Module 7-9

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? A: FF-FF-FF-FF-FF-FF and 255.255.255.255 B: both MAC and IPv4 addresses of the DHCP server C: FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server D: MAC address of the DHCP server and 255.255.255.255

A

A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement describes a feature that is associated with HSRP? A: HSRP uses active and standby routers. B: It uses ICMP messages in order to assign the default gateway to hosts. C: HSRP is nonproprietary. D: It allows load balancing between a group of redundant routers.

A

A small coffee shop is offering free Wi-Fi to customers. The network includes a wireless router and a DSL modem that is connected to the local phone company. What method is typically used to configure the connection to the phone company? A: Set the WAN connection in the wireless router as a DHCP client. B: Set the connection between the wireless router and the DSL modem as a private IP network. C: Set the DSL modem as a DHCP client to the phone company and a DHCP server for the internal connection. D: Set the DSL modem as a DHCP client to get a public IP address from the wireless router.

A

A company uses the SLAAC method to configure IPv6 addresses for the employee workstations. Which address will a client use as its default gateway? ​A: the global unicast address of the router interface that is attached to the network B: the unique local address of the router interface that is attached to the network C: the link-local address of the router interface that is attached to the network D: the all-routers multicast address

C

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? A: It should use the information that is contained in the RA message exclusively. B: It should contact a DHCPv6 server for all the information that it needs. C: It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information. D: It should contact a DHCPv6 server for the prefix, the prefix-length information, and an interface ID that is both random and unique.

C

What is the reason that an ISP commonly assigns a DHCP address to a wireless router in a SOHO environment? A: easy IP address management B: better network performance C: easy configuration on ISP firewall D: better connectivity

A

Which statement is true about DHCP operation?​ A: When a device that is configured to use DHCP boots, the client broadcasts a DHCPDISCOVER message to identify any available DHCP servers on the network.​ B: A client must wait for lease expiration before it sends another DHCPREQUEST message.​ C: If the client receives several DHCPOFFER messages from different servers, it sends a unicast DHCPREQUEST message to the server from which it chooses to obtain the IP information. D: The DHCPDISCOVER message contains the IP address and subnet mask to be assigned, the IP address of the DNS server, and the IP address of the default gateway.​

A

Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.) A: DHCP B: DNS C: SMB D: 53 E: 67 F: 80

A and E

Which command will allow a network administrator to check the IP address that is assigned to a particular MAC address? A: Router# show ip dhcp pool B: Router# show ip dhcp binding C: Router# show running-config I section_dhcp D: Router# show ip dhcp server statistics

B

After a host has generated an IPv6 address by using the DHCPv6 or SLAAC process, how does the host verify that the address is unique and therefore usable? A: The host checks the local neighbor cache for the learned address and if the address is not cached, it it considered unique. B: The host sends an ICMPv6 echo request message to the DHCPv6 or SLAAC-learned address and if no reply is returned, the address is considered unique. C: The host sends an ICMPv6 neighbor solicitation message to the DHCP or SLAAC-learned address and if no neighbor advertisement is returned, the address is considered unique. D: The host sends an ARP broadcast to the local link and if no hosts send a reply, the address is considered unique.

C

The address pool of a DHCP server is configured with 172.18.93.0/25. The network administrator reserves 10 IP addresses for web servers. How many IP addresses are left in the pool to be assigned to other hosts? A: 106 B: 120 C: 116 D: 114 E: 117

C

What is an advantage of configuring a Cisco router as a relay agent? A: It reduces the response time from a DHCP server. B: It will allow DHCPDISCOVER messages to pass without alteration. C: It can provide relay services for multiple UDP services. D: It can forward both broadcast and multicast messages on behalf of clients.

C

Which FHRP implementation is a nonproprietary protocol which relies on ICMP to provide IPv4 redundancy? A: VRRPv2 B: HSRP for IPv6 C: IRDP D: VRRPv3

C

Which kind of message is sent by a DHCP client when its IP address lease has expired?​ A: a DHCPREQUEST broadcast message​ B: a DHCPDISCOVER unicast message​ C: a DHCPREQUEST unicast message​ D: a DHCPDISCOVER broadcast message

C

A company uses DHCP to manage IP address deployment for employee workstations. The IT department deploys multiple DHCP servers in the data center and uses DHCP relay agents to facilitate the DHCP requests from workstations. Which two UDP ports are used to forward DHCP traffic? (Choose two.) A: 23 B: 53 C: 67 D: 68 E: 80

C and D

What information can be verified through the show ip dhcp binding command? A: the IPv4 addresses that have been excluded from the DHCPv4 pool B: the number of IP addresses remaining in the DHCP pool C: that DHCPv4 discover messages are still being received by the DHCP server D: the IPv4 addresses that are assigned to hosts by the DHCP server

D

Which statement describes HSRP?​ A: It uses ICMP to allow IPv4 hosts to locate routers that provide IPv4 connectivity to remote IP networks.​ B: If the virtual router master fails, one router is elected as the virtual router master with the other routers acting as backups. C: It is an open standard protocol. D: It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.

D

the client accepting the IP address provided by the DHCP server

DHCP Request

a client initiating a message to find a DHCP server

DHCP discover

a DHCP server responding to the initial request by a client

DHCP offer

the DHCP server confirming that the address lease has been accepted

DHCPACK