The correct answer is that the static default route with administrative distance 250 serves as a backup default route if the OSPF default is lost. This design works because OSPF’s default administrative distance is 110, which is far lower than 250, so the OSPF route is always preferred while it exists. The static route remains in the routing table as a candidate but is never installed as active unless the OSPF route disappears, making it a floating static default route that provides resilience without replacing the primary dynamic path. On the CCNA 200-301 v2 exam, this scenario tests your understanding of administrative distance as a tiebreaker and the concept of a floating static route for redundancy. A common trap is assuming a lower AD is always better for backup; in reality, you want the backup to have a very high AD so it only activates on failure. Memory tip: think of it as a “last resort lifeguard” — it stays on the beach (inactive) until the primary swimmer (OSPF) goes under.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.. 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 router has a static default route with administrative distance 250 and also learns a default route through OSPF. What is the main design purpose of the static default route?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To serve as a backup default route if the OSPF default is lost.
The main purpose is to act as a backup route of last resort if the OSPF-learned default route disappears. In practical terms, the very high administrative distance keeps the static default out of the active table while the OSPF default is available. It remains in reserve only for failure conditions.
This is a classic floating-static-default design. It provides resilience without replacing the primary dynamic path.
Key principle: Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
To serve as a backup default route if the OSPF default is lost.
Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.
✗
To override the OSPF default route immediately.
Why it's wrong here
This is wrong because the high distance does the opposite.
When this WOULD be correct
In a different scenario where a static default route has an administrative distance lower than that of OSPF, a question might ask about the purpose of the static route in a network where immediate route preference is required. In that case, the static route would indeed override the OSPF default route.
✗
To make the router ignore all default routes.
Why it's wrong here
This is wrong because the static default still exists as a backup.
When this WOULD be correct
In a different question scenario where a router is configured to ignore all dynamic routes and only use static routes, a static default route with an administrative distance of 250 could be used to signify that no default routes should be accepted, effectively ignoring them.
In a question where the context involves configuring a router to explicitly define a route to a specific host IP address, a static route could be described as turning a default route into a host route if the default route is redefined to point to a specific host rather than a network.
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.
✓To serve as a backup default route if the OSPF default is lost.Correct answer▾
Why this is correct
This is correct because the high administrative distance makes it a standby route.
✗To override the OSPF default route immediately.Wrong answer — click to see why▾
Why this is wrong here
A static default route with administrative distance 250 has a higher (less preferred) distance than OSPF (default AD 110), so it will not override the OSPF route. The OSPF route remains in the routing table as long as it is valid.
★ When this WOULD be the correct answer
In a different scenario where a static default route has an administrative distance lower than that of OSPF, a question might ask about the purpose of the static route in a network where immediate route preference is required. In that case, the static route would indeed override the OSPF default route.
Why candidates choose this
Students may confuse administrative distance with metric or assume that a static route always takes precedence over dynamic routes, forgetting that a higher AD means lower preference.
✗To make the router ignore all default routes.Wrong answer — click to see why▾
Why this is wrong here
The router does not ignore all default routes; it still uses the OSPF-learned default route (AD 110) as the primary path. The static default route is simply not installed in the routing table while the OSPF route exists.
★ When this WOULD be the correct answer
In a different question scenario where a router is configured to ignore all dynamic routes and only use static routes, a static default route with an administrative distance of 250 could be used to signify that no default routes should be accepted, effectively ignoring them.
Why candidates choose this
A test-taker might think that a high AD causes the route to be ignored entirely, but in reality, the route is present in the configuration and becomes active only when the preferred route is removed.
✗To turn the default route into a host route.Wrong answer — click to see why▾
Why this is wrong here
Administrative distance does not affect the prefix length or type of route; it only influences route preference. A default route (0.0.0.0/0) remains a default route regardless of its AD.
★ When this WOULD be the correct answer
In a question where the context involves configuring a router to explicitly define a route to a specific host IP address, a static route could be described as turning a default route into a host route if the default route is redefined to point to a specific host rather than a network.
Why candidates choose this
Some students may mistakenly believe that changing AD can alter the subnet mask or convert a network route into a host route, which is incorrect.
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 assuming that a static default route with a high administrative distance will override the OSPF default route immediately. Candidates might think the static route takes precedence because it is manually configured, but in reality, the administrative distance value controls route preference. Since 250 is much higher than OSPF’s 110, the static route remains inactive while OSPF’s route is available. This misunderstanding can lead to incorrect answers about route selection and failover behavior in Cisco routing exams.
Detailed technical explanation
How to think about this question
Static default routes with a high administrative distance are commonly used as floating static routes in Cisco routing environments. The administrative distance (AD) is a value that routers use to select the best path when multiple routes to the same destination exist from different routing protocols or sources. A static route with an AD of 250 is intentionally set higher than most dynamic routing protocols, such as OSPF, which has an AD of 110 by default. This means the router prefers the OSPF-learned default route over the static one under normal conditions.
When a router learns a default route via OSPF, it installs that route into the routing table because OSPF’s AD is lower and thus more trusted. The static default route with AD 250 remains in the routing table only as a backup and does not interfere with the OSPF route. If the OSPF default route disappears due to a link failure or OSPF adjacency loss, the router then falls back to the static default route, ensuring continued connectivity to a default gateway without manual intervention.
This design pattern is known as a floating static route and is a practical method to provide redundancy without disrupting the primary dynamic routing path. A common exam trap is misunderstanding the role of administrative distance; some may incorrectly assume the static route overrides OSPF immediately, but the high AD prevents this. In real networks, this approach provides resilience by automatically switching to the static route only when the OSPF route is unavailable, maintaining stable routing behavior.
KKey Concepts to Remember
Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.
OSPF default routes have an administrative distance of 110 by default, making them more preferred than static routes with higher AD values.
A static default route configured with an administrative distance of 250 acts as a floating static route, serving as a backup route.
Floating static routes remain inactive in the routing table while a better route exists but become active if the preferred route disappears.
Routers use the administrative distance to decide which default route to install in the routing table when multiple default routes exist.
A static default route with a high administrative distance does not override dynamic routing protocols but provides failover capability.
The presence of a floating static route improves network resilience by ensuring a default route is always available even if dynamic routing fails.
Misinterpreting administrative distance can lead to incorrect assumptions about route selection and failover behavior in routing protocols.
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
Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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 administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones..
What is the correct answer to this question?
The correct answer is: To serve as a backup default route if the OSPF default is lost. — The main purpose is to act as a backup route of last resort if the OSPF-learned default route disappears. In practical terms, the very high administrative distance keeps the static default out of the active table while the OSPF default is available. It remains in reserve only for failure conditions.
This is a classic floating-static-default design. It provides resilience without replacing the primary dynamic path.
What should I do if I get this 200-301 question wrong?
Review administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Administrative distance determines the trustworthiness of routes learned from different sources, with lower values preferred over higher ones.
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A static default route is configured with an administrative distance of 250. What is the most likely design intention?
hard
✓ A.To keep the route as a backup of last resort behind normal learned routes
B.To make the route override all dynamic routing immediately
C.To disable default routing entirely
D.To convert the default route into a host route
Why A: The design intention is to make the static default route a very low-priority backup path. In plain language, the administrator wants the route to exist only as a last resort behind almost any normal learned path. By assigning such a high administrative distance, the route stays out of the active table unless better routes disappear.
This is a floating-static design concept. The route is not meant to be primary. It is intentionally configured to sit in reserve and become relevant only during failure conditions or severe loss of normal routing information.
Variation 2. An engineer configures a floating static route to 0.0.0.0/0 with an administrative distance of 200 while OSPF is providing a default route. What is the intended behavior?
hard
✓ A.The static default route acts as a backup and becomes active only if the OSPF default route is lost.
B.The static default route overrides OSPF immediately because it is manually configured.
C.Both default routes must always load-balance together.
D.The router ignores both defaults because they overlap.
Why A: The intended behavior is that the static default route stays in reserve and becomes active only if the OSPF-learned default route disappears. In plain language, the administrator wants a backup path, not a replacement for the normal OSPF path. By assigning the static route a higher administrative distance than OSPF, the router treats it as less trustworthy during normal operation.
This is a standard floating-static design. The static route is still configured, but it does not normally appear as the preferred forwarding choice until the lower-distance route is lost. That is the key operational purpose of the configuration.
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