  • Unicast
  • Multicast
  • Anycast
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15
Q

What does unicast mean in the context of IPv6?

A

It uniquely identifies an interface on an IPv6-enabled device.

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16
Q

What is the purpose of Router Solicitation (RS) messages?

A

To discover IPv6 routers.

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17
Q

What information can Router Advertisement (RA) messages provide?

A
  • Network prefix and prefix length
  • Default gateway address
  • DNS addresses and domain name
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18
Q

What does SLAAC stand for?

A

Stateless Address Autoconfiguration.

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19
Q

What is the maximum number of /64 subnets that can be created from a /48 global routing prefix?

A

65,536.

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20
Q

Fill in the blank: IPv6 addresses are represented in ______ format.

A

hexadecimal.

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21
Q

What is the preferred format for writing an IPv6 address?

A

x:x:x:x:x:x:x:x, with each ‘x’ consisting of four hexadecimal values.

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22
Q

What is the rule for omitting leading zeros in IPv6 addresses?

A

Leading 0s can be omitted, but trailing 0s must not be omitted.

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23
Q

What does a double colon (::) represent in IPv6 addresses?

A

It can replace a contiguous string of one or more 16-bit hextets consisting of all zeros.

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24
Q

What is the purpose of Dynamic Host Configuration Protocol for IPv6 (DHCPv6)?

A

To provide additional network information such as DNS server addresses.

25
Q

True or False: IPv4 and IPv6 will coexist for the foreseeable future.

A

True.

26
Q

What are the three migration techniques for transitioning from IPv4 to IPv6?

A
  • Dual stack
  • Tunneling
  • Translation
27
Q

What are the three categories of migration techniques to IPv6?

A

Dual stack, tunneling, translation

These techniques facilitate the transition from IPv4 to IPv6.

28
Q

What is the length of an IPv6 address?

A

128 bits

29
Q

What is the preferred format for writing an IPv6 address?

A

x:x:x:x:x:x:x:x

30
Q

How many hexadecimal values does each ‘x’ in an IPv6 address consist of?

A

Four

31
Q

What are the three types of IPv6 addresses?

A
  • Unicast
  • Multicast
  • Anycast
32
Q

What does an IPv6 unicast address do?

A

Uniquely identifies an interface on an IPv6-enabled device

33
Q

What is an IPv6 global unicast address (GUA)?

A

Globally unique and routable on the IPv6 internet

34
Q

What is the purpose of an IPv6 link-local address (LLA)?

A

Enables communication with other IPv6-enabled devices on the same link

35
Q

What command is used to configure an IPv6 GUA on an interface?

A

ipv6 address ipv6-address/prefix-length

36
Q

How does a device obtain a GUA dynamically?

A

Through ICMPv6 messages

37
Q

How often do IPv6 routers send out ICMPv6 RA messages?

A

Every 200 seconds

38
Q

What are the three methods of RA messages?

A
  • SLAAC
  • SLAAC with a stateless DHCPv6 server
  • Stateful DHCPv6 (no SLAAC)
39
Q

What processes can be used to create the interface ID in IPv6?

A
  • EUI-64 process
  • Randomly generated 64-bit number
40
Q

What is the EUI-64 process?

A

Uses the 48-bit Ethernet MAC address to create a 64-bit interface ID

41
Q

What happens if a device uses a randomly generated interface ID?

A

It may differ depending upon the operating system

42
Q

Is it mandatory for all IPv6 devices to have an IPv6 LLA?

A

Yes

43
Q

How can an LLA be created?

A

Manually or dynamically

44
Q

What are the two types of IPv6 multicast addresses?

A
  • Well-known multicast addresses
  • Solicited node multicast addresses
45
Q

What is the All-nodes multicast group address?

A

ff02::1

46
Q

What is the All-routers multicast group address?

A

ff02::2

47
Q

What is a solicited-node multicast address?

A

Similar to the all-nodes multicast address, mapped to a special Ethernet multicast address

48
Q

What is the purpose of the subnet ID field in an IPv6 GUA?

A

Used to create subnets

49
Q

What is stateful DHCPv6?

A

A method for a device to automatically receive a GUA, prefix length, and DNS server addresses

50
Q

What does the RA message suggest for devices?

A
  • Use router LLA for default gateway
  • Use stateful DHCPv6 server for GUA and DNS server address
51
Q

What is the value inserted in the EUI-64 process?

A

A 16 bit value of fffe

52
Q

What happens to the 7th bit of the client MAC address in the EUI-64 process?

A

It is reversed from binary 0 to 1

53
Q

What is Duplicate Address Detection (DAD)?

A

A process to ensure the uniqueness of any IPv6 unicast address

54
Q

How are dynamic LLAs created?

A

Using the fe80::/10 prefix and the interface ID

55
Q

What is the default method Cisco IOS routers use to generate the interface ID for LLAs?

A

EUI-64

56
Q

What is the IPv6 address format for a dynamically configured LLA on Cisco routers?

A

fe80:: followed by the EUI-64 generated interface ID

57
Q

What is the command to check the IPv6 interface configuration on Cisco routers?

A

show ipv6 interface brief

58
Q

What are link local address (LLA)

A

Required for every IPv6-enabled device and used to communicate with other devices on the same local link. LLAs are not routable and are confined to a single link.

Routing (19 decks)

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