CNT150:Chanpter 8: IPv6 GUA Assignment
Server to client DHCPv6 messages use UDP destination port ?
546
Client to server DHCPv6 messages use UDP detonation port?
547
What UDP port do DHCPv6 clients use to send DHCPv6 messages? 67 68 546 547
547
What does stateful mean when talking about dynamic GUA assignment?
A DHCPv6 server is managing the assignment of IPv6 addresses
This is the address Autoconfiguration Flag. Use Stateless Address Autoconfiguration (SLAAC) to create an IPv6 GUA
A flag
An ICMPv6 RA message includes three flags to identify the dynamic options available to a host, as follows:
A flag O flag M flag
What is a solicited-node multicast address?
A multicast address that is associated with a unicast IPv6 address. It starts with FF02::1:FF, with the last 6 hex digits being the last 6 hex digits of the unicast address.
What are the flag settings when a host should use the SLAAC only option? A=1, M=0, O=0 A=1, M=1, O=0 A=1, M=0, O=1 A=0, M=1, O=1
A=1, M=0, O=0
What flag settings combination is used for stateless DHCP? A=1, M=0, O=0 A=0, M=1, O=0 A=1, M=0, O=1 A=0, M=1, O=1
A=1, M=0, O=1
What method is used by a host to verify an IPv6 address is unique on the local network before assigning that address to an interface? ARP DAD PING SLAAC
DAD
Rotuer interface azquires an IPv6 IP configuration forma DHCPv6 server
DHCPv6 Client
Router provides DHCPv6 forwarding services when the client and the server are located on different netowokrs.
DHCPv6 Relay Agent
Router provides stateless or stateful DCHPV6 services
DHCPv6 Server
Cisco IOS can be configured Specifically, it can be configured to be one of the following:
DHCPv6 Server DHCPv6 Client DHCPv6 Relay Agent
When using the prefix from the RA message the client ca create its own interface ID using what two methods?
Extended Unique Identifier (EUI-640 Randomly Generated
How does dynamic GUA ASSIGNEMT work when using SLAAC only?
Host will use the information provided by the Router RA to configure all IPv6 addressing information including their own GUA.
DAD is implemented using what ?
ICMPv6
If no other devices respond with a NA message, then the address is what?
Is virtually guaranteed to be unique and can be used by the host. Note: If an NA message is received by the host the address is not unique and the operating system has to determine a new interface ID to use.
This i s the Managed Address Configuration flag. Use a staeful DHCPv6 server to obtain an IPv6 GUA
M flag
What M flag setting indicates that stateful DHCPv6 is used? M=0 M=1
M=1
What does stateless mean when talking about dynamic GUA assignment?
No device is tracking the assignment of IPV6 addresses
This is the Other Configuration Flag. Other information is available from stateless DHCPv6 server.
O flag
What DHCP v6 message does a host send to the DHCPv6 server if it is using stateful DHCPv6? ADVERTISE SOLICIT INFORMATION-REQUEST REQUEST
REQUEST
How does dynamic GUA ASSIGNEMT work when using Stateful DHCPv6?
Router RA messages inform hosts to contact a stateful DHCPv6 server or DHCPv6-enabled router for all IPV6 configuration information, EXCEPT THE DEFAULT GATEWAY ADDRESS Hosts contact a DHCPv6 server to acquire all of their IPv6 addressing info Hosts obtains default gateway information form router RA messages
How does dynamic GUA ASSIGNEMT work when using SLACC with DHCPv6 server?
Router RA messages provide IPv6 configuration information to hosts and inform them to contact a stateless DHCPv6 server for additional configuration info. Hosts use the RA info to create their own unique GUA and get additional info from a DHCPv6 server
Which ICMPv6 message is sent by the hosting an attempt to locate an online IPv6 enabled router to obtain IPv6 addressing information? Neighbor Advertisement (NA) Neighbor Solicitation (NS) Router Solicitation (RS) Router Advertisements (RA)
Router Solicitation
Which two ICMPv6 messages are used in the SLAAC process? (Choose two) Neighbor Advertisements (NA) Neighbor Solicitation (NS) Router Solicitation (RS) Router Advertisements (RA)
Router Solicitation (RS) Router Advertisements (RA)
By default which dynamic GUA assignment method is used when the IPV6 unicast-routing command is configured?
SLAAC only
Which method best describes stateless DHCP? SLAAC only SLAAC with stateless DHCPv6 server Stateful DHCPv6 Server
SLAAC with stateless DHCPv6 server
What DHCPv6 message odes a host send to look for DHCPv6 server? ADVERTISE SOLICIT INFORMATION-REQUEST REQUEST
SOLICIT
To perform DAD, the host does what?
Sends an ICMPv6 Neighbor Solicitation (NS) messaagee with a specially constructed multicast address, called a solicited-code multicast address.
PC1 sends an RS message to all IPV6-enabled router. What step of the DHCPv6 operations is this?
Step 1
There are five steps to configure and verify a router as a stateful DHCPv6 Client
Step 1. Enable IPv6 routing. Step 2. Configure the client router to create an LLA. Step 3. Configure the client router to use DHCPv6. Step 4. Verify that the client router is assigned a GUA. Step 5. Verify that the client router received other necessary DHCPv6 information.
There are five steps to configure and verify a router as a stateless DHCPv6 client.
Step 1. Enable IPv6 routing. Step 2. Configure the client router to create an LLA. Step 3. Configure the client router to use SLAAC. Step 4. Verify that the client router is assigned a GUA. Step 5. Verify that the client router received other necessary DHCPv6 information.
There are five steps to configure and verify a router as a stateful DHCPv6 server:
Step 1. Enable IPv6 routing. Step 2. Define a DHCPv6 pool name. Step 3. Configure the DHCPv6 pool. Step 4. Bind the DHCPv6 pool to an interface. Step 5. Verify that the hosts have received IPv6 addressing information.
There are five steps to configure and verify a router as a stateless DHCPv6 server:
Step 1. Enable IPv6 routing. Step 2. Define a DHCPv6 pool name. Step 3. Configure the DHCPv6 pool. Step 4. Bind the DHCPv6 pool to an interface. Step 5. Verify that the hosts have received IPv6 addressing information.
R1 receives the RS and responds with an RA indicating that the client is to initiate communication with a DHCPv6 server. What step of the DHCPv6 operations is this?
Step 2
The client, now a DCHPv6 client, needs to locate a DHCPv6 server and sends a DHCPv6 SOLICIT message to the reserved IPv6 multicast all-DHCPv6-servers address of ff02::1:2. This multicast address has a link-local scope, which means routers do not forward the messages to other networks. What step of the DHCPv6 operations is this?
Step 3
One or more DHPC6 servers respond with a DCHPv6 ADVERTISE unicast message. The ADVERTISE message informs the DHCPv6 client that the server is available for DHCPv6 service. What step of the DHCPv6 operations is this?
Step 4
What dhcpv6 config mode command is used to indicate the pool of addresses to be allocated by the server?
address prefix
What dhcpv6 config mode commands are used to set up DNS info?
dns-server dns ipv6 address domain-name name of domain
What interface mode command is used to enable automatic configuration of IPV6 addressing using SLAAC?
ipv6 address autoconfig
What interface config command is used to configure a client router to use DHCPv6?
ipv6 address dhcp
What global config mode command is used to create DHCPv6 pool?
ipv6 dhcp pool pool name
What global config command is used to create the DHCPv6 pool?
ipv6 dhcp pool pool-name
What interface config command is used to set a router interface as a DHCPv6 relay agent?
ipv6 dhcp relay destination next hop address and exit interface
What interface config command is used to bind a DHCPv6 pool to an interface?
ipv6 dhcp server pool name
What interface config mode command is used to bind a DHCPv6 pool to an interface?
ipv6 dhcp server pool-name
What interface config mode command is used to create a link local address without creating a GUA?
ipv6 enable
When setting an interface as stateful dhcpv6 server, what command needs be issued to turn of SLAAC?
ipv6 nd default no-autoconfig
What interface command is sued to enable stateful DHCPv6 on an interface?
ipv6 nd managed-config-flag
When setting an interface as stateful dhcpv6 server, what command needs be issued?
ipv6 nd managed-config-flag
What interface config mode command is used to manually enable stateless DHCPv6?
ipv6 nd other-config-flag
What interfaces config command is used to enable stateless DHCPv6 ?
ipv6 nd other-config-flag
What interface config command is used to disable SLAAC?
ipv6 nd prefix default no-autoconfig
To enable the sending of a RA messages, a router must join the IPV6 all routers group using what global config command?
ipv6 unicast-routing
What global config mode command is used to enable IPV6 routing on a cisco router?
ipv6 unicast-routing
Which command must be configured on a router to enable it to join the IPV6 all routers multicast address ff02::2? ip routing ipv6 unicast-routing ipv6 address ipv6-address/prefix-length ipv6 address ipv6-address link-local
ipv6-unicast routing
Which address type is automatically created by default on a host interface when no RAs are received? global unicast address link-local address MAC address
link-local address
What interface config commands is used to disable stateless dhcppv6?
no ipv6 nd other-config-flag
What show command output display the IPv6 link-local address of the client and the global unicast address assigned by the server?
show ipv6 dhcp biding
What show command can be used on a DHCPv6 configured router to verify if any hosts have been assigned an IPv6 configuration?
show ipv6 dhcp binding
Which show command on a relay agent can verify relay info?
show ipv6 dhcp interface
What show command is used to verify client router received other DHCP info?
show ipv6 dhcp interface interface id
What show command verifies the name of the DHCPv6 pool and its parameters and ids the number of active clients?
show ipv6 dhcp pool
What show command is used to verify client router is assigned a GUA?
show ipv6 interface brief
What show command is used to verify stateless dhcpv6 has been configured?
show ipv6 interface g0/0/1 | begin ND
How do you verify if a router is sending RA messages?
show ipv6 interface interface g0//01 | section Joined
The PC1 response depends on whether it is using stateful or stateless DHCPv6: Stateless DHCPv6 client - The client creates an IPv6 address using the prefix in the RA message and a self-generated Interface ID. The client then sends a DHCPv6 INFORMATION-REQUEST message to the DHCPv6 server requesting additional configuration parameters (e.g., DNS server address). Stateful DHCPv6 client - The client sends a DHCPv6 REQUEST message to the DHCPv6 server to obtain all necessary IPv6 configuration parameters. What step of the DHCPv6 operations is this?
Step 5
The server sends a DHCPv6 REPLY unicast message to the client. The content of the message varies depending on if it is replying to a REQUEST or INFORMATION-REQUEST message. Note: The client will use the source IPv6 Link-local address of the RA as its default gateway address. A DHCPv6 server does not provide this information. What step of the DHCPv6 operations is this?
Step 6
A host has the option to verify that a newly create ipv6 address is unique before it can be used. How is this done?
The Duplicate Address Detection (DAD) process is used by a host to ensure that the IPV6 GUA is unique.
The steps for DHCPv6 operations are as follows:
The host sends an RS message The router responds with an RA message The host sends a DHCPv6 SOLICIT message The DHCPv6 server responds with an ADVERTISE message The host responds to the DHCPv6 server The DHCPv6 server sends a REPLY message
The A-1 flag suggests to the client that it create its won IPv6 GUA using what?
The prefix advertised in the RA
True of False: The egress interface is only required when the next-hop address is an LLA
True
True or False: Host operating systems will at times show a link-local address appended with a % and number.
True, this is known as a ZONE ID or Scope ID. I t is used by the OS to associate the LLA with a specific interface
