This 200-301 practice question tests your understanding of ip routing. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: a default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.. 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.
Why is a default route often called a route of last resort?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Because it is used only when no more specific route matches the destination.
Option A correctly identifies the default route as a route of last resort because it is used only when no more specific route matches the destination. Option B is incorrect because bandwidth is not a defining characteristic of a default route; it is simply a fallback path. Option C is wrong because default routes can be configured statically or learned via any routing protocol (e.g., OSPF, EIGRP, RIP), not exclusively OSPF. Option D is false because the default route is the least specific route (0.0.0.0/0), not more specific than any other route.
Key principle: A default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Because it is used only when no more specific route matches the destination.
Why this is correct
This is correct because the default route is a fallback path.
Related concept
A default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.
✗
Because it always has the lowest bandwidth.
Why it's wrong here
This is wrong because the default route is not defined by bandwidth.
When this WOULD be correct
In a different question, if asked about the characteristics of routing protocols or how to optimize network performance, an option stating that a default route has the lowest bandwidth could be correct if it specifically refers to a scenario where it is intentionally configured to limit traffic flow.
✗
Because it must be learned from OSPF only.
Why it's wrong here
This is wrong because default routes can come from several sources, including static configuration.
When this WOULD be correct
If the exam question specified that a default route must be configured in an OSPF environment and that OSPF is the only routing protocol in use, then this option would be correct. For example, a question could ask about the requirements for a default route in a purely OSPF network.
✗
Because it is more specific than every other route.
Why it's wrong here
This is wrong because the default route is the least specific route.
When this WOULD be correct
This option would be correct in a question asking for the characteristics of a specific type of route that is more specific than all others, such as a static route with a defined subnet mask that matches a particular destination more closely than any default route.
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.
✓Because it is used only when no more specific route matches the destination.Correct answer▾
Why this is correct
This is correct because the default route is a fallback path.
✗Because it always has the lowest bandwidth.Wrong answer — click to see why▾
Why this is wrong here
The default route is not defined by bandwidth; it is a routing entry with the prefix 0.0.0.0/0 that matches all destinations. Bandwidth is a metric used by routing protocols like EIGRP, but it does not determine whether a route is a default route.
★ When this WOULD be the correct answer
In a different question, if asked about the characteristics of routing protocols or how to optimize network performance, an option stating that a default route has the lowest bandwidth could be correct if it specifically refers to a scenario where it is intentionally configured to limit traffic flow.
Why candidates choose this
Students might confuse the concept of a default route with a route that has a low metric or cost, thinking that 'last resort' implies a poor-quality path. However, the term 'last resort' refers to the order of matching, not the quality of the route.
✗Because it must be learned from OSPF only.Wrong answer — click to see why▾
Why this is wrong here
Default routes can be learned from multiple sources, including static configuration, OSPF, EIGRP, RIP, and other routing protocols. OSPF is just one possible source, and it is not mandatory for learning a default route.
★ When this WOULD be the correct answer
If the exam question specified that a default route must be configured in an OSPF environment and that OSPF is the only routing protocol in use, then this option would be correct. For example, a question could ask about the requirements for a default route in a purely OSPF network.
Why candidates choose this
Students may recall that OSPF can generate a default route using the 'default-information originate' command, leading them to incorrectly assume that OSPF is the only source. However, default routes are commonly configured statically or learned via other protocols.
✗Because it is more specific than every other route.Wrong answer — click to see why▾
Why this is wrong here
The default route (0.0.0.0/0) is the least specific route because it has a prefix length of 0, meaning it matches all IP addresses. More specific routes have longer prefix lengths (e.g., /24, /16) and are preferred over the default route.
★ When this WOULD be the correct answer
This option would be correct in a question asking for the characteristics of a specific type of route that is more specific than all others, such as a static route with a defined subnet mask that matches a particular destination more closely than any default route.
Why candidates choose this
The phrase 'route of last resort' might be misinterpreted as meaning the route is more specific or important, but in routing, 'last resort' means it is used only when no other route matches, which is the opposite of being more specific.
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 the default route is learned only via OSPF or that it always has the lowest bandwidth, when in fact it is simply the least specific route used as a fallback.
Detailed technical explanation
How to think about this question
A default route in IP routing is a special route used by routers to forward packets when no other more specific route matches the destination IP address. It acts as a catch-all path, directing traffic to a next-hop router or exit interface when the routing table lacks a precise match. This behavior is essential for efficient routing, especially in large or dynamic networks where maintaining exhaustive routing entries for every possible destination is impractical.
Routers use a longest prefix match algorithm to determine the best route for a packet. When no route with a more specific subnet mask matches the destination, the router resorts to the default route, often represented as 0.0.0.0/0 in IPv4. This route is considered the "route of last resort" because it is only used after all other routes have been evaluated and found unsuitable. Cisco routers prefer connected and static routes with longer prefixes over the default route, ensuring that the default route is truly a fallback.
A common exam trap is misunderstanding the specificity of routes. Some candidates incorrectly assume the default route is more specific or tied to certain routing protocols like OSPF. In reality, the default route is the least specific and can be configured statically or learned dynamically via multiple protocols. Practically, the default route simplifies routing tables and reduces overhead by providing a single path for unknown destinations, but it should be used carefully to avoid routing loops or blackholing traffic.
KKey Concepts to Remember
A default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.
Routers use longest prefix match to select routes, causing the default route to be chosen only if no other route with a longer prefix exists.
The default route is commonly represented as 0.0.0.0/0 in IPv4 routing tables and acts as a fallback path for unknown destinations.
Cisco routers prefer connected, static, or dynamic routes with more specific prefixes over the default route during route selection.
Default routes can be configured statically or learned dynamically via routing protocols such as OSPF, EIGRP, or RIP.
The term 'route of last resort' emphasizes the default route’s role as the final option when no other route applies.
Misunderstanding the default route’s specificity or protocol dependency is a common exam mistake.
Using a default route reduces routing table size and complexity by providing a single path for all unmatched traffic.
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 default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.
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 a default route is installed in the routing table to forward packets when no more specific route matches the destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — A default route is installed in the routing table to forward packets when no more specific route matches the destination IP address..
What is the correct answer to this question?
The correct answer is: Because it is used only when no more specific route matches the destination. — Option A correctly identifies the default route as a route of last resort because it is used only when no more specific route matches the destination. Option B is incorrect because bandwidth is not a defining characteristic of a default route; it is simply a fallback path. Option C is wrong because default routes can be configured statically or learned via any routing protocol (e.g., OSPF, EIGRP, RIP), not exclusively OSPF. Option D is false because the default route is the least specific route (0.0.0.0/0), not more specific than any other route.
What should I do if I get this 200-301 question wrong?
Review a default route is installed in the routing table to forward packets when no more specific route matches the destination IP address., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A default route is installed in the routing table to forward packets when no more specific route matches the destination IP address.
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