Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
What is the primary purpose of a DHCP default gateway option provided to a host?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
To identify the next-hop router or Layer 3 device for off-subnet traffic
This is correct because the default gateway tells the host where to send traffic destined for remote networks.
B
Distractor review
To replace the host MAC address permanently
This is wrong because the default gateway option does not change or replace the host MAC address.
C
Distractor review
To choose the STP root bridge
This is wrong because STP root bridge election is unrelated to DHCP host gateway settings.
D
Distractor review
To define the NAT pool for the edge router
This is wrong because a host’s default gateway option is not a NAT pool configuration item.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is selecting options related to unrelated networking functions like STP root bridge election or NAT pool configuration when asked about the DHCP default gateway option. Candidates may mistakenly think DHCP configures MAC addresses or influences Layer 2 protocols, but DHCP’s default gateway option solely provides the IP address of the router interface that forwards traffic off the local subnet. Confusing these concepts leads to incorrect answers because the default gateway option does not alter MAC addresses, participate in STP decisions, or define NAT pools. Recognizing the specific role of the DHCP default gateway option prevents this common mistake.
Technical deep dive
How to think about this question
The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the process of configuring devices on IP networks. One critical piece of information DHCP provides to hosts is the default gateway address, which is the IP address of the router interface that connects the local subnet to other networks. This default gateway acts as the next-hop Layer 3 device for any traffic destined outside the host's local subnet, enabling communication beyond the local broadcast domain. When a host receives its IP configuration via DHCP, the default gateway option (option 3 in DHCP) tells the host where to send packets that are not on the local subnet. The host uses this gateway IP address to forward off-subnet traffic to the router, which then routes the packets toward their final destination. Without this default gateway information, the host can only communicate with devices on the same subnet and cannot reach remote networks, which is essential for normal network operation and internet access. A common exam trap is confusing the DHCP default gateway option with other unrelated functions such as MAC address assignment, Spanning Tree Protocol (STP) root bridge election, or NAT pool definitions. The default gateway option strictly informs the host about the next-hop router for off-subnet traffic and does not influence Layer 2 addressing or routing protocol operations. Understanding this distinction is crucial for correctly answering questions about DHCP and IP services in the CCNA exam.
KKey Concepts to Remember
- DHCP provides hosts with IP configuration parameters including IP address, subnet mask, and default gateway to enable network communication.
- The DHCP default gateway option specifies the IP address of the router interface that forwards traffic destined for remote networks.
- Hosts use the default gateway IP address to send packets outside their local subnet to the next-hop Layer 3 device for routing.
- Without a configured default gateway, hosts can communicate only within their local subnet and cannot reach external networks.
- The DHCP default gateway option does not modify the host's MAC address or participate in Layer 2 protocols like STP.
- STP root bridge election is unrelated to DHCP and does not depend on any DHCP options provided to hosts.
- NAT pool definitions are configured on routers and are not delivered to hosts via DHCP default gateway options.
- Understanding the specific role of DHCP options helps avoid confusing routing information with unrelated network functions.
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
DHCP provides hosts with IP configuration parameters including IP address, subnet mask, and default gateway to enable network communication.
What is the correct answer to this question?
The correct answer is: To identify the next-hop router or Layer 3 device for off-subnet traffic — The default gateway option tells the host where to send traffic destined for other IP networks. In plain language, the host needs to know which local router or Layer 3 interface can forward packets off the subnet. Without that gateway information, the host may still communicate with local devices on its own subnet, but it will struggle to reach remote networks unless the gateway is configured manually. This is one of the key reasons DHCP is so useful: it can deliver not just an IP address, but also the supporting information a host needs to function normally in a routed environment.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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