Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
Which two statements accurately describe the role of a default gateway on an IPv4 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
It is the next-hop path used for destinations outside the local subnet.
This is correct because that is the core purpose of a default gateway.
B
Best answer
It is typically an IP address on the same local subnet as the host.
This is correct because the host must be able to reach the gateway directly at Layer 2.
C
Distractor review
It replaces the need for a subnet mask.
This is wrong because the host still needs the subnet mask to identify local versus remote destinations.
D
Distractor review
It is the same thing as a DNS server.
This is wrong because DNS and default gateway are different services with different purposes.
E
Distractor review
It is used only for broadcast traffic.
This is wrong because the gateway is used for off-subnet unicast forwarding, not only broadcast.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking the default gateway for a DNS server or assuming it replaces the subnet mask. Candidates may incorrectly believe the gateway handles name resolution or subnetting functions, which it does not. The default gateway strictly forwards packets to remote networks and must be reachable on the local subnet. Misunderstanding this leads to incorrect configurations and routing failures, causing hosts to be unable to communicate outside their subnet. Recognizing that the gateway is a Layer 3 next-hop device, not a service like DNS, is essential to avoid this pitfall.
Technical deep dive
How to think about this question
A default gateway on an IPv4 host is a crucial network configuration element that enables communication beyond the local subnet. It is typically the IP address of a router interface on the same subnet as the host, serving as the next-hop device for packets destined for remote networks. When a host determines that a destination IP address is outside its local subnet based on its IP address and subnet mask, it forwards the packet to the default gateway for routing. The decision process for using a default gateway involves the host first applying its subnet mask to the destination IP address to check if the destination is local or remote. If the destination is local, the host sends the packet directly using Layer 2 addressing. If remote, the host sends the packet to the default gateway’s IP address, which must be reachable on the same Layer 2 network segment. This ensures proper routing of off-subnet traffic through the gateway device. A common exam trap is confusing the default gateway with other network services like DNS or assuming it replaces the subnet mask. The default gateway does not perform name resolution nor does it define subnet boundaries. It only acts as the forwarding path for traffic destined outside the local subnet. Understanding this distinction is critical for correctly configuring and troubleshooting IP routing in Cisco networks.
KKey Concepts to Remember
- A default gateway provides the next-hop IP address for packets destined outside the host’s local subnet.
- The default gateway IP address must reside on the same local subnet as the host to be reachable at Layer 2.
- Hosts use their subnet mask to determine whether a destination IP address is local or remote before sending to the gateway.
- The default gateway does not replace the need for a subnet mask in IP address configuration and routing decisions.
- A default gateway is distinct from a DNS server, which resolves domain names to IP addresses.
- Traffic destined for remote networks is forwarded to the default gateway for routing beyond the local Layer 2 domain.
- If the default gateway is unreachable, the host cannot communicate with devices outside its local subnet.
- Configuring an incorrect default gateway IP address can cause loss of connectivity to external networks.
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?
A default gateway provides the next-hop IP address for packets destined outside the host’s local subnet.
What is the correct answer to this question?
The correct answer is: It is the next-hop path used for destinations outside the local subnet. — A default gateway gives the host a next hop for traffic that is not destined for the local subnet. In plain language, it is the local router or Layer 3 interface the host uses when the destination is somewhere else. The host still needs its IP address and subnet mask to decide what is local, but once it decides something is remote, the default gateway becomes the path out. The most common mistake is treating the default gateway like a DNS server or assuming it replaces the subnet mask. It does not. The two correct answers are the ones focused on off-subnet forwarding and the fact that the gateway must be reachable on the host’s own local network.
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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