This 200-301 practice question tests your understanding of ip routing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: oSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.. 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.
Exhibit
R1 interface to LAN: 192.168.50.1/24 on G0/1
R1 OSPF config:
router ospf 1
network 192.168.5.0 0.0.0.255 area 0
network 10.0.12.0 0.0.0.3 area 0
An OSPF-enabled router R1 fails to advertise the 192.168.50.0/24 network to neighbor R2, even though the neighbor relationship is up. Which misconfiguration on R1 would cause this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The wildcard network statement does not match 192.168.50.0/24
If the network statement on R1 does not match the interface connected to 192.168.50.0/24, OSPF will not enable on that interface and the subnet will not be advertised. The route stays absent from neighbors despite OSPF running elsewhere.
Key principle: OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.
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 OSPF process must be process ID 50 to advertise 192.168.50.0/24
Why it's wrong here
Distractor.
When this WOULD be correct
In a different scenario where a question states that R1 is configured to use a specific OSPF process ID (e.g., 50) and asks if R2 can receive advertisements from R1, this option would be correct if R2's configuration also required matching that process ID to receive updates.
✓
The wildcard network statement does not match 192.168.50.0/24
Why this is correct
Correct choice.
Related concept
OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.
✗
OSPF cannot advertise a directly connected LAN
Why it's wrong here
Distractor.
When this WOULD be correct
In a different scenario where the question states that R1 is configured to only advertise certain subnets and the specific subnet in question is not directly connected, then this option could be correct. For example, if the question specifies that R1 is configured to only advertise subnets that are not directly connected to its interfaces.
✗
R2 needs a default route before learning intra-area routes
Why it's wrong here
Distractor.
When this WOULD be correct
In a different scenario where the question states that R2 is configured to only accept routes if a default route is present, this option would be correct. For example, if R2's routing policy required a default route to be configured before accepting any OSPF routes, then this statement would apply.
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 wildcard network statement does not match 192.168.50.0/24Correct answer▾
Why this is correct
Correct choice.
✗The OSPF process must be process ID 50 to advertise 192.168.50.0/24Wrong answer — click to see why▾
Why this is wrong here
The OSPF process ID is locally significant and does not need to match the network number or any other value. OSPF can advertise any subnet regardless of the process ID. The process ID only identifies the OSPF process on the local router and has no effect on route advertisement.
★ When this WOULD be the correct answer
In a different scenario where a question states that R1 is configured to use a specific OSPF process ID (e.g., 50) and asks if R2 can receive advertisements from R1, this option would be correct if R2's configuration also required matching that process ID to receive updates.
Why candidates choose this
Students often mistakenly think that the OSPF process ID must match the network number or area ID, confusing it with other protocols like EIGRP where the autonomous system number must match between routers.
✗OSPF cannot advertise a directly connected LANWrong answer — click to see why▾
Why this is wrong here
OSPF can advertise directly connected LANs as long as the interface is enabled for OSPF via the network statement or passive-interface default. There is no restriction that prevents OSPF from advertising directly connected LANs.
★ When this WOULD be the correct answer
In a different scenario where the question states that R1 is configured to only advertise certain subnets and the specific subnet in question is not directly connected, then this option could be correct. For example, if the question specifies that R1 is configured to only advertise subnets that are not directly connected to its interfaces.
Why candidates choose this
Some students confuse OSPF with BGP, which by default does not advertise directly connected networks unless explicitly configured with the network command. Additionally, the concept of 'passive interface' might lead to confusion, but OSPF can still advertise the subnet even if the interface is passive.
✗R2 needs a default route before learning intra-area routesWrong answer — click to see why▾
Why this is wrong here
OSPF does not require a default route to learn intra-area routes. OSPF routers exchange link-state advertisements to build a complete topology database and calculate routes to all networks within an area. A default route is only needed for routing to external networks not in the OSPF domain.
★ When this WOULD be the correct answer
In a different scenario where the question states that R2 is configured to only accept routes if a default route is present, this option would be correct. For example, if R2's routing policy required a default route to be configured before accepting any OSPF routes, then this statement would apply.
Why candidates choose this
Students may confuse OSPF with stub areas or default routing concepts. In some OSPF area types (like stub areas), a default route is injected, but for standard intra-area routes, no default is required.
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 believing that the OSPF process ID must match across routers to advertise specific networks or that OSPF cannot advertise directly connected LANs. Candidates may also incorrectly assume that a default route is required on a router before it can learn intra-area routes. These misconceptions lead to overlooking the actual cause: a mismatched wildcard mask in the network statement that prevents OSPF from activating on the interface. This trap causes candidates to focus on irrelevant configuration elements instead of verifying the network statement accuracy.
Detailed technical explanation
How to think about this question
Open Shortest Path First (OSPF) is a link-state routing protocol that relies on interfaces being explicitly included in the OSPF process via network statements. These network statements use IP address and wildcard mask pairs to identify which interfaces participate in OSPF. The wildcard mask is a bitwise inverse of a subnet mask and determines which bits of the IP address must match exactly and which bits can vary. This mechanism allows precise control over which interfaces are advertised in OSPF.
When configuring OSPF on Cisco routers, the network statement must correctly match the IP address of the interface connected to the subnet intended for advertisement. If the wildcard mask is incorrect or does not cover the interface's IP address, OSPF will not activate on that interface, and the subnet will not be advertised to neighbors. This prevents other routers from learning routes to that subnet, causing routing failures even though OSPF is running on other interfaces.
A common exam trap is assuming that the OSPF process ID or the nature of the subnet (such as being directly connected) affects route advertisement. In reality, the process ID is locally significant and does not impact route advertisement between routers. Also, directly connected LANs are advertised if included in the OSPF process. The practical implication is that network engineers must carefully verify wildcard masks in OSPF configurations to ensure all intended subnets are advertised and reachable across the OSPF domain.
KKey Concepts to Remember
OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.
A wildcard mask in OSPF network statements specifies which bits of the IP address to ignore, allowing flexible matching of interface IP addresses.
If the OSPF network statement does not match an interface's IP address, OSPF will not enable on that interface and will not advertise its subnet.
OSPF routers advertise only those networks explicitly included by matching network statements in the OSPF configuration.
OSPF process ID is locally significant and does not affect the ability to advertise specific networks between routers.
Directly connected LANs can be advertised in OSPF if their interfaces are included in the OSPF network statements.
OSPF does not require a default route to learn intra-area routes; it learns routes from neighbors based on LSAs and area topology.
Incorrect wildcard masks in OSPF configurations are a common cause of missing routes in OSPF neighbor routing tables.
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
OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.
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 oSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets..
What is the correct answer to this question?
The correct answer is: The wildcard network statement does not match 192.168.50.0/24 — If the network statement on R1 does not match the interface connected to 192.168.50.0/24, OSPF will not enable on that interface and the subnet will not be advertised. The route stays absent from neighbors despite OSPF running elsewhere.
What should I do if I get this 200-301 question wrong?
Review oSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
OSPF uses network statements with wildcard masks to determine which interfaces participate in the OSPF routing process and advertise their connected subnets.
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