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January 7th, 2021 Go to comments
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Note: If you are not sure about DHCP, please read our . DHCP tutorial Question 1
Which Cisco IOS command will indicate that interface GigabitEthernet 0/0 is configured via DHCP?
A. show ip interface GigabitEthernet 0/0 dhcp
B. show interface GigabitEthernet 0/0 C. show ip interface dhcp
D. show ip interface GigabitEthernet 0/0
E. show ip interface GigabitEthernet 0/0 brief Answer: D Question 2
Which command enables a router to become a DHCP client? A. ip address dhcp B. ip helper-address C. ip dhcp pool D. ip dhcp client Answer: A Explanation
If we want to get an IP address from the DHCP server on a Cisco device, we can use the command “ip address dhcp”.
Note: The command “ip helper-address” enables a router to become a DHCP Relay Agent. Question 3
What are two roles of the Dynamic Host Configuration Protocol (DHCP)? (Choose two)
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CCNA Training » DHCP Questions
A. The DHCP server offers the ability to exclude specific IP addresses from a pool of IP addresses
B. The DHCP client can request up to four DNS server addresses
C. The DHCP server assigns IP addresses without requiring the client to renew them
D. The DHCP server leases client IP addresses dynamically
E. The DHCP client maintains a pool of IP addresses it can assign Answer: A D Question 4
Refer to the exhibit. An engineer deploys a topology in which R1 obtains its IP configuration from DHCP. If the
switch and DHCP server configurations are complete and correct. Which two sets of commands must be
configured on R1 and R2 to complete the task? (Choose two)
A. R1 (config)# interface fa0/0
R1 (config-if)# ip helper-address 198.51.100.100
B. R2(config)# interface gi0/0
R2(config-if)# ip helper-address 198.51.100.100
C. R1 (config)# interface fa0/0
R1 (config-if)# ip address dhcp R1 (config-if)# no shutdown
D. R2(config)# interface gi0/0 R2(config-if)# ip address dhcp
E. R1 (config)# interface fa0/0
R1 (config-if)# ip helper-address 192.0.2.2 Answer: B C Question 5
Refer to the exhibit. If the network environment is operating normally, which type of device must be connected to interface FastEthernet 0/1? ip arp inspection vlan 2-10 interface fastethernet 0/1 ip arp inspection trust A. DHCP client B. access point C. router D. PC
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CCNA Training » DHCP Questions Answer: C Explanation
To configure DHCP snooping feature, at least three steps must be done: Sequence and Description Command
1. Configure global DHCP snooping
Switch(config)# ip dhcp snooping
2. Configure trusted ports (as least on 1 port).
Switch(config-if)# ip dhcp snooping trust
By default, all ports are untrusted
3. Configure DHCP snooping for the selected
Switch(config)# ip dhcp snooping vlan {VLAN-ID | VLAN VLANs range}
Note: To configure DHCP snooping with Dynamic ARP Inspection we need to add the command “ip arp
inspection vlan vlan-id” in global configuration mode and “ip arp inspection trust” in interface mode.
In a normal network environment, we should trust interfaces that are connected to routers, not end points. Question 6
Which type of information resides on a DHCP server?
A. a list of the available IP addresses in a pool
B. a list of public IP addresses and their corresponding names
C. usernames and passwords for the end users in a domain
D. a list of statically assigned MAC addresses Answer: A Question 7 What is a DHCP client?
A. a host that is configured to request an IP address automatically
B. a router that statically assigns IP addresses to hosts
C. a server that dynamically assigns IP addresses to hosts
D. a workstation that requests a domain name associated with its IP address Answer: A Question 8
Where does the configuration reside when a helper address is configured to support DHCP?
A. on the switch trunk interface.
B. on the router closest to the client.
C. on the router closest to the server.
D. on every router along the path.
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CCNA Training » DHCP Questions Answer: B Question 9
When implementing a router as a DHCP server, which two features must be configured? (Choose two) A. relay agent information B. database agent C. address pool D. smart-relay E. manual bindings Answer: C E Explanation
The following example shows how to configure a DHCP Server on a Cisco router: Configuration Description
Router(config)#ip dhcp Create a DHCP Pool named CLIENTS pool CLIENTS Router(dhcp- config)#network
Specifies the subnet and mask of the DHCP address pool 10.1.1.0 /24 Router(dhcp- config)#default-router
Set the default gateway of the DHCP Clients 10.1.1.1 Router(dhcp- config)#dns-server
Configure a Domain Name Server (DNS) 10.1.1.1 Router(dhcp- config)#domain-name Configure a domain-name 9tut.com
Duration of the lease (the time during which a client computer can use an assigned IP address). The syntax is “
{days[hours] [minutes] | infinite}”. In this case the lease Router(dhcp-
lease is 12 hours. The default is a one-day lease. config)#lease 0 12
Before the lease expires, the client typically needs to renew its address lease assignment with the server Router(dhcp- config)#exit Router(config)# ip
The IP range that a DHCP Server should not assign to DHCP Clients. Notice this
dhcp excluded-address command is configured under global configuration mode 10.1.1.1 10.1.1.10
Manual bindings are IP addresses that have been manually mapped to the MAC addresses of hosts that are found in the DHCP database.
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CCNA Training » DHCP Questions
All DHCP clients send a client identifier (DHCP option 61) in the DHCP packet. To configure manual bindings,
you must enter the client-identifier DHCP pool configuration command with the appropriate hexadecimal
values identifying the DHCP client. For example: ip dhcp pool SERVER
host 172.16.200.100 255.255.255.0
client-identifier 01aa.bbcc.0003.00 default-router 172.16.200.1 !
Therefore two requirements for DHCP binding is the IP address and the hardware address (MAC address) of the
client. Notice that in the above example “aabb.cc00.0300” is the MAC address of the client while prefix “01”
represents the Ethernet media type.
Note: In fact, this question should ask “When implementing a router as a DHCP server, which one of these
features must be configured?”. Because we only need to configure either an “address pool” or “manual binding”. Question 10
Which command must you enter to configure a DHCP relay? A. ip helper-address B. ip address dhcp C. ip dhcp relay D. ip dhcp pool Answer: A Explanation
If the DHCP Server is not on the same subnet with the DHCP Client, we need to configure the router on the
DHCP client side to act as a DHCP Relay Agent so that it can forward DHCP messages between the DHCP
Client & DHCP Server. To make a router a DHCP Relay Agent, simply put the “ip helper-address of-DHCP-Server>” command under the interface that receives the DHCP messages from the DHCP Client.
As we know, router does not forward broadcast packets (it drops them instead) so DHCP messages like
DHCPDISCOVER message will be dropped. But with the “ip helper-address …” command, the router will
accept that broadcast message and cover it into a unicast packet and forward it to the DHCP Server. The
destination IP address of the unicast packet is taken from the “ip helper-address …” command. Question 11
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CCNA Training » DHCP Questions
Where does a switch maintain DHCP snooping information? A. in the CAM table B. in the VLAN database
C. in the DHCP binding database D. in the MAC address table Answer: C Comments (4) Comments 1. yucare January 17th, 2021
Q4 answers in DHCP section is right BnC where in quiz it comes out wrong? Can someone explain this plz. 2. MoG January 28th, 2021
@yucare: The commands in Answere B do configure the interface on R2 to forward DHCP requests on
the behalf of the actual dhcp Server. Hence working as Man-in-the-Middle for DHCP operation.
The Commands in Answere C do 1st configures R1’s interface faceing towards R2 to make use of DHCP
for configuration, aswell as negating the shutdown command applied to all router-ports by default 3. Otabek April 17th, 2021
If you have any questions from Cisco, please leave them to me telegram link Otabek3633 4. Nena July 9th, 2021
hi, is there same the questions and answer in premium membership? Add a Comment Name
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