Chapter 8: Dynamic Host Configuration Protocol (DHCP) (NetAcad) (Exam)
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? It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information. It should contact a DHCPv6 server for the prefix, the prefix-length information, and an interface ID that is both random and unique. It should use the information that is contained in the RA message exclusively. It should contact a DHCPv6 server for all the information that it needs.
(corrected) It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information. x0It should use the information that is contained in the RA message exclusively.
What two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.) DAD stateful DHCPv6 ARP EUI-64 random generation
(corrected) stateful DHCPv6 EUI-64 X-ARP
As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server? DHCPACK DHCPDISCOVER DHCPOFFER DHCPREQUEST
(corrected) DHCPREQUEST X-DHCPDISCOVER
How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method? It sends an ARP message with the IPv6 address as the destination IPv6 address. It checks with the IPv6 address database that is hosted by the SLAAC server. It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address. It contacts the DHCPv6 server via a special formed ICMPv6 message.
(corrected) It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address. X-It checks with the IPv6 address database that is hosted by the SLAAC 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 SOLICIT DHCPv6 REQUEST DHCPv6 INFORMATION-REQUEST DHCPv6 ADVERTISE
DHCPv6 INFORMATION-REQUEST
What is an advantage of configuring a Cisco router as a relay agent? It can forward both broadcast and multicast messages on behalf of clients. It will allow DHCPDISCOVER messages to pass without alteration. It reduces the response time from a DHCP server. It can provide relay services for multiple UDP services.
It can provide relay services for multiple UDP services.
*****DOESN'T INCLUDE CORRECTIONS FROM THE LATEST ATTEMPT--NOT ALL CORRECT**** 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 act as a DHCPv4 server configuring the router to resolve IP address conflicts configuring the router to act as a relay agent configuring the router to obtain IP parameters from a DHCPv4 server
configuring the router to obtain IP parameters from a DHCPv4 server
Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period? pre-allocation automatic allocation dynamic allocation manual allocation
dynamic allocation
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? SLAAC stateful DHCPv6 RA and EUI-64 stateless DHCPv6
stateless DHCPv6
What is used in the EUI-64 process to create an IPv6 interface ID on an IPv6 enabled interface? the MAC address of the IPv6 enabled interface an IPv6 address that is provided by a DHCPv6 server an IPv4 address that is configured on the interface a randomly generated 64-bit hexadecimal address
the MAC address of the IPv6 enabled interface
Under which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.) The router has a fixed IP address. The router is intended to be used as a SOHO gateway. The router is meant to provide IP addresses to the hosts. This is an ISP requirement. The administrator needs the router to act as a relay agent.
(corrected) The router is intended to be used as a SOHO gateway This is an ISP requirement X-The router is meant to provide IP addresses to the hosts. X-The administrator needs the router to act as a relay agent.
Which address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an address request? client IP address broadcast MAC address gateway IP address client hardware address
(corrected) client hardware address X-client IP address
Type a command to exclude the first fifteen useable IP addresses from a DHCPv4 address pool of the network 10.0.15.0/24. Router(config)# ip dhcp ___________.
(corrected) excluded-address X-255.255.255.240
A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway? the link-local address of the router interface that is attached to the network the unique local address of the router interface that is attached to the network the all-routers multicast address the global unicast address of the router interface that is attached to the network
(corrected) the link-local address of the router interface that is attached to the network X-the global unicast address of the router interface that is attached to the network
Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server? broadcast DHCPACK unicast DHCPACK broadcast DHCPREQUEST unicast DHCPREQUEST
(corrected) unicast DHCPREQUEST X-broadcast DHCPACK
(corrected) stateful DHCPv6 X-SLAAC
A router CLI prompt that says: R1# show running-config <output omitted> ! ipv6 dhcp pool IPV6 dns-server 2001:DB8:1234:5678::100 domain-name netacad.com ! interface FastEthernet0/0 <output omitted> ipv6 nd other-config-flag ipv6 dhcp server IPV6 ! <output omitted> Refer to the exhibit. Based on the output that is shown, what kind of IPv6 addressing is being configured? stateful DHCPv6 SLAAC stateless DHCPv6 static link-local
(corrected) Add the ipv6 dhcp relay command to interface Fa0/0. X-Change the ipv6 nd managed-config-flag command to ipv6 nd other-config-flag.
A router labeled RTR1 is connected to SW1 on its Fa0/0 interface and SW2 on its Fa0/1 interface. Both interfaces are labeled ":1". SW1 is connected to PC-A and SW2 is connected to DHCPv6 Server. The connection to SW1 is labeled 2001:DB8:1234:5678::/64 and the connection to SW2 is labeled 2001:DB8:1234:ABCD::/64. The DHCPv6 Server is also labeled 2001:DB8:1234:ABCD::10/64. There is a CLI output that says: RTR1# show running-config hostname RTR1 ! <output omitted> interface FastEthernet0/0 ip address dhcp duplex auto speed auto ipv6 address 2001:DB8:1234:5678::1/64 ipv6 nd managed-config-flag ! interface FastEthernet0/1 no ip address duplex auto speed auto ipv6 address 2001:DB8:1234:ABCD::1/64 ! <output omitted>Refer to the exhibit. What should be done to allow PC-A to receive an IPv6 address from the DHCPv6 server? Change the ipv6 nd managed-config-flag command to ipv6 nd other-config-flag. Add the ipv6 dhcp relay command to interface Fa0/0. Configure the ipv6 nd managed-config-flag command on interface Fa0/1. Add the IPv6 address 2001:DB8:1234:5678::10/64 to the interface configuration of the DHCPv6 server.
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? FF-FF-FF-FF-FF-FF and 255.255.255.255 MAC address of the DHCP server and 255.255.255.255 FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server both MAC and IPv4 addresses of the DHCP server
FF-FF-FF-FF-FF-FF and 255.255.255.255
(corrected) The router is configured for stateless DHCPv6 operation X-No virtual link-local address is configured.
Refer to the exhibit. A network administrator is implementing stateful DHCPv6 operation for the company. However, the clients are not using the prefix and prefix-length information that is configured in the DHCP pool. The administrator issues a show ipv6 interface command. What could be the cause of the problem? The router is configured for stateless DHCPv6 operation. The router is configured for SLAAC DHCPv6 operation. The Duplicate Address Detection feature is disabled. No virtual link-local address is configured.
(corrected) The clients cannot communicate with the DHCPv6 server, evidenced by the number of active clients being 0 X-The GigabitEthernet interface is not activated.
Refer to the exhibit. A network administrator is implementing the stateless DHCPv6 operation for the company. Clients are configuring IPv6 addresses as expected. However, the clients are not getting the DNS server address and the domain name information configured in the DHCP pool. What could be the cause of the problem? The router is configured for SLAAC operation. The GigabitEthernet interface is not activated. The clients cannot communicate with the DHCPv6 server, evidenced by the number of active clients being 0. The DNS server address is not on the same network as the clients are on.