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: equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.. 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.
Which statement best describes equal-cost multipath behavior in routing?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router may install multiple equally good routes to the same destination and use them for forwarding
Equal-cost multipath allows a router to use more than one path to the same destination when those paths are considered equally good by the routing logic. In plain language, if the router sees multiple valid routes with the same cost or equivalent preference, it may install more than one and share traffic across them. This can improve redundancy and load distribution without requiring one path to sit idle.
This concept is important because learners often assume the router must always choose only one path. In reality, many routing environments support multiple equal paths simultaneously. The correct answer is the one that captures this multi-path forwarding behavior.
Key principle: Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The router may install multiple equally good routes to the same destination and use them for forwarding
Why this is correct
This is correct because equal-cost multipath allows use of more than one equivalent route.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.
✗
The router always discards all but the first route learned
Why it's wrong here
This is wrong because many routing platforms support equal-cost multipath.
When this WOULD be correct
In a question asking about a routing protocol that only supports a single route to a destination, such as a basic static routing scenario, option B could be correct. The question might specify that the router is configured to prioritize one route over others, leading to the discarding of any additional routes.
✗
Equal-cost multipath means every route source is trusted equally
Why it's wrong here
This is wrong because route-source trust is a separate administrative-distance concept.
When this WOULD be correct
In a question asking about route source trust in a network security context, where it states that multiple routing sources are treated with equal trust, this option could be correct. For example, a question might ask about scenarios in a network where all routing information is considered equally valid regardless of the source.
✗
Equal-cost multipath works only when no routing table exists
Why it's wrong here
This is wrong because ECMP is a routing-table behavior, not the absence of one.
When this WOULD be correct
In a different question asking about routing behavior when no routes are available in the routing table, stating that equal-cost multipath works only when no routing table exists could be correct if the context is about a theoretical scenario where routing decisions cannot be made due to a lack of available routes.
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.
✓The router may install multiple equally good routes to the same destination and use them for forwardingCorrect answer▾
Why this is correct
This is correct because equal-cost multipath allows use of more than one equivalent route.
✗The router always discards all but the first route learnedWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because equal-cost multipath (ECMP) allows routers to install and utilize multiple routes to the same destination, rather than discarding all but the first route. Discarding routes contradicts the fundamental principle of ECMP.
★ When this WOULD be the correct answer
In a question asking about a routing protocol that only supports a single route to a destination, such as a basic static routing scenario, option B could be correct. The question might specify that the router is configured to prioritize one route over others, leading to the discarding of any additional routes.
Why candidates choose this
Candidates may find this option tempting because it aligns with the common behavior of routers that prioritize a single best route, leading to confusion about how ECMP operates in contrast to traditional routing methods.
✗Equal-cost multipath means every route source is trusted equallyWrong answer — click to see why▾
Why this is wrong here
This option is incorrect because equal-cost multipath (ECMP) refers to the ability of a router to utilize multiple routes with the same cost for load balancing, not about the trustworthiness of route sources.
★ When this WOULD be the correct answer
In a question asking about route source trust in a network security context, where it states that multiple routing sources are treated with equal trust, this option could be correct. For example, a question might ask about scenarios in a network where all routing information is considered equally valid regardless of the source.
Why candidates choose this
Candidates may find this option tempting because it suggests a concept of fairness in routing, which can be confused with the idea of equal-cost paths, leading to a misinterpretation of ECMP behavior.
✗Equal-cost multipath works only when no routing table existsWrong answer — click to see why▾
Why this is wrong here
This option is wrong because equal-cost multipath (ECMP) allows multiple routes to be installed and used for forwarding, rather than discarding all but the first route. In fact, ECMP is specifically designed to utilize multiple routes with the same cost for load balancing.
★ When this WOULD be the correct answer
In a different question asking about routing behavior when no routes are available in the routing table, stating that equal-cost multipath works only when no routing table exists could be correct if the context is about a theoretical scenario where routing decisions cannot be made due to a lack of available routes.
Why candidates choose this
Candidates might find this option tempting because it suggests a simplistic view of routing behavior, leading them to think that if no routes are available, then ECMP would not apply, which can create confusion about routing fundamentals.
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 frequent exam trap is the misconception that routers discard all but the first learned route to a destination, ignoring the presence of equal-cost multipath. Candidates may incorrectly assume that only one route is ever installed, leading to wrong answers. This mistake arises from confusing route selection with route installation and from not recognizing that many Cisco routing protocols actively support ECMP. Misunderstanding this can cause candidates to overlook how routers distribute traffic and maintain redundancy, resulting in incorrect conclusions about routing behavior.
Detailed technical explanation
How to think about this question
Equal-cost multipath (ECMP) is a routing technique that allows a router to install and use multiple routes to the same destination when those routes have identical metrics or costs. This capability enables the router to distribute traffic across several paths, improving bandwidth utilization and providing redundancy. In Cisco routing protocols like OSPF and EIGRP, ECMP is supported and commonly used to optimize network performance and resilience.
When a router receives multiple routes to a destination with the same cost, it compares their metrics and administrative distances. If these values are equal, the router installs all these routes into the routing table and uses them simultaneously for forwarding packets. The router typically balances traffic using per-packet or per-flow load balancing methods, depending on the platform and configuration. This behavior contrasts with selecting a single best route, which would leave other equal-cost paths unused.
A common exam trap is assuming that routers always select only one route to a destination, ignoring ECMP capabilities. Some candidates mistakenly believe that multiple equal-cost routes are discarded except for the first learned. However, Cisco routers actively use ECMP to enhance network efficiency. Understanding this behavior is crucial for interpreting routing tables and troubleshooting load balancing issues in real networks.
KKey Concepts to Remember
Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.
Routing protocols like OSPF and EIGRP support ECMP by advertising and installing multiple equal-cost routes in the routing table.
The router compares route metrics and administrative distances to determine if multiple routes qualify for ECMP installation.
When multiple equal-cost routes exist, the router balances traffic across these paths to improve load distribution and redundancy.
ECMP behavior prevents the router from discarding all but one route when multiple equal-cost routes are available.
Administrative distance influences route selection but does not affect the router’s ability to use ECMP for equal-cost routes.
ECMP is a routing-table behavior that requires an existing routing table and does not function without it.
Understanding ECMP helps avoid misinterpretation of routing table entries and improves troubleshooting of routing and load balancing.
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
Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.
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 equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use..
What is the correct answer to this question?
The correct answer is: The router may install multiple equally good routes to the same destination and use them for forwarding — Equal-cost multipath allows a router to use more than one path to the same destination when those paths are considered equally good by the routing logic. In plain language, if the router sees multiple valid routes with the same cost or equivalent preference, it may install more than one and share traffic across them. This can improve redundancy and load distribution without requiring one path to sit idle.
This concept is important because learners often assume the router must always choose only one path. In reality, many routing environments support multiple equal paths simultaneously. The correct answer is the one that captures this multi-path forwarding behavior.
What should I do if I get this 200-301 question wrong?
Review equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Equal-cost multipath allows a router to install multiple routes with the same metric to the same destination for simultaneous use.
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