Hoofdstuk 8 Flashcards
Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?
unicast DHCPACK broadcast DHCPACK unicast DHCPREQUEST broadcast DHCPREQUEST
broadcast DHCPREQUEST
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 MAC address of the DHCP server and 255.255.255.255 FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server
FF-FF-FF-FF-FF-FF and 255.255.255.255
Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?
manual allocation pre-allocation automatic allocation dynamic allocation
dynamic allocation
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
As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server?
DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK
DHCPREQUEST
What is an advantage of configuring a Cisco router as a relay agent?
It will allow DHCPDISCOVER messages to pass without alteration. It can forward both broadcast and multicast messages on behalf of clients. It can provide relay services for multiple UDP services. It reduces the response time from a DHCP server.
It can provide relay services for multiple UDP services.
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 obtain IP parameters from a DHCPv4 server configuring the router to act as a relay agent configuring the router to resolve IP address conflicts
configuring the router to obtain IP parameters from a DHCPv4 server
Under which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.)
The router is intended to be used as a SOHO gateway. The administrator needs the router to act as a relay agent. The router is meant to provide IP addresses to the hosts. This is an ISP requirement. The router has a fixed IP address.
The router is intended to be used as a SOHO gateway.
This is an ISP requirement.
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 all-routers multicast address 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 global unicast 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
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 contact a DHCPv6 server for all the information that it needs. It should use the information that is contained in the RA message exclusively. 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 and contact a DHCPv6 server for additional information.
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 ADVERTISE DHCPv6 INFORMATION-REQUEST
DHCPv6 INFORMATION-REQUEST
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 stateless DHCPv6 stateful DHCPv6 RA and EUI-64
stateless DHCPv6
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 contacts the DHCPv6 server via a special formed ICMPv6 message. 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.
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 a randomly generated 64-bit hexadecimal address an IPv6 address that is provided by a DHCPv6 server an IPv4 address that is configured on the interface
the MAC address of the IPv6 enabled interface
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
stateful DHCPv6
DAD
ARP
EUI-64
random generation
Refer to the exhibit. Based on the output that is shown, what kind of IPv6 addressing is being configured?
SLAAC stateful DHCPv6 stateless DHCPv6 static link-local
stateless DHCPv6
Refer to the exhibit. What should be done to allow PC-A to receive an IPv6 address from the DHCPv6 server?
Add the ipv6 dhcp relay command to interface Fa0/0. Configure the ipv6 nd managed-config-flag command on interface Fa0/1. Change the ipv6 nd managed-config-flag command to ipv6 nd other-config-flag. Add the IPv6 address 2001:DB8:1234:5678::10/64 to the interface configuration of the DHCPv6 server.
Add the ipv6 dhcp relay command to interface Fa0/0.
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?
No virtual link-local address is configured. The Duplicate Address Detection feature is disabled. The router is configured for SLAAC DHCPv6 operation. The router is configured for stateless DHCPv6 operation
The router is configured for stateless DHCPv6 operation
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 GigabitEthernet interface is not activated. The router is configured for SLAAC operation. The DNS server address is not on the same network as the clients are on. The clients cannot communicate with the DHCPv6 server, evidenced by the number of active clients being 0.
The router is configured for SLAAC operation.
Fill in the blank. Do not abbreviate.
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 excluded-address
10.0.15.1 10.0.15.15
MATCH:
Step 1
Step 2
Step 3
Configure a DHCP pool Exclude IP addresses. Configure the routing protocol. Define the default gateway router Configure a secret password.
step 1 –> exclude ip addresses
step 2 –> configure a dhcp pool
step 3 –> define the default gateway router
MATCH:
enabled in RA messages with the ipv6 nd other-config-flag command
clients communicate with the DHCPV6 server by the use of RA messages
the M flag is set to 1 in RA messages
uses the address command to create a pool of addresses for clients
clients send only DHCPv6 INFORMATION-REQUEST messages to the server
enabled on the client with the IPv6 address dhcp command
enabled on the client with the ipv6 address autoconfig command
Stateless DHCPv6 Target Target Target Stateful DHCPv6 Target Target Target
Stateless DHCPv6:
enabled in RA messages with the ipv6 nd other-config-flag command
clients send only DHCPv6 INFORMATION-REQUEST messages to the server
enabled on the client with the ipv6 address autoconfig command
Stateful DHCPv6:
the M flag is set to 1 in RA messages
uses the address command to create a pool of addresses for clients
enabled on the client with the IPv6 address dhcp command
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 automatically create a DHCP pool using a /28 mask.
The Cisco router will allow only the specified IP addresses to be leased to clients.
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 exclude 15 IP addresses from being leased to DHCP clients.
The Cisco router will exclude 15 IP addresses from being leased to DHCP clients.
Which of the following describes the automatic IP addressing mechanism when configuring a DHCP server?
A network administrator assigns an IP address to a client
A client is assigned an IP address for a limited amount of time
A non-expiring IP address is assigned to a client
A client is assigned an IP address for a limited amount of time
Which statements are true about the DHCP server functions? (Choose two.)
When a client requests an IP address, the DHCP server searches the binding table for an entry that matches the client’s MAC address) If an entry exists, the corresponding IP address for the entry is returned to the client.
Clients can be assigned an IP address from a predefined DHCP pool for a finite lease period.
DHCP services must be installed on a dedicated network server to define the pool of IP addresses available to the client.
The DHCP server can answer requests and assign IP addresses for a particular subnet only.
Each subnet in the network requires a dedicated DHCP server to assign IP addresses to the host on the subnet.
DHCP provides clients with an IP address, a subnet mask, a default gateway, and optionally, a domain name.
Clients can be assigned an IP address from a predefined DHCP pool for a finite lease period.
DHCP provides clients with an IP address, a subnet mask, a default gateway, and optionally, a domain name.
What must happen if a DHCP IP conflict occurs?
Proxy ARP will fix the issue
The client uses a gratuitous ARP to fix the issue
The administrator must fix the conflict manually
The DHCP server will issue new IP addresses to both hosts
The administrator must fix the conflict manually
Which DHCP message types are originated by a DHCPv4 server? (Select all that apply.)
DHCPREQUEST
DHCPLEASE
DHCPACK
DHCPDISCOVER
DHCPREPLY
DHCPOFFER
DHCPACK
DHCPOFFER
You want to implement a mechanism that automates IP configuration, including IP address, subnet mask, default gateway, and DNS information) Which protocol will you use to accomplish this?
SMTP
ARP
AARP
DHCP
DHCP
Consider the following configuration: ‘R1(config)# ip dhcp pool 192.168.10.0’ What is the function of the 192.168.10.0 argument?
Name of the DCHP pool
Pool of IP addresses available for lease
Range of excluded IP addresses
Subnet where the DHCP server resides
Name of the DCHP pool
Which of the following describe the DHCP Discover message? (Choose Two)
It uses FF:FF:FF:FF:FF:FF as a layer-2 broadcast
It uses UDP as the Transport layer protocol
It uses TCP as the Transport layer protocol
It does not use a layer-2 destination address
It uses FF:FF:FF:FF:FF:FF as a layer-2 broadcast
It uses UDP as the Transport layer protocol
Which two methods of assigning an IPv6 address to a router interface are automatic and can be used in conjunction with one another? (Choose two.)
EUI-64
Static assignment
DNS
DHCPv6
Stateless autoconfiguration
DHCPv6
Stateless autoconfiguration
Which three statements about DHCPv4 are true? (Choose three.)
DHCP messages use UDP as a transport protocol.
The DHCPOFFER message is sent by a DHCP server after receiving a DHCPDISCOVER message from a client.
DHCP uses ports 67 and 68.
The DHCPREQUEST message is sent by a DHCP client to locate a DHCP server.
The DHCPACK message is sent by the DHCP server to provide the DHCP client with the DHCP server MAC address for further communications.
All DHCP communications are broadcast.
DHCP messages use UDP as a transport protocol.
The DHCPOFFER message is sent by a DHCP server after receiving a DHCPDISCOVER message from a client.
DHCP uses ports 67 and 68.
In which order do the four DHCPv4 steps occur?
DHCPREQUEST DHCPACK DHCPOFFER DHCPDISCOVER
DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK
DHCPACK DHCPREQUEST DHCPOFFER DHCPDISCOVER
DHCPOFFER DHCPREQUEST DHCPDISCOVER DHCPACK
DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK
Why is the DHCPREQUEST message sent as a broadcast during the DHCPv4 process
C. To notify other DHCP servers on the subnet that the IP address was leased
Which address does a DHCPv4 server target when sending a DHCPoffer message to a client that makes an address request?
B. Client Hardware address
As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server?
D. DHCPREQUEST
What is an advantage of configuring a Cisco router as a relay agent?
B. It can provide relay services for multiple UDP services
An administrator issues the ip address dhcp command on interface G0/1. What is the administrator trying to achieve?
C. Configuring the router to obtain IP parameters from a DHCPv4 server
Under which 2 circumstance would a router usually be configured as a DHCPv4 client choose 2?
B AN D
This is an ISP requirement
The router is intended to be used as a SOHO gateway
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?
C. Issue the command ip helper-address 10.10.200.10 on the router interface that is the 10.10.100.0/24 gateway.
A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway?
C. The link-local address of the router interface that is attached to the network.
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?
C. It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information
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
B. DHCPv6 information-request
An administrator wants to configure hosts to automatically assign IPv6 addresses to themselves through 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?
D. Stateless DHCPv6
How does an IPv6 client ensure that it has a unigue address after it configures its IPv6 address using SLAAC allocation method?
D. It sends an ICMPv6 neighbor solicitation message with the IPv6 address as the target address
What is used in the EUI-64 process to create an IPv6 interface ID on an IPv6-enabled interface?
D. The MAC address of the IPv6 enabled interface
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?
A. Clients must use all configuration information that is provided by a DHCPv6 server.
