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Routing > Module 8 > Flashcards

Module 8 Flashcards

1
Q

What does SLAAC stand for?

A

Stateless Address Autoconfiguration

SLAAC is a method used by IPv6 devices to automatically configure their own IP addresses.

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2
Q

What is a Global Unicast Address (GUA)?

A

An IPv6 address that is globally routable and reachable on the Internet

GUAs are unique across the entire Internet.

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3
Q

What is a Link Local Address (LLA)?

A

An IPv6 address that is valid only within the local network segment

LLAs are used for communication within a single network segment and are not routable.

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4
Q

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

A

To request Router Advertisement (RA) messages from routers

This is part of the process for devices to discover routers and obtain network configuration information.

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5
Q

What does the Address Autoconfiguration Flag indicate?

A

It indicates whether a device should use SLAAC to create an IPv6 GUA

This flag is part of the RA message sent by routers.

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6
Q

What command enables IPv6 routing on a router?

A

ipv6 unicast-routing

This command must be executed in global configuration mode.

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7
Q

What command is used to define a DHCPv6 pool name?

A

ipv6 dhcp pool POOL-NAME

Replace POOL-NAME with the desired name for the DHCPv6 pool.

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8
Q

What is Duplicate Address Detection (DAD)?

A

A process used to ensure that an IPv6 address is unique on the network

DAD is implemented using ICMPv6 to prevent address conflicts.

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9
Q

What does the M flag indicate in Router Advertisements?

A

Whether to use a stateful DHCPv6 server to obtain an IPv6 GUA

If the M flag is set to 1, the client is instructed to contact a DHCPv6 server.

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10
Q

Fill in the blank: The command to configure a DHCPv6 server on an interface is _______.

A

ipv6 dhcp server POOL-NAME

This command binds the interface to the specified DHCPv6 pool.

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11
Q

What does the O flag indicate in Router Advertisements?

A

Whether to use a stateless DHCPv6 server for additional configuration parameters

If the O flag is set to 1, clients can request additional configuration from a DHCPv6 server.

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12
Q

What command is used to verify the DHCPv6 pool and its parameters?

A

show ipv6 dhcp pool

This command displays details about the configured DHCPv6 pool.

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13
Q

True or False: A Cisco IOS router can function as a DHCPv6 server, client, or relay agent.

A

True

Cisco IOS routers are versatile and can take on multiple roles in DHCPv6 configurations.

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14
Q

What is the purpose of the DHCPv6 Relay Agent?

A

To forward DHCPv6 messages between clients and servers on different networks

This is necessary when clients and servers are not on the same subnet.

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15
Q

What command is used to enable Stateless DHCPv6 on an interface?

A

ipv6 nd other-config-flag

This command sets the O flag to 1, allowing clients to obtain additional configuration from a DHCPv6 server.

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16
Q

What is the default behavior when SLAAC is enabled?

A

Hosts automatically create their own IPv6 GUA based on RA messages

SLAAC allows devices to generate their own addresses without needing a DHCPv6 server.

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17
Q

What command is used to verify if a router is enabled to send RA messages?

A

show ipv6 interface

This command checks the status of IPv6 on the router’s interfaces.

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18
Q

What is the primary function of the Neighbor Solicitation (NS) message?

A

To determine the link-layer address of a neighbor or to perform DAD

NS messages are essential for address resolution in IPv6.

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19
Q

What is the function of the DHCPv6 SOLICIT message?

A

To initiate communication with a DHCPv6 server and request configuration information

This message is sent by clients seeking IPv6 address and configuration details.

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20
Q

What command is used to configure the DHCPv6 relay destination?

A

ipv6 dhcp relay destination ipv6-address [interface-type interface-number]

This command specifies the address of the DHCPv6 server and the interface to use.

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21
Q

What is the role of the DHCPv6 Client?

A

To acquire an IPv6 configuration from a DHCPv6 server

A DHCPv6 client requests addressing and configuration parameters.

22
Q

What is the significance of the prefix length in an IPv6 address?

A

It indicates the number of bits used for the network portion of the address

The prefix length is essential for routing and subnetting.

23
Q

What does the command ‘ipv6 enable’ do on an interface?

A

Enables IPv6 processing on that interface

This command is necessary to allow the interface to participate in IPv6 networking.

24
Q

What is the function of the DHCPv6 ADVERTISE message?

A

To respond to a client’s SOLICIT message and provide available options

This message is part of the DHCPv6 communication process.

25
Q

What does the command ‘show ipv6 dhcp binding’ display?

A

It shows the binding of IPv6 addresses assigned to clients by the DHCPv6 server

This information is crucial for tracking address allocations.

26
Q

Fill in the blank: The command to verify that the DHCPv6 relay agent is operational is _______.

A

show ipv6 dhcp interface

This command checks the status of the DHCP relay agent’s interface.

27
Q

What is the purpose of Neighbor Advertisement (NA) messages?

A

To respond to Neighbor Solicitation messages and provide information about the sender

NA messages are part of the Neighbor Discovery Protocol in IPv6.

28
Q

What are the main objectives of the module on SLAAC and DHCPv6?

A

Configure dynamic address allocation in IPv6 networks

The objectives include explaining how an IPv6 host can acquire its IPv6 configuration through SLAAC and DHCPv6.

29
Q

What does SLAAC stand for?

A

Stateless Address Autoconfiguration

SLAAC enables hosts to create their own unique IPv6 global unicast address without needing a DHCPv6 server.

30
Q

What is the function of a DHCPv6 relay agent?

A

To forward DHCPv6 messages between clients and a DHCPv6 server on a different network

The relay agent configuration is similar to that of an IPv4 router as a DHCPv4 relay.

31
Q

What command is used to verify the operational status of a DHCPv6 relay agent?

A

show ipv6 dhcp interface

This command allows you to check the status of the DHCPv6 relay agent.

32
Q

What are the three flags included in an ICMPv6 Router Advertisement (RA) message?

A

A flag, O flag, M flag

These flags inform the host of the dynamic options available for IPv6 address configuration.

33
Q

What does the A flag in an RA message signify?

A

Use Stateless Address Autoconfiguration (SLAAC) to create an IPv6 GUA

This flag indicates that the host can create its own IPv6 address.

34
Q

What is the purpose of the O flag in an RA message?

A

Indicates that additional information is available from a stateless DHCPv6 server

This allows the host to seek further configuration parameters.

35
Q

What does the M flag in an RA message signify?

A

Use a stateful DHCPv6 server to obtain an IPv6 GUA

This flag tells the host to rely on a DHCPv6 server for address assignment.

36
Q

True or False: Stateful DHCPv6 requires SLAAC.

A

False

Stateful DHCPv6 does not depend on SLAAC; it can operate independently.

37
Q

What message does a host send to request an RA when using SLAAC?

A

Router Solicitation (RS) message

This message is sent to the IPv6 all-routers multicast address of ff02::2.

38
Q

What does a host do after receiving a Router Advertisement (RA) message?

A

It creates a unique IPv6 GUA using the provided network prefix

The host uses the information in the RA to configure its IPv6 address.

39
Q

Fill in the blank: The DHCPv6 server does not maintain a list of _______.

A

IPv6 address bindings

This characteristic defines the stateless nature of DHCPv6.

40
Q

What is the purpose of Duplicate Address Detection (DAD) in SLAAC?

A

To ensure that the IPv6 GUA is unique

DAD uses an ICMPv6 Neighbor Solicitation (NS) message to check for address conflicts.

41
Q

What is the default multicast address for all IPv6 routers?

A

ff02::2

This address is used by hosts to send RS messages to request RAs.

42
Q

What command is used to manually configure an IPv6 global unicast address on a router?

A

ipv6 address ipv6-address/prefix-length interface configuration command

This command is essential for setting up IPv6 addresses on router interfaces.

43
Q

How often does a router send ICMPv6 RA messages by default?

A

Every 200 seconds

Routers send RA messages periodically to assist hosts in autoconfiguring their IPv6 addresses.

44
Q

What is the role of a Stateless DHCPv6 server?

A

To provide configuration parameters without maintaining address bindings

It is used in conjunction with SLAAC to give additional information.

45
Q

What is the significance of the link-local address in IPv6?

A

It is automatically created by the host when it boots and the interface is active

The link-local address is used for local communication within the same network segment.

46
Q

What is the IPv6 address format for a link-local address?

A

fe80::/10

Link-local addresses begin with the prefix fe80::.

47
Q

How can a Windows host dynamically acquire an IPv6 GUA?

A

Through SLAAC or DHCPv6

Most Windows hosts are configured to dynamically obtain IPv6 addresses.

48
Q

What does the command ‘ipconfig /all’ do?

A

Displays all IPv6 addressing information for Windows hosts

This command helps verify what IPv6 configurations have been assigned.

49
Q

What does the term ‘Global Unicast Address (GUA)’ refer to?

A

An IPv6 address that is globally routable and unique

GUAs are essential for communication across the internet.

50
Q

What is the purpose of the ‘show ipv6 interface’ command?

A

To verify that a router has joined the IPv6 all-routers group

This command checks the router’s participation in the multicast group.

51
Q

What is the primary function of the DHCPv6 server?

A

To assign IPv6 addresses and provide configuration parameters to clients

DHCPv6 can operate in both stateful and stateless modes.

52
Q

What happens if a host receives a Neighbor Advertisement (NA) message during DAD?

A

The address is not unique, and the host must generate a new interface ID

This process ensures that each address used on the network is unique.

Routing (19 decks)

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