A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

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Match the purpose with its DHCP message type. (Not all options are used.) Answers Explanation & Hints: The DHCPDISCOVER message is used to identify any DHCP servers on a network.…

Dynamic address assignment is an important feature of IPv6 due to the vast increase in address space over IPv4. In addition to static addressing, IPv6 provides two options for clients to obtain addresses dynamically: DHCPv6 (stateful) and stateless address auto-configuration (SLAAC).

SLAAC simplifies IPv6 address management by providing plug-and-play IP connectivity with no manual configuration of hosts. SLAAC enables an IPv6 client to generate its own addresses using a combination of locally-available information and information advertised by routers through Neighbor Discovery Protocol (NDP).

NDP messages are unsecured, which makes SLAAC susceptible to attacks that involve the spoofing (or forging) of link-layer addresses. You must configure SLAAC snooping to validate IPv6 clients using SLAAC before allowing them to access the network.

  • SLAAC Process
  • SLAAC Snooping

The client begins auto-configuration by generating a link-local address for the IPv6-enabled interface. This is done by combining the advertised link-local prefix (first 64 bits) with the interface identifier (last 64 bits). The address is generated according to the following format: [fe80 (10 bits) + 0 (54 bits)] + interface ID (64 bits).

Before assigning the link-local address to its interface, the client verifies the address by running Duplicate Address Detection (DAD). DAD sends a Neighbor Solicitation message destined to the new address. If there is a reply, then the address is a duplicate and the process stops. If the address is unique, it is assigned to the interface.

To generate a global address, the client sends a Router Solicitation message to prompt all routers on the link to send Router Advertisement (RA) messages. Routers that are enabled to support SLAAC send an RA that contains a subnet prefix for use by neighboring hosts. The client appends the interface identifier to the subnet prefix to form a global address, and again runs DAD to confirm its uniqueness.

SLAAC is subject to the same security vulnerabilities found in NDP. You can configure SLAAC snooping to secure traffic from IPv6 clients using SLAAC for dynamic address assignment. For more information on NDP, see IPv6 Neighbor Discovery Inspection.

SLAAC snooping is similar to DHCP snooping, in that it snoops packets to build a table of IP-MAC address bindings. SLAAC snooping extracts address information from DAD packets exchanged during the SLAAC process to build the SLAAC snooping table. The address bindings in this table are used to inspect and validate NDP/IP packets sent by IPv6 clients using SLAAC.

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CCNA 2 Chapter 10 v5 Exam Answers

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  1. 5. Match the descriptions to the corresponding DHCPv6 server type. (Not all options are used.)

    A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

    • enabled in RA messages with the ipv6 nd other-config-flag command (1)
    • clients send only DHCPv6 INFORMATION-REQUEST messages to the server (2)
    • enabled on the client with the ipv6 address autoconfig command (3)
    • the M flag is set to 1 in RA messages (4)
    • uses the address command to create a pool of addresses for clients (5)
    • enabled on the client with the ipv6 address dhcp command (6)

  2. 22. Order the steps of configuring a router as a DHCPv4 server. (Not all options are used.)

    A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

    • Configure a DHCP pool.
    • Exclude IP addresses.
    • Define the default gateway router

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

The router is configured for stateless DHCPv6 operation.

Is statless or statful DHCPv6 enabled in RA messages with the ipv6 nd other-config-flag command?

Which protocol supports Stateless Address Autoconfiguration (SLAAC) for dynamic assignment of IPv6 addresses to a host?

What is the third step in configuring a DHCPv4 Server on a router?

Define the default gateway router

Under which two circumstances would a router usually be configured as a DHCPv4 client?

The router is intended to be used as a SOHO gateway. This is an ISP requirement.

What is the second step in configuring a DHCPv4 Server on a router?

In statless or statful DHCPv6 is the M flag is set to 1 in RA messages?

Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?

An administrator wants to configure hosts to automatically assign IPv6 addresses to themselves by the use of Router Advertisement messages, but also to obtain the DNS server address from a DHCPv6 server. Which address assignment method should be configured?

The four steps in obtaining a lease are?

DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK (if success) DHCPDECLINE (if failure)

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

Add the ipv6 dhcp relay command to interface Fa0/0.

The DHCPv6 REPLY packet is what type? (broadcast, multicast, unicast)

The DHCPv6 ADVERTISE packet is what type? (broadcast, multicast, unicast)

A company uses the method SLAAC to configure IPv6 addresses for the workstations of the employees. A network administrator configured the IPv6 address on the LAN interface of the router. The interface status is UP. However, the workstations on the LAN segment did not obtain the correct prefix and prefix length. What else should be configured on the router that is attached to the LAN segment for the workstations to obtain the information?​

R1(config)# ipv6 unicast-routing

A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway?​

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

If the managed flag is set to 1 and the other flag is set to 0, what IPv6 dynamic addressing mode is used?

When a workstation boots, it sends a message to obtain an IP address. Which Layer 2 and Layer 3 destination addresses will the message contain?

FF-FF-FF-FF-FF-FF and 255.255.255.255

True / False: Automatic Allocation is permanent and has no lease?

Do statless or statful DHCPv6 clients send only DHCPv6 INFORMATION-REQUEST messages to the server?

A company implements the stateless DHCPv6 method for configuring IPv6 addresses on employee workstations. After a workstation receives messages from multiple DHCPv6 servers to indicate their availability for DHCPv6 service, which message does it send to a server for configuration information?

DHCPv6 INFORMATION-REQUEST

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

The router is configured for SLAAC DHCPv6 operation.

Does statless or statful DHCPv6 use the address command to create a pool of addresses for clients?

A host on the 10.10.100.0/24 LAN is not being assigned an IPv4 address by an enterprise DHCP server with the address 10.10.200.10/24. What is the best way for the network engineer to resolve this problem?

Issue the command ip helper-address 10.10.200.10 on the router interface that is the 10.10.100.0/24 gateway.

If the managed flag is set to 0 and the other flag is set to 1, what IPv6 dynamic addressing mode is used?

The DHCPv6 REQUREST packet is what type? (broadcast, multicast, unicast)

Is statless or statful DHCPv6 enabled on the client with the ipv6 address dhcp command?

What is the reason why the DHCPREQUEST message is sent as a broadcast during the DHCPv4 process?

To notify other DHCP servers on the subnet that the IP address was leased

A network administrator is implementing DHCPv6 for the company. The administrator configures a router to send RA messages with M flag as 1 by using the interface command ipv6 nd managed-config-flag. What effect will this configuration have on the operation of the clients?

Clients must use all configuration information that is provided by a DHCPv6 server.

If the managed and other flags are both set to 0, what IPv6 dynamic addressing mode is used?

What command twould exclude the first fifteen useable IP addresses from a DHCPv4 address pool of the network 10.0.15.0/24?

Router(config)# ip dhcp excluded-address 10.0.15.1 10.0.15.15

The configuration of the DHCP server has been confirmed as correct and the clients have network connectivity to other networks if a static IP address is configured on each one. What step should the engineer take next to solve the issue?

Confirm that ports on the Layer 2 LAN switch are configured as edge ports.

A network engineer is troubleshooting hosts on a LAN that are not being assigned an IPv4 address from a DHCP server after a new Ethernet switch has been installed on the LAN. The configuration of the DHCP server has been confirmed as correct and the clients have network connectivity to other networks if a static IP address is configured on each one. What step should the engineer take next to solve the issue?

It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information.

What is the first step in configuring a DHCPv4 Server on a router?

Which set of commands will configure a router as a DHCP server that will assign IPv4 addresses to the 192.168.100.0/23 LAN while reserving the first 10 and the last addresses for static assignment?

ip dhcp excluded-address 192.168.100.1 192.168.100.10 ip dhcp excluded-address 192.168.101.254 ip dhcp pool LAN-POOL-100 network 192.168.100.0 255.255.254.0 default-router 192.168.100.1 ************************

What are the three allocation medthods for IP addressing information?

Manual Allocation Automatic Allocation Dynamic Allocation

An administrator issues the commands: Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is the administrator trying to achieve?

configuring the router to obtain IP parameters from a DHCPv4 server

Is statless or statful DHCPv6 enabled on the client with the ipv6 address autoconfig command?

The DHCPv6 SOLICIT packet is what type? (broadcast, multicast, unicast)

Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm

show ip dhcp server statistics

A company uses the method slaac to configure ipv6 addresses for the workstations of the employees. a network administrator configured the ipv6 address on the lan interface of the router. the interface status is up. however, the workstations on the lan segm