CCNA 2 v7 Modules 7 – 9: Available and Reliable Networks
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45 Terms
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
DHCPACK
DHCPOFFER
DHCPREQUEST
DHCPNAK
DHCPDISCOVER
DHCPREQUEST
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
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 does not yet know the IP address of the DHCP server that sent the offer.
The DHCP server may be on a different subnet, so the request must be sent as a broadcast.
The client does not have a MAC address assigned yet, so it cannot send a unicast message at Layer 2.
The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.
The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.
4. Which DHCP IPv4 message contains the following information?
Destination address: 255.255.255.255
Client IPv4 address: 0.0.0.0
Default gateway address: 0.0.0.0
Subnet mask: 0.0.0.0
DHCPACK
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPDISCOVER
6. Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.)
DHCP
DNS
SMB
53
67
80
DHCP
67
8. Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server?
DHCPOFFER
DHCPDISCOVER
DHCPREQUEST
DHCPACK
DHCPREQUEST
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?
service dhcp
ip address dhcp
ip helper-address
ip dhcp pool
ip address dhcp
10. Which kind of message is sent by a DHCP client when its IP address lease has expired?
a DHCPDISCOVER unicast message
a DHCPREQUEST broadcast message
a DHCPREQUEST unicast message
a DHCPDISCOVER broadcast message
a DHCPREQUEST unicast message
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?
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
DHCPACK
DHCPNACK
DHCPACK
12. What is one indication that a Windows computer did not receive an IPv4 address from a DHCP server?
The computer cannot ping 127.0.0.1.
The computer receives an IP address that starts with 169.254.
Windows displays a DHCP timeout message.
The computer cannot ping other devices on the same network with IP addresses in the 169.254.0.0/16 range.
The computer receives an IP address that starts with 169.254.
13. Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?
broadcast DHCPACK
broadcast DHCPREQUEST
unicast DHCPACK
unicast DHCPREQUEST
broadcast DHCPREQUEST
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.
Set the connection between the wireless router and the DSL modem as a private IP network.
Set the DSL modem as a DHCP client to get a public IP address from the wireless router.
Set the DSL modem as a DHCP client to the phone company and a DHCP server for the internal connection.
Set the WAN connection in the wireless router as a DHCP client.
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.)
23
53
67
68
80
67
68
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 DHCPACK packet to the default gateway address.
Use a statically configured IP address from the pool of IP addresses that is offered by the DHCP server.
Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF.
Send a DHCPREQUEST packet to IP address 255.255.255.255.
Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF.
17. What is an advantage of configuring a Cisco router as a relay agent?
It can provide relay services for multiple UDP services.
It reduces the response time from a DHCP server.
It can forward both broadcast and multicast messages on behalf of clients.
It will allow DHCPDISCOVER messages to pass without alteration.
It can provide relay services for multiple UDP services.
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.
A client must wait for lease expiration before it sends another DHCPREQUEST message.
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.
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.
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.
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 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.
It should use the information that is contained in the RA message exclusively.
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 and contact a DHCPv6 server for additional information.
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 global unicast 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 all-routers multicast address
the link-local 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
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.
HSRP is nonproprietary.
It allows load balancing between a group of redundant routers.
It uses ICMP messages in order to assign the default gateway to hosts.
HSRP uses active and standby routers.
31. Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv4 load sharing?
IRDP
GLBP
VRRPv3
GLBP for IPv6
GLBP
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?
122
118
119
108
116
118
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 echo request message to the DHCPv6 or SLAAC-learned address and if no reply is returned, the address is considered unique.
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.
The host checks the local neighbor cache for the learned address and if the address is not cached, it it considered unique.
The host sends an ARP broadcast to the local link and if no hosts send a reply, the address is considered unique.
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.
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.
It uses ICMP to allow IPv4 hosts to locate routers that provide IPv4 connectivity to remote IP networks.
If the virtual router master fails, one router is elected as the virtual router master with the other routers acting as backups.
It is an open standard protocol.
It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.
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?
10
0
8
21
18
8
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?
both MAC and IPv4 addresses of the DHCP server
FF-FF-FF-FF-FF-FF and IPv4 address of the DHCP server
FF-FF-FF-FF-FF-FF and 255.255.255.255
MAC address of the DHCP server and 255.255.255.255
FF-FF-FF-FF-FF-FF and 255.255.255.255
45. Which command will allow a network administrator to check the IP address that is assigned to a particular MAC address?
Router# show running-config I section_dhcp
Router# show ip dhcp server statistics
Router# show ip dhcp binding
Router# show ip dhcp pool
Router# show ip dhcp binding
46. What is the reason that an ISP commonly assigns a DHCP address to a wireless router in a SOHO environment?
better network performance
better connectivity
easy IP address management
easy configuration on ISP firewall
easy IP address management
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
that DHCPv4 discover messages are still being received by the DHCP server
the IPv4 addresses that have been excluded from the DHCPv4 pool
the number of IP addresses remaining in the DHCP pool
the IPv4 addresses that are assigned to hosts by the DHCP server
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 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 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 15 IP addresses from being leased to DHCP clients.
51. Which FHRP implementation is a Cisco-proprietary protocol that suppports IPv6 load balancing?
GLBP
GLBP for IPv6
VRRPv3
VRRPv2
GLBP for IPv6
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 192.168.100.1 192.168.100.9
ip dhcp excluded-address 192.168.101.254
ip dhcp pool LAN-POOL-100
ip network 192.168.100.0 255.255.254.0
ip default-gateway 192.168.100.1
dhcp pool LAN-POOL-100
ip dhcp excluded-address 192.168.100.1 192.168.100.9
ip dhcp excluded-address 192.168.100.254
network 192.168.100.0 255.255.254.0
default-router 192.168.101.1
ip dhcp excluded-address 192.168.100.1 192.168.100.10
ip dhcp excluded-address 192.168.100.254
ip dhcp pool LAN-POOL-100
network 192.168.100.0 255.255.255.0
ip default-gateway 192.168.100.1
ip dhcp excluded-address 192.168.100.1 192.168.100.10
ip dhcp excluded-address 192.168.101.254
ip dhcp pool LAN-POOL-100
network 192.168.100.0 255.255.254.0
default-router 192.168.100.1
ip dhcp excluded-address 192.168.100.1 192.168.100.10
ip dhcp excluded-address 192.168.101.254
ip dhcp pool LAN-POOL-100
network 192.168.100.0 255.255.254.0
default-router 192.168.100.1
53. What is a result when the DHCP servers are not operational in a network?
Workstations are assigned with the IP address 127.0.0.1.
Workstations are assigned with IP addresses in the 10.0.0.0/8 network.
Workstations are assigned with IP addresses in the 169.254.0.0/16 network.
Workstations are assigned with the IP address 0.0.0.0.
Workstations are assigned with IP addresses in the 169.254.0.0/16 network.
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 dhcp pool
R1(config-if)# ipv6 enable
R1(config)# ipv6 unicast-routing
R1(config-if)# ipv6 nd other-config-flag
R1(config)# ipv6 unicast-routing
55. Which FHRP implementation is a nonproprietary protocol which relies on ICMP to provide IPv4 redundancy?
VRRPv3
GLBP for IPv6
IRDP
GLBP
IRDP
58. Which FHRP implementation is Cisco-proprietary and permits only one router in a group to forward IPv6 packets?
VRRPv3
HSRP
HSRP for IPv6
VRRPv2
HSRP for IPv6
59. Which FHRP implementation is a nonproprietary IPv4-only election protocol which has one master router per group?
HSRP for IPv6
GLBP
VRRPv2
VRRPv3
VRRPv2
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?
106
117
114
120
116
116
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?
252
241
255
249
251
251
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?
58
48
50
61
40
48
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?
253
239
249
250
247
249
64. Which FHRP implementation is a nonproprietary IPv4-only election protocol with limited scalability?
VRRPv2
GLBP
GLBP for IPv6
IRDP
VRRPv2
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?
57
44
54
36
46
44
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?
255
252
241
251
249
251
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?
246
252
249
248
238
248
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?
115
114
118
104
112
114