Modules 7 - 9: Available and Reliable Networks
68. The address pool of a DHCP server is configured with 172.21.121.0/25. The network administrator reserves 12 IP addresses for web servers. How many IP addresses are left in the pool to be assigned to other hosts?
114
60. 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?
116
32. The address pool of a DHCP server is configured with 10.92.71.0/25. The network administrator reserves 8 IP addresses for servers. How many IP addresses are left in the pool to be assigned to other hosts?
118
67. The address pool of a DHCP server is configured with 10.19.44.0/24. The network administrator reserves 6 IP addresses for servers. How many IP addresses are left in the pool to be assigned to other hosts?
248
63. The address pool of a DHCP server is configured with 10.7.30.0/24. The network administrator reserves 5 IP addresses for printers. How many IP addresses are left in the pool to be assigned to other hosts?
249
61. The address pool of a DHCP server is configured with 10.3.2.0/24. The network administrator reserves 3 IP addresses for printers. How many IP addresses are left in the pool to be assigned to other hosts?
251
66. The address pool of a DHCP server is configured with 10.19.44.0/24. The network administrator reserves 3 IP addresses for servers. How many IP addresses are left in the pool to be assigned to other hosts?
251
65. The address pool of a DHCP server is configured with 192.168.184.0/26. The network administrator reserves 18 IP addresses for access points. How many IP addresses are left in the pool to be assigned to other hosts?
44
62. The address pool of a DHCP server is configured with 172.23.143.0/26. The network administrator reserves 14 IP addresses for file servers. How many IP addresses are left in the pool to be assigned to other hosts?
48
15. 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.)
67 68
6. Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.)
67 DHCP
43. The address pool of a DHCP server is configured with 192.168.234.0/27. The network administrator reserves 22 IP addresses for IP phones. How many IP addresses are left in the pool to be assigned to other hosts?
8
11. A host PC is attempting to lease an address through DHCP. What message is sent by the server to let the client know it is able to use the provided IP information?
DHCPACK
4. Which DHCP IPv4 message contains the following information? Destination address: 255.255.255.255Client IPv4 address: 0.0.0.0Default gateway address: 0.0.0.0Subnet mask: 0.0.0.0
DHCPDISCOVER
1. A DHCP-enabled client PC has just booted. During which two steps will the client PC use broadcast messages when communicating with a DHCP server? (Choose two.)
DHCPDISCOVER DHCPREQUEST
8. Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server?
DHCPREQUEST
44. 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
31. Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv4 load sharing?
GLBP
51. Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv6 load balancing?
GLBP for IPv6
58. Which FHRP implementation is Cisco-proprietary and permits only one router in a group to forward IPv6 packets?
HSRP for IPv6
26. 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?
HSRP uses active and standby routers.
55. Which FHRP implementation is a nonproprietary protocol which relies on ICMP to provide IPv4 redundancy?
IRDP
17. What is an advantage of configuring a Cisco router as a relay agent?
It can provide relay services for multiple UDP services.
35. Which statement describes HSRP?
It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.
20. 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 and contact a DHCPv6 server for additional information.
54. 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)# ipv6 unicast-routing
45. Which command will allow a network administrator to check the IP address that is assigned to a particular MAC address?
Router# show ip dhcp binding
16. A client device on an Ethernet segment needs an IP address in order to communicate on the network. A DHCP server with IP address 192.168.1.1 has been configured and enabled on the network. How will a client device obtain a usable IP address for this network?
Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF.
14. 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?
Set the WAN connection in the wireless router as a DHCP client.
48. 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 15 IP addresses from being leased to DHCP clients.
3. When a client is requesting an initial address lease from a DHCP server, why is the DHCPREQUEST message sent as a broadcast?
The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.
12. What is one indication that a Windows computer did not receive an IPv4 address from a DHCP server?
The computer receives an IP address that starts with 169.254.
34. 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?
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.
59. Which FHRP implementation is a nonproprietary IPv4-only election protocol which has one master router per group?
VRRPv2
64. Which FHRP implementation is a nonproprietary IPv4-only election protocol with limited scalability?
VRRPv2
18. Which statement is true about DHCP operation?
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.
53. What is a result when the DHCP servers are not operational in a network?
Workstations are assigned with IP addresses in the 169.254.0.0/16 network.
10. Which kind of message is sent by a DHCP client when its IP address lease has expired?
a DHCPREQUEST unicast message
13. Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?
broadcast DHCPREQUEST
Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is the administrator trying to achieve?
configuring the router to obtain IP parameters from a DHCPv4 server
46. What is the reason that an ISP commonly assigns a DHCP address to a wireless router in a SOHO environment?
easy IP address management
9. Which command, when issued in the interface configuration mode of a router, enables the interface to acquire an IPv4 address automatically from an ISP, when that link to the ISP is enabled?
ip address dhcp
52. 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?
ip dhcp excluded-address 192.168.100.1 192.168.100.10ip dhcp excluded-address 192.168.101.254ip dhcp pool LAN-POOL-100network 192.168.100.0 255.255.254.0default-router 192.168.100.1
47. What information can be verified through the show ip dhcp binding command?
the IPv4 addresses that are assigned to hosts by the DHCP server
24. 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 link-local address of the router interface that is attached to the network
