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DHCP (IPv4 and IPv6) →mediumMultiple ChoiceObjective-mapped

DHCPv4 Option 50 (Requested IP Address)

This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 DHCPv4 option is used by a client to request a specific IP address in the DHCPREQUEST message?

Quick Answer

The answer is DHCPv4 Option 50, the Requested IP Address option. This option is included by the client in the DHCPREQUEST message during the selection phase to explicitly specify which IP address it wants to lease, typically the one previously offered by the server. Per RFC 2132, this field allows the client to confirm its desired address, ensuring the server assigns the correct IP, especially in a network with multiple DHCP servers. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of the DHCP DORA process and how clients negotiate addresses; a common trap is confusing Option 50 with Option 54 (Server Identifier), which identifies the target server. Remember, the client requests the IP with Option 50, while Option 54 tells the server who to respond to. For a memory tip, think "50 for the IP I want to drive home"—the client is requesting its specific address, not just any offer.

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

✓

Option 50 (Requested IP Address)

Option B is correct because DHCPv4 Option 50 (Requested IP Address) is specifically used by a client in the DHCPREQUEST message to request a previously offered IP address or to attempt to renew a specific address. This option allows the client to indicate which IP address it wants to use, ensuring the server can confirm or deny the request based on availability and policy.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

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

  • ✗

    Option 12 (Host Name)

    Why it's wrong here

    Option 12 is for host name, not IP address request.

  • ✓

    Option 50 (Requested IP Address)

    Why this is correct

    Option 50 carries the requested IP address in DHCPREQUEST.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Option 54 (Server Identifier)

    Why it's wrong here

    Option 54 identifies the server, not the requested IP.

  • ✗

    Option 51 (IP Address Lease Time)

    Why it's wrong here

    Option 51 specifies lease time, not the requested address.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between Option 50 (Requested IP Address) and Option 54 (Server Identifier), as candidates may confuse the client's request for a specific IP with the server identification used in unicast DHCPREQUEST messages during the selection phase.

Detailed technical explanation

How to think about this question

In the DHCP four-way handshake (DISCOVER, OFFER, REQUEST, ACK), the client uses Option 50 in the DHCPREQUEST message to request a specific IP address from the server, which is critical during the INIT-REBOOT state when the client wants to reuse its previously assigned address. The server checks this option against its lease database and may respond with a DHCPNAK if the address is no longer available or is on a different subnet, preventing address conflicts. This behavior is defined in RFC 2131, where Option 50 is listed as a 'requested IP address' parameter that the client can include to influence the server's allocation decision.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Option 50 (Requested IP Address) — Option B is correct because DHCPv4 Option 50 (Requested IP Address) is specifically used by a client in the DHCPREQUEST message to request a previously offered IP address or to attempt to renew a specific address. This option allows the client to indicate which IP address it wants to use, ensuring the server can confirm or deny the request based on availability and policy.

What should I do if I get this 300-410 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.