Chapter 08 Exam Flashcards
What is an advantage of configuring a Cisco router as a relay agent?
It can provide relay services for multiple UDP services.
It will allow DHCPDISCOVER messages to pass without alteration.
It reduces the response time from a DHCP server.
It can forward both broadcast and multicast messages on behalf of clients.
It can provide relay services for multiple UDP services.
Which address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an address request?
client IP address
client hardware address
gateway IP address
broadcast MAC address
client hardware address
Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?
pre-allocation
manual allocation
dynamic allocation
automatic 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
RA and EUI-64
stateless DHCPv6
stateful DHCPv6
stateless DHCPv6
What is used in the EUI-64 process to create an IPv6 interface ID on an IPv6 enabled interface?
an IPv4 address that is configured on the interface
the MAC address of the IPv6 enabled interface
an IPv6 address that is provided by a DHCPv6 server
a randomly generated 64-bit hexadecimal address
the MAC address of the IPv6 enabled interface
How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method?
It contacts the DHCPv6 server via a special formed ICMPv6 message.
It checks with the IPv6 address database that is hosted by the SLAAC server.
It sends an ARP message with the IPv6 address as the destination IPv6 address.
It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.
It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.
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 resolve IP address conflicts
configuring the router to obtain IP parameters from a DHCPv4 server
configuring the router to act as a relay agent
configuring the router to act as a DHCPv4 server
configuring the router to obtain IP parameters from a DHCPv4 server
What two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.)
EUI-64
random generation
ARP
DAD
stateful DHCPv6
EUI-64
random generation
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 global unicast 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 link-local address of the router interface that is attached to the network
the link-local 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
broadcast DHCPREQUEST
unicast DHCPACK
unicast DHCPREQUEST
broadcast DHCPREQUEST
Under which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.)
This is an ISP requirement.
The router is meant to provide IP addresses to the hosts.
The router is intended to be used as a SOHO gateway.
The administrator needs the router to act as a relay agent.
The router has a fixed IP address.
This is an ISP requirement.
The router is intended to be used as a SOHO gateway.
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 exclusively.
It should contact a DHCPv6 server for all the information that it needs.
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 and contact a DHCPv6 server for additional information.
It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information.
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?
The Cisco router will exclude only the 10.0.15.1 and 10.0.15.15 IP addresses from being leased to DHCP clients.
The Cisco router will allow only the specified IP addresses to be leased to clients.
The Cisco router will automatically create a DHCP pool using a /28 mask.
The Cisco router will exclude 15 IP addresses from being leased to DHCP clients.
The Cisco router will exclude 15 IP addresses from being leased to DHCP clients.
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
both MAC and IPv4 addresses of the DHCP server
FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server
MAC address of the DHCP server and 255.255.255.255
FF-FF-FF-FF-FF-FF and 255.255.255.255
As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server?
DHCPREQUEST
DHCPDISCOVER
DHCPOFFER
DHCPACK
DHCPREQUEST
