lunes, 27 de julio de 2015

CCNA 2 Cisco v5.0 Chapter 10 - Answers



1. 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


2. 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


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

manual allocation
pre-allocation
automatic allocation
dynamic allocation


4. 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
to notify other hosts not to request the same IP address
for hosts on other subnets to receive the information
for routers to fill their routing tables with this new information


5. 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?

ipdhcp excluded-address 192.168.100.1 192.168.100.10
ipdhcp excluded-address 192.168.100.254
ipdhcp pool LAN-POOL-100
network 192.168.100.0 255.255.255.0
ip default-gateway 192.168.100.1
ipdhcp excluded-address 192.168.100.1 192.168.100.10
ipdhcp excluded-address 192.168.101.254
ipdhcp pool LAN-POOL-100
network 192.168.100.0 255.255.254.0
default-router 192.168.100.1
dhcp pool LAN-POOL-100
ipdhcp excluded-address 192.168.100.1 192.168.100.9
ipdhcp excluded-address 192.168.100.254
network 192.168.100.0 255.255.254.0
default-router 192.168.101.1
ipdhcp excluded-address 192.168.100.1 192.168.100.9
ipdhcp excluded-address 192.168.101.254
ipdhcp pool LAN-POOL-100
ip network 192.168.100.0 255.255.254.0
ip default-gateway 192.168.100.1


6. 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


7. 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.


8. 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?

Issue the ipconfig/release command on each client.
Issue the show ipdhcp binding command on the switch.
Confirm that ports on the Layer 2 LAN switch are configured as edge ports.
Issue the show interface command on the router to confirm that the LAN gateway is operational.


9. 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.
Issue the command default-router 10.10.200.10 at the DHCP configuration prompt on the 10.10.100.0/24 LAN gateway router.
Issue the command ip helper-address 10.10.100.0 on the router interface that is the 10.10.200.0/24 gateway.
Issue the command network 10.10.200.0 255.255.255.0 at the DHCP configuration prompt on the 10.10.100.0/24 LAN gateway router.


10. 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-if)# ipv6 enable
R1(config)# ipv6 unicast-routing
R1(config-if)# ipv6 nd other-config-flag
R1(config)# ipv6 dhcp pool


11. 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


12. 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.


13. 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


14. 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

15 Which protocol supports Stateless Address Autoconfiguration (SLAAC) for dynamic assignment of IPv6 addresses to a host?
ARPv6
DHCPv6
ICMPv6
UDP

16.

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


17. 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 the information that is contained in RA messages.
Clients must use all configuration information that is provided by a DHCPv6 server.
Clients must use the prefix and prefix length that are provided by a DHCPv6 server and generate a random interface ID.
Clients must use the prefix and prefix length that are provided by RA messages and obtain additional information from a DHCPv6 server.


18.

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.


19.

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.


20.

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 DHCPv6 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.


21. 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


22.

Place the options in the following order:

[+] 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
[#] 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
[+] Order does not matter within this group.
[#] Order does not matter within this group.


23.

Launch PT Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
How many IP addresses has the DHCP server leased and what is the number of DHCP pools configured? (Choose two.)

one pool
three leases
two pools
six pools
seven leases
five leases


24

Place the options in the following order:

[+] Step 2
[+] Step 1
– not scored –
[+] Step 3
– not scored -




Espero haber ayudado en algo. Hasta la próxima oportunidad!








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