Question 206 of 2,015

NAT and DHCP →easyMultiple SelectObjective-mapped

CCNP NAT and DHCP Practice Question

This 350-401 practice question tests your understanding of nat and dhcp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Which two statements about DHCP client configuration on a Cisco router are true? (Choose two.)

Question 1easymulti select

Read the full DHCP explanation →

A
The ip address dhcp command on an interface enables the router to obtain an IP address from a DHCP server.
Correct because this command configures the interface as a DHCP client to request an address.
B
The router will automatically install a default route if the DHCP server provides the default gateway option.
Correct because the DHCP client on Cisco routers installs a default route with the gateway provided in the DHCP offer.
C
The ip helper-address command is used to configure the router as a DHCP client on an interface.
Why wrong: Incorrect because ip helper-address is used to forward UDP broadcasts (including DHCP) to a server, not to obtain an address.
D
The router can be configured to request a specific IP address using the dhcp client request ip-address command.
Why wrong: Incorrect because there is no such command; the router can request options but not a specific IP address; the server assigns it.
E
The dhcp client hostname command allows the router to send a hostname option in the DHCP discover message.
Why wrong: Incorrect because this command is valid on some platforms but is not a standard IOS command; the correct command is 'ip dhcp client hostname'.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The ip address dhcp command on an interface enables the router to obtain an IP address from a DHCP server.

A Cisco router interface can obtain an IP address via DHCP using the ip address dhcp command. The router can also request a specific hostname using the dhcp client hostname command. The default route is automatically installed if the DHCP server provides a default gateway option. The ip helper-address command is used to forward DHCP broadcasts, not to obtain an address. The ip dhcp client request command can be used to request specific options, but the default route is installed automatically.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The ip address dhcp command on an interface enables the router to obtain an IP address from a DHCP server.
Why this is correct
Correct because this command configures the interface as a DHCP client to request an address.
Related concept
CIDR notation defines the prefix length.
✓
The router will automatically install a default route if the DHCP server provides the default gateway option.
Why this is correct
Correct because the DHCP client on Cisco routers installs a default route with the gateway provided in the DHCP offer.
Related concept
CIDR notation defines the prefix length.
✗
The ip helper-address command is used to configure the router as a DHCP client on an interface.
Why it's wrong here
Incorrect because ip helper-address is used to forward UDP broadcasts (including DHCP) to a server, not to obtain an address.
✗
The router can be configured to request a specific IP address using the dhcp client request ip-address command.
Why it's wrong here
Incorrect because there is no such command; the router can request options but not a specific IP address; the server assigns it.
✗
The dhcp client hostname command allows the router to send a hostname option in the DHCP discover message.
Why it's wrong here
Incorrect because this command is valid on some platforms but is not a standard IOS command; the correct command is 'ip dhcp client hostname'.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Trap categories for this question

Command / output trap
Incorrect because there is no such command; the router can request options but not a specific IP address; the server assigns it.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Real-world example

How this comes up in practice

A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-401 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this 350-401 question test?

NAT and DHCP — This question tests NAT and DHCP — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The ip address dhcp command on an interface enables the router to obtain an IP address from a DHCP server. — A Cisco router interface can obtain an IP address via DHCP using the ip address dhcp command. The router can also request a specific hostname using the dhcp client hostname command. The default route is automatically installed if the DHCP server provides a default gateway option. The ip helper-address command is used to forward DHCP broadcasts, not to obtain an address. The ip dhcp client request command can be used to request specific options, but the default route is installed automatically.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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