Cisco II Chapter 8 DHCP

FF02::1:2

A client sends a DHCPv6 SOLICIT message to the reserved IPv6 multicast all-DHCPv6-servers address ____________.

D) DHCPv6 INFORMATION-REQUEST

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? A) DHCPv6 REQUEST B) DHCPv6 ADVERTISE C) DHCPv6 SOLICIT D) DHCPv6 INFORMATION-REQUEST

C) FF-FF-FF-FF-FF-FF and 255.255.255.255

A company uses DHCP servers to dynamically assign IPv4 addresses to employee workstations. The address lease duration is set as 5 days. An employee returns to the office after an absence of one week. When the employee boots the workstation, it sends a message to obtain an IP address. Which Layer 2 and Layer 3 destination addresses will the message contain? A) both MAC and IPv4 addresses of the DHCP server B) FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server C) FF-FF-FF-FF-FF-FF and 255.255.255.255 D) MAC address of the DHCP server and 255.255.255.255

A) the link-local address of the router interface that is attached to the network

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) the link-local address of the router interface that is attached to the network B) the global unicast address of the router interface that is attached to the network C) the unique local address of the router interface that is attached to the network D) the all-routers multicast address

SLAAC

A method in which a device can obtain an IPv6 global unicast address without the services of a DHCPv6 server.

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

A network administrator configures a router to send RA messages with M flag as 0 and O flag as 1. Which statement describes the effect of this configuration when a PC tries to configure its IPv6 address? A) It should contact a DHCPv6 server for the prefix, the prefix-length information, and an interface ID that is both random and unique. B) It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information. C) It should use the information that is contained in the RA message exclusively. D) It should contact a DHCPv6 server for all the information that it needs.

C) The client should automatically configure an IPv6 address and then contact a DHCPv6 server for more information.

After booting, a client receives an ICMPv6 RA message with the M flag set to 0 and the O flag set to 1. What does this indicate? A) The client should request an IPv6 address directly from a DHCPv6 server. B) The client should automatically configure an IPv6 address without contacting a DHCPv6 server. C) The client should automatically configure an IPv6 address and then contact a DHCPv6 server for more information. D) The client should be statically configured with an IPv6 address because the local router does not support autoconfiguration.

FF02::2

An RS message is sent to IPv6 routers as an all-routers multicast to address __________.

D) The ip helper-address command is missing.

An administrator has configured a DHCPv4 relay router and issued these commands: Router(config)# interface g0/0 Router(config-if)# ip address 10.0.1.1 255.255.255.0 Router(config-if)# no shutdown Router(config-if)# exit Router(config)# ip dhcp pool RELAY Router(dhcp-config)# end The clients are not receiving IP parameters from the DHCPv4 server. What is a possible cause? A) The pool cannot be named 'RELAY'. B) The router is configured as a DHCPv4 client. C) The IP address is incorrect for the subnet mask that is used. D) The ip helper-address command is missing.

server event

An administrator is troubleshooting a DHCPv4 issue on a router. By issuing the debug ip dhcp ___________ command, the administrator can watch, in real time, the IP address assignments that are performed by the router.

A) configuring the router to obtain IP parameters from a DHCPv4 server

An administrator issues the commands: Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is the administrator trying to achieve? A) configuring the router to obtain IP parameters from a DHCPv4 server B) configuring the router to act as a relay agent C) configuring the router to act as a DHCPv4 server D) configuring the router to resolve IP address conflicts

C) stateless DHCPv6

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? A) stateful DHCPv6 B) RA and EUI-64 C) stateless DHCPv6 D) SLAAC

D) DHCPREQUEST

As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server? A) DHCPACK B) DHCPOFFER C) DHCPDISCOVER D) DHCPREQUEST

D) 8

By default, the ip helper-address command forwards how many UDP services? A) 5 B) 6 C) 7 D) 8 E) Yes

O flag is set to 1 M flag is set to 0

For stateless DHCPv6, the O flag is set to __ and the M flag is left at the default setting of __.

C) It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.

How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method? A) It contacts the DHCPv6 server via a special formed ICMPv6 message. B) It sends an ARP message with the IPv6 address as the destination IPv6 address. C) It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address. D) It checks with the IPv6 address database that is hosted by the SLAAC server.

SLAAC DHCPv6

Identify the two methods in which IPv6 global unicast addresses can be assigned.

ip dhcp pool <pool-name>

If you want to create a pool of addresses to assign, use this command.

ipv6 nd other-config-flag

In order to permit stateless DHCPv6 operation, which command must be entered?

A) 0.0.0.0

In the Ethernet Frame for a DHCPv4, unknown information in the CIADDR and GIADDR fields are marked as what? A) 0.0.0.0 B) 255.255.255.255 C) 127.0.0.1 D) 169.254.x.x E) fe80::/10

D) SLAAC

In which alternative to DHCPv6 does a router dynamically provide IPv6 configuration information to hosts? A) ARP B) EUI-64 C) ICMPv6 D) SLAAC

ICMP

On receiving the DHCPREQUEST, this protocol is used by the server to ping in order to ensure that the address is not being used.

A) Configure a DHCP pool. B) Exclude IP addresses. D) Define the default gateway router.

Order the steps of configuring a router as a DHCPv4 server. (Not all options are used.) A) Configure a DHCP pool. B) Exclude IP addresses. C) Configure the routing protocol. D) Define the default gateway router. E) Configure a secret password.

C) SOLICIT B) ADVERTISE D) REQUEST or INFORMATION-REQUEST A) REPLY

Put these DHCPv6 communications in order: A) REPLY B) ADVERTISE C) SOLICIT D) REQUEST or INFORMATION-REQUEST

FF02::1

RA messages are always sent to the IPv6 all-nodes multicast address ___________.

stateful DHCPv6 servers

RA messages that are sent from routers that are configured as _______ _________ _______ have the M flag set to 1 with the command ipv6 nd managed-config-flag.

C) DHCPDISCOVER B) DHCPOFFER A) DHCPREQUEST D) DHCPACK

Starting from step one, put the lease origination process in order. A) DHCPREQUEST B) DHCPOFFER C) DHCPDISCOVER D) DHCPACK

stateless

The O flag value of 1 is used to inform the client that additional configuration information is available from a __________ DHCPv6 server.

DHCPACK DHCPOFFER

The ____________ message is a duplicate of the _________________, except for a change in the message type field.

Client DHCPDISCOVER broadcast

The first step in the lease operation for DHCPv4 operation

Server DHCPACK broadcast

The forth step in the lease operation for DHCPv4 operation

Server DHCPOFFER broadcast

The second step in the lease operation for DHCPv4 operation

Client DHCPREQUEST broadcast

The third step in the lease operation for DHCPv4 operation

DHCPDISCOVER

This step in the lease origination process is a broadcast of the own device MAC address to discover available DHCPv4 servers.

ip address dhcp

To configure an Ethernet interface as a DHCP client, use this command.

show running-config | section dhcp

To display the output displays of the DHCPv4 commands configured on a router, use this command.

ip dhcp excluded-address

To exclude specific addresses, use this command.

Dude, it stands for STATELESS Address Autoconfiguration.... so it's false.

True or false, SLAAC is a stateful service.

True

True or false, SLAAC is the default option on Cisco routers.

True

True or false, in IPv6 if the M flag is set to 0 it means that the host should automatically configure its own IPv6 interface address rather than asking for one from a DHCPv6 server.

False, in IPv6 if the O flag is set to 1, it means that the client can find additional addressing information, such as a DNS server address, by contacting a DHCPv6 server after it has automatically configured its own address.

True or false, in IPv6 if the O flag is set to 0, it means that the client can find additional addressing information, such as a DNS server address, by contacting a DHCPv6 server after it has automatically configured its own address.

False

True or false, in SLAAC there is a server that knows which IPv6 addresses are being used and which ones are available.

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

Under which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.) A) The router is intended to be used as a SOHO gateway. B) This is an ISP requirement. C) The router is meant to provide IP addresses to the hosts. D) The router has a fixed IP address. E) The administrator needs the router to act as a relay agent.

FFFE

What are the 16 bits inserted in an EUI64 address?

0

What are the settings of the M and O flag in SLAAC?

D) It can provide relay services for multiple UDP services.

What is an advantage of configuring a Cisco router as a relay agent? A) It reduces the response time from a DHCP server. B) It will allow DHCPDISCOVER messages to pass without alteration. C) It can forward both broadcast and multicast messages on behalf of clients. D) It can provide relay services for multiple UDP services.

A) 255.255.255.255

What is the destination IP address when an IPv4 host sends a DHCPDISCOVER message? A) 255.255.255.255 B) 224.0.0.1 C) 0.0.0.0 D) 192.168.1.1

C) It is a SOHO or home broadband router.

What is the most likely scenario in which the WAN interface of a router would be configured as a DHCP client to be assigned a dynamic IP address from an ISP? A) There is a web server for public access on the LAN that is attached to the router. B) The router is also the gateway for a LAN. C) It is a SOHO or home broadband router. D) The router is configured as a DHCP server.

D) The Cisco router will exclude 15 IP addresses from being leased to DHCP clients.

What is the result of a network technician issuing the command ip dhcp excluded-address 10.0.15.1 10.0.15.15 on a Cisco router? A) The Cisco router will allow only the specified IP addresses to be leased to clients. B) The Cisco router will automatically create a DHCP pool using a /28 mask. C) The Cisco router will exclude only the 10.0.15.1 and 10.0.15.15 IP addresses from being leased to DHCP clients. D) The Cisco router will exclude 15 IP addresses from being leased to DHCP clients.

B) the MAC address of the IPv6 enabled interface

What is used in the EUI-64 process to create an IPv6 interface ID on an IPv6 enabled interface? A) an IPv4 address that is configured on the interface B) the MAC address of the IPv6 enabled interface C) an IPv6 address that is provided by a DHCPv6 server D) a randomly generated 64-bit hexadecimal address

A) DAD

What process is used in ICMPv6 for a host to verify that an IPv6 address is unique before configuring it on an interface? A) DAD B) SLAAC C) EUI-64 D) ARP

B) random generation E) EUI-64

What two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.) A) DAD B) random generation C) stateful DHCPv6 D) ARP E) EUI-64

D) The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.

When a client is requesting an initial address lease from a DHCP server, why is the DHCPREQUEST message sent as a broadcast? A) The client does not yet know the IP address of the DHCP server that sent the offer. B) The DHCP server may be on a different subnet, so the request must be sent as a broadcast. C) The client does not have a MAC address assigned yet, so it cannot send a unicast message at Layer 2. D) The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.

DHCPDISCOVER DHCPOFFER

When the DHCPv4 server receives a(n) ________________ message, it reserves an available IPv4 address to lease to the client. The server also creates an ARP entry consisting of the MAC address of the requesting client and the leased IPv4 address of the client. The DHCPv4 server then sends the binding ____________ message to the requesting client.

DHCPREQUEST

When used for lease origination, the ____________ serves as a binding acceptance notice to the selected server for the parameters it has offered and an implicit decline to any other servers that may have provided the client a binding offer.

B) broadcast DHCPREQUEST

Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server? A) unicast DHCPACK B) broadcast DHCPREQUEST C) broadcast DHCPACK D) unicast DHCPREQUEST

A) client hardware address

Which address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an address request? A) client hardware address B) broadcast MAC address C) gateway IP address D) client IP address

B) ipv6 address dhcp

Which command should be configured on a router interface to set the router as a stateful DHCPv6 client? A) ipv6 enable B) ipv6 address dhcp C) ipv6 address autoconfigure D) ipv6 dhcp server stateful

A) Router# show ip dhcp binding

Which command will allow a network administrator to check the IP address that is assigned to a particular MAC address? A) Router# show ip dhcp binding B) Router# show ip dhcp pool C) Router# show ip dhcp server statistics D) Router# show running-config I section_dhcp

A) FF02::1:2

Which destination IP address is used when an IPv6 host sends a DHCPv6 SOLICIT message to locate a DHCPv6 server? A) FF02::1:2 B) FF02::1 C) FE80::1 D) FF02::2

The M flag having a value of 1, the O flag is not involved.

Which flag indicates whether or not to use stateful or stateless DHCPv6?

A) dynamic allocation

Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period? A) dynamic allocation B) manual allocation C) automatic allocation D) pre-allocation

D) DHCPREQUEST

Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server? A) DHCPACK B) DHCPDISCOVER C) DHCPOFFER D) DHCPREQUEST

DHCPREQUEST

Which step in the DORA process is a message is sent in the form of a broadcast to inform a DHCPv4 server and any other DHCPv4 servers about an accepted offer.

Port 68

Which system port does DHCP client use?

Port 67

Which system port does DHCP server use?

Router Solicitation (RS) Router Advertisement (RA)

Which two messages does SLAAC use to provide addressing and other configurations?

DHCPREQUEST DHCPACK

Which two parts of the DORA process are used in the lease renewal?

Stateful DHCPv6 pools stateless DHCPv6 pools

_________ ____________ _________ are configured with address prefixes for hosts via the address command, whereas ________ ___________ ________ typically only contain information such as DNS server addresses and the domain name.

Stateless

___________ DHCPv6 servers are indicated by setting the O flag to 1 with the ipv6 nd other-config-flag command.