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Question 1 of 22
1. Question
1 pointsWhich DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?Correct
Incorrect
Hint
When a DHCP client receives DHCPOFFER messages, it will send a broadcast DHCPREQUEST message for two purposes. First, it indicates to the offering DHCP server that it would like to accept the offer and bind the IP address. Second, it notifies any other responding DHCP servers that their offers are declined. -
Question 2 of 22
2. Question
1 pointsA 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?Correct
Incorrect
Hint
When the lease of a dynamically assigned IPv4 address has expired, a workstation will send a DHCPDISCOVER message to start the process of obtaining a valid IP address. Because the workstation does not know the addresses of DHCP servers, it sends the message via broadcast, with destination addresses of FF-FF-FF-FF-FF-FF and 255.255.255.255. -
Question 3 of 22
3. Question
1 pointsWhich is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?Correct
Incorrect
Hint
Dynamic allocation is the most commonly implemented allocation mechanism. It leases the IP parameters for a predefined period of time. -
Question 4 of 22
4. Question
1 pointsWhich address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an address request?Correct
Incorrect
Hint
Which address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an addres -
Question 5 of 22
5. Question
1 pointsAs a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server?Correct
Incorrect
Hint
When a DHCP client lease is about to expire, the client sends a DHCPREQUEST message to the DHCPv4 server that originally provided the IPv4 address. This allows the client to request that the lease be extended. -
Question 6 of 22
6. Question
1 pointsWhat is an advantage of configuring a Cisco router as a relay agent?Correct
Incorrect
Hint
By default, the ip helper-address command forwards the following eight UDP services: Port 37: Time Port 49: TACACS Port 53: DNS Port 67: DHCP/BOOTP client Port 68: DHCP/BOOTP server Port 69: TFTP Port 137: NetBIOS name service Port 138: NetBIOS datagram service -
Question 7 of 22
7. Question
1 pointsAn administrator issues the commands: Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is the administrator trying to achieve?Correct
Incorrect
Hint
The ip address dhcp command activates the DHCPv4 client on a given interface. By doing this, the router will obtain the IP parameters from a DHCPv4 server. -
Question 8 of 22
8. Question
1 pointsUnder which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.)Correct
Incorrect
Hint
SOHO routers are frequently required by the ISP to be configured as DHCPv4 clients in order to be connected to the provider. -
Question 9 of 22
9. Question
1 pointsA company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway?Correct
Incorrect
Hint
When a PC is configured to use the SLAAC method for configuring IPv6 addresses, it will use the prefix and prefix-length information that is contained in the RA message, combined with a 64-bit interface ID (obtained by using the EUI-64 process or by using a random number that is generated by the client operating system), to form an IPv6 address. It uses the link-local address of the router interface that is attached to the LAN segment as its IPv6 default gateway address. -
Question 10 of 22
10. Question
1 pointsA 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?Correct
Incorrect
Hint
ICMPv6 RA messages contain two flags to indicate whether a workstation should use SLAAC, a DHCPv6 server, or a combination to configure its IPv6 address. These two flags are M flag and O flag. When both flags are 0 (by default), a client must only use the information in the RA message. When M flag is 0 and O flag is 1, a client should use the information in the RA message and look for the other configuration parameters (such as DNS server addresses) on DHCPv6 servers. -
Question 11 of 22
11. Question
1 pointsA 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?Correct
Incorrect
Hint
In stateless DHCPv6 configuration, a client configures its IPv6 address by using the prefix and prefix length in the RA message, combined with a self-generated interface ID. It then contacts a DHCPv6 server for additional configuration information via an INFORMATION-REQUEST message. The DHCPv6 SOLICIT message is used by a client to locate a DHCPv6 server. The DHCPv6 ADVERTISE message is used by DHCPv6 servers to indicate their availability for DHCPv6 service. The DHCPv6 REQUEST message is used by a client, in the stateful DHCPv6 configuration, to request ALL configuration information from a DHCPv6 server. -
Question 12 of 22
12. Question
1 pointsAn 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?Correct
Incorrect
Hint
Stateless DHCPv6 allows clients to use ICMPv6 Router Advertisement (RA) messages to automatically assign IPv6 addresses to themselves, but then allows these clients to contact a DHCPv6 server to obtain additional information such as the domain name and address of DNS servers. SLAAC does not allow the client to obtain additional information through DHCPv6, and stateful DHCPv6 requires that the client receive its interface address directly from a DHCPv6 server. RA messages, when combined with an EUI-64 interface identifier, are used to automatically create an interface IPv6 address, and are part of both SLAAC and stateless DHCPv6. -
Question 13 of 22
13. Question
1 pointsHow does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method?Correct
Incorrect
Hint
SLAAC is a stateless allocation method and does not use a DHCP server to manage the IPv6 addresses. When a host generates an IPv6 address, it must verify that it is unique. The host will send an ICMPv6 Neighbor Solicitation message with its own IPv6 address as the target. As long as no other device responds with a Neighbor Advertisement message, then the address is unique. -
Question 14 of 22
14. Question
1 pointsWhat is used in the EUI-64 process to create an IPv6 interface ID on an IPv6 enabled interface?Correct
Incorrect
Hint
The EUI-64 process uses the MAC address of an interface to construct an interface ID (IID). Because the MAC address is only 48 bits in length, 16 additional bits (FF:FE) must be added to the MAC address to create the full 64-bit interface ID. -
Question 15 of 22
15. Question
1 pointsWhat two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.)Correct
Incorrect
Hint
A host that is using SLAAC has two means to configure an interface ID: EUI-64 and random generation by the host operating system. -
Question 16 of 22
16. Question
1 pointsRefer to the exhibit. Based on the output that is shown, what kind of IPv6 addressing is being configured?
Correct
Incorrect
Hint
Stateful DHCPv6 pools are configured with address prefixes for hosts via the address command, whereas stateless DHCPv6 pools typically only contain information such as DNS server addresses and the domain name. RA messages that are sent from routers that are configured as stateful DHCPv6 servers have the M flag set to 1 with the command ipv6 nd managed-config-flag, whereas stateless DHCPv6 servers are indicated by setting the O flag to 1 with the ipv6 nd other-config-flag command. -
Question 17 of 22
17. Question
1 pointsRefer to the exhibit. What should be done to allow PC-A to receive an IPv6 address from the DHCPv6 server?
Correct
Incorrect
Hint
Client DHCPv6 messages are sent to a multicast address with link-local scope, which means that the messages will not be forwarded by routers. Because the client and server are on different subnets on different interfaces, the message will not reach the server. The router can be configured to relay the DHCPv6 messages from the client to the server by configuring the ipv6 dhcp relay command on the interface that is connected to the client. -
Question 18 of 22
18. Question
1 pointsRefer 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?
Correct
Incorrect
Hint
The router is configured for stateless DHCPv6 operation, which is shown by the last two lines of the show command output. Hosts will configure their IPv6 addresses by using the prefix information that is provided by RA messages. They will also obtain additional configuration information from a DHCPv6 server. The “No virtual link-local address” option and the “Duplicate Address Detection” option are irrelevant to DHCP configuration. Option “SLAAC configuration” is incorrect because by definition SLAAC will use only the information that is provided by RA messages to configure IPv6 settings. -
Question 19 of 22
19. Question
1 pointsRefer 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?
Correct
Incorrect
Hint
The router is configured for SLAAC operation because there is no configuration command to change the RA M and O flag value. By default, both M and O flags are set to 0. In order to permint stateless DHCPv6 operation, the interface command ipv6 nd other-config-flag should be issued. The GigabitEthernet interface is in working condition because clients can get RA messages and configure their IPv6 addresses as expected. Also, the fact that R1 is the DHCPv6 server and clients are getting RA messages indicates that clients can communicate with the DHCP server. The number of active clients is 0 because the DHCPv6 server does not maintain the state of clients IPv6 addresses (it is not configured for stateful DHCPv6 operation). The DNS server address issue is not relevant to the problem. -
Question 20 of 22
20. Question
1 pointsFill 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*)
Correct
Incorrect
Hint
The ip dhcp excluded-address command must be followed by the first and the last addresses to be excluded. -
Question 21 of 22
21. Question
1 pointsOrder the steps of configuring a router as a DHCPv4 Server. (Not all options are used.)
Sort elements
- exclude IP addresses
- configure a DHCP pool
- Define the default gateway router
- configure the routing protocol
- configure a secret password
-
Step 1
-
Step 2
-
Step 3
Correct
Incorrect
-
Question 22 of 22
22. Question
1 pointsMatch the description to the corresponding DHCPv6 server type. (Not all options are used.)
Sort elements
- 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
- client communicate with the DHCPv6 server by the use of RA messages
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Staleless DHCPv6
-
Staleless DHCPv6
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Staleless DHCPv6
-
Stateful DHCPv6
-
Stateful DHCPv6
-
Stateful DHCPv6
Correct
Incorrect
Hint
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.
