The answer is to use the next-hop IP address, as in ip route 0.0.0.0 0.0.0.0 198.51.100.1, because on a multiaccess Ethernet WAN link, specifying only the exit interface forces the router to treat every destination as directly connected, triggering an ARP request for each unknown next hop. By contrast, a next-hop IP allows the router to resolve the gateway via ARP once and forward traffic cleanly, avoiding unnecessary broadcast overhead. On the CCNA 200-301 v2 exam, this tests your understanding of how static default routes behave on different media types—a common trap is assuming an exit interface is always best, but on Ethernet it can cause ARP flooding and high CPU. Remember the memory tip: on Ethernet, point to the neighbor, not the wire.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: a static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.. 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.
A branch router has only one WAN link connected to an Ethernet handoff from the provider. Which static default route is generally the better choice?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ip route 0.0.0.0 0.0.0.0 198.51.100.1
On multiaccess Ethernet, pointing the default route to a next-hop IP address is usually cleaner because the router can resolve the next hop with ARP. Using only the exit interface on Ethernet can make the router treat many destinations as directly connected and trigger unnecessary ARP behavior.
Key principle: A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
Why it's wrong here
That can work, but it is usually less ideal on multiaccess Ethernet.
When this WOULD be correct
In a different scenario where a router has multiple WAN links and the question asks for a static route to be configured for a specific interface, option A could be correct if the interface is indeed the exit point for traffic. For example, if the question specifies routing traffic out of a specific GigabitEthernet interface without a defined next-hop IP.
✓
ip route 0.0.0.0 0.0.0.0 198.51.100.1
Why this is correct
A next-hop address is generally preferred on Ethernet provider handoffs.
Related concept
A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.
✗
ip route 255.255.255.255 255.255.255.255 198.51.100.1
In a scenario where a router needs to direct traffic specifically to a single host IP address (e.g., a management server) rather than a default route, the command 'ip route 255.255.255.255 255.255.255.255 198.51.100.1' would be appropriate for routing traffic intended only for that host.
✗
No static default route should ever be used on Ethernet.
Why it's wrong here
Static defaults are perfectly valid there.
When this WOULD be correct
In a scenario where the question specifies that a router is connected to multiple WAN links, and the requirement is to ensure no static routes are used for redundancy or load balancing, option D could be correct. This would imply that dynamic routing protocols are preferred for managing multiple paths.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
A next-hop address is generally preferred on Ethernet provider handoffs.
✗ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0Wrong answer — click to see why▾
Why this is wrong here
Using an exit interface (GigabitEthernet0/0) without a next-hop address on a multiaccess Ethernet link can cause the router to send ARP requests for every destination IP, leading to high CPU usage and potential ARP table exhaustion. It also prevents the router from using proxy ARP or detecting next-hop failures efficiently.
★ When this WOULD be the correct answer
In a different scenario where a router has multiple WAN links and the question asks for a static route to be configured for a specific interface, option A could be correct if the interface is indeed the exit point for traffic. For example, if the question specifies routing traffic out of a specific GigabitEthernet interface without a defined next-hop IP.
Why candidates choose this
Students often think specifying the exit interface is simpler and sufficient, especially when the router has only one WAN link. They may confuse this with point-to-point links where interface-only static routes are appropriate.
✗ip route 255.255.255.255 255.255.255.255 198.51.100.1Wrong answer — click to see why▾
Why this is wrong here
The command 'ip route 255.255.255.255 255.255.255.255 198.51.100.1' creates a host route for the specific IP 255.255.255.255, not a default route. A default route must have a destination network of 0.0.0.0 with a mask of 0.0.0.0.
★ When this WOULD be the correct answer
In a scenario where a router needs to direct traffic specifically to a single host IP address (e.g., a management server) rather than a default route, the command 'ip route 255.255.255.255 255.255.255.255 198.51.100.1' would be appropriate for routing traffic intended only for that host.
Why candidates choose this
Students might mistakenly think that using all 255s in the destination and mask represents a default route, confusing it with the concept of 'any' or 'all' networks. This is a common misconfiguration due to misunderstanding of IP addressing.
✗No static default route should ever be used on Ethernet.Wrong answer — click to see why▾
Why this is wrong here
Static default routes are perfectly valid and commonly used on Ethernet WAN links, especially in branch offices with a single provider connection. They provide a simple and reliable way to route all unknown traffic to the provider's gateway.
★ When this WOULD be the correct answer
In a scenario where the question specifies that a router is connected to multiple WAN links, and the requirement is to ensure no static routes are used for redundancy or load balancing, option D could be correct. This would imply that dynamic routing protocols are preferred for managing multiple paths.
Why candidates choose this
Some students may believe that dynamic routing protocols are always required on Ethernet links, or they may confuse Ethernet with non-broadcast multiaccess (NBMA) networks where static routes can be problematic. This option is an overgeneralization.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common exam trap is selecting a static default route that specifies only the exit Ethernet interface without a next-hop IP address. While this configuration can work, it causes the router to treat all unknown destinations as directly connected on the Ethernet segment. This behavior triggers excessive ARP requests for every unknown IP address, leading to network inefficiency and potential delays. Candidates might incorrectly assume that specifying the interface alone is sufficient, but on multiaccess Ethernet links, this is suboptimal and can cause routing issues.
Detailed technical explanation
How to think about this question
A static default route is a routing entry that matches all destination IP addresses not found in the routing table, typically configured as 0.0.0.0/0. It directs packets destined for unknown networks to a specified next-hop IP address or exit interface. In Cisco IOS, static routes can be configured with either a next-hop IP address or an exit interface. The choice impacts how the router resolves Layer 2 forwarding and handles ARP requests, especially on multiaccess Ethernet links.
When a static default route is configured on an Ethernet interface, specifying the next-hop IP address is preferred. This is because Ethernet is a multiaccess broadcast medium where the router must resolve the MAC address of the next-hop IP using ARP. If only the exit interface is specified without a next-hop IP, the router assumes all unknown destinations are directly connected on that Ethernet segment. This assumption causes the router to send ARP requests for every unknown destination IP, leading to unnecessary ARP traffic and potential delays.
The exam trap lies in choosing the static default route with only the exit interface on Ethernet, which might seem simpler but causes inefficient ARP behavior. The correct approach is to specify the next-hop IP address provided by the ISP, allowing the router to ARP once for the next hop and forward all unknown traffic efficiently. This behavior is specific to multiaccess Ethernet links and differs from point-to-point serial links where specifying only the exit interface is acceptable and common.
KKey Concepts to Remember
A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.
On multiaccess Ethernet links, Cisco routers prefer static default routes that specify a next-hop IP address rather than just an exit interface.
Using a next-hop IP address in a static default route allows the router to resolve the next hop via ARP, ensuring proper Layer 2 forwarding.
Specifying only an exit interface on Ethernet can cause the router to treat all destinations as directly connected, leading to excessive ARP requests.
A static default route with a next-hop IP address is more scalable and reliable on Ethernet WAN links provided by ISPs.
Host routes (e.g., 255.255.255.255/32) are not suitable as default routes because they only match a single IP address, not all unknown destinations.
Static default routes are valid and commonly used on Ethernet interfaces, contrary to the misconception that they should be avoided.
Cisco routers use the administrative distance and routing table rules to prefer static routes with next-hop IPs over those with only exit interfaces on multiaccess links.
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
A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review a static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions..
What is the correct answer to this question?
The correct answer is: ip route 0.0.0.0 0.0.0.0 198.51.100.1 — On multiaccess Ethernet, pointing the default route to a next-hop IP address is usually cleaner because the router can resolve the next hop with ARP. Using only the exit interface on Ethernet can make the router treat many destinations as directly connected and trigger unnecessary ARP behavior.
What should I do if I get this 200-301 question wrong?
Review a static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A static default route directs all unknown destination traffic to a specified next-hop IP address or exit interface to simplify routing decisions.
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