- A
The router 10.1.1.2 is advertising two links: one to a transit network and one to a stub network, both with cost 10.
The LSA shows exactly that: a transit link (to a DR) and a stub link (192.168.1.0/24), both with metric 10.
- B
The router 10.1.1.2 is the DR for the transit network 10.1.1.0/24.
Why wrong: The LSA shows the DR address is 10.1.1.2, but that does not necessarily mean 10.1.1.2 is the DR; it could be the interface address of the DR.
- C
The router 10.1.1.2 is advertising a single link to a point-to-point network.
Why wrong: The LSA shows two links, not one, and they are transit and stub, not point-to-point.
- D
The router 10.1.1.2 has a misconfigured network type because it shows both transit and stub links.
Why wrong: It is normal for a router to advertise both transit and stub links in its Router LSA; this is not a misconfiguration.
Quick Answer
The answer is that router 10.1.1.2 is advertising two links: one to a transit network and one to a stub network, both with a cost of 10. This is correct because the OSPF Router LSA output explicitly lists two link types under “Number of Links: 2”—the first is a Transit Network link identified by the Designated Router address, and the second is a Stub Network link identified by the subnet and mask. In OSPF, transit links represent connections to multi-access networks where a DR exists, while stub links represent directly attached subnets or loopbacks. On the Cisco CCNP ENARSI 300-410 exam, interpreting OSPF Router LSA link types is a core skill for troubleshooting routing issues, and a common trap is confusing the Link ID for a transit network (which is the DR’s router ID) with the router’s own interface address. Remember the memory tip: “Transit talks to DR, Stub is a subnet”—transit links always point to a DR, while stub links always show a network mask.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# show ip ospf database router 10.1.1.2
OSPF Router with ID (10.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 150 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 10.1.1.2 Advertising Router: 10.1.1.2 LS Seq Number: 80000002 Checksum: 0x1234 Length: 48 Number of Links: 2
Link connected to: a Transit Network (Link ID) Designated Router address: 10.1.1.2 (Link Data) Router Interface address: 10.1.1.2 Number of TOS metrics: 0 TOS 0 Metrics: 10
Link connected to: a Stub Network (Link ID) Network/subnet number: 192.168.1.0 (Link Data) Network Mask: 255.255.255.0 Number of TOS metrics: 0 TOS 0 Metrics: 10
What does this output indicate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The router 10.1.1.2 is advertising two links: one to a transit network and one to a stub network, both with cost 10.
The output shows two links in the Router LSA from router 10.1.1.2: a transit network link (to a DR) and a stub network link (to a subnet). Both links have a metric of 10, confirming that router 10.1.1.2 is advertising exactly two links with equal cost. This matches option A exactly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 10.1.1.2 is advertising two links: one to a transit network and one to a stub network, both with cost 10.
- ✗
The router 10.1.1.2 is the DR for the transit network 10.1.1.0/24.
Why it's wrong here
The LSA shows the DR address is 10.1.1.2, but that does not necessarily mean 10.1.1.2 is the DR; it could be the interface address of the DR.
- ✗
The router 10.1.1.2 is advertising a single link to a point-to-point network.
Why it's wrong here
The LSA shows two links, not one, and they are transit and stub, not point-to-point.
- ✗
The router 10.1.1.2 has a misconfigured network type because it shows both transit and stub links.
Why it's wrong here
It is normal for a router to advertise both transit and stub links in its Router LSA; this is not a misconfiguration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the ability to interpret the 'Link connected to' fields in a Router LSA, where candidates may mistakenly think a transit link implies a point-to-point connection or that a stub link indicates a misconfiguration, rather than recognizing both are normal for a DR on a multi-access network.
Trap categories for this question
Command / output trap
The LSA shows the DR address is 10.1.1.2, but that does not necessarily mean 10.1.1.2 is the DR; it could be the interface address of the DR.
Detailed technical explanation
How to think about this question
In OSPF, a Router LSA (Type 1) describes the router's links to areas. A transit network link (type 2) indicates a connection to a multi-access network where the router is the DR, while a stub network link (type 3) advertises a directly connected subnet. The LS Type, Link State ID, and Advertising Router fields confirm this is a Type 1 LSA from 10.1.1.2. The presence of both link types is expected when a router is the DR on a broadcast network and also has a connected stub network.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router 10.1.1.2 is advertising two links: one to a transit network and one to a stub network, both with cost 10. — The output shows two links in the Router LSA from router 10.1.1.2: a transit network link (to a DR) and a stub network link (to a subnet). Both links have a metric of 10, confirming that router 10.1.1.2 is advertising exactly two links with equal cost. This matches option A exactly.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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