Question 416 of 1,819

IP Routing →mediumDrag & DropObjective-mapped

Quick Answer

The correct answer is to apply the `no passive-interface GigabitEthernet0/1` command after first enabling `passive-interface default` under the OSPFv2 process. This works because `passive-interface default` suppresses OSPF hello packets on all interfaces, preventing neighbor discovery and adjacency formation, while the `no passive-interface` command selectively re-enables hello transmission on the specified interface, allowing only that link to form a full OSPF neighbor relationship. On the CCNA 200-301 v2 exam, this scenario tests your understanding of OSPFv2 passive interface configuration as a security and efficiency measure, often appearing in drag-and-drop ordering questions where the trap is forgetting to first enter OSPF router configuration mode or placing the `no passive-interface` command before the default suppression. A reliable memory tip is to think "default shuts all doors, then no opens the one you need" — always apply the global suppression first, then the exception.

CCNA IP Routing Practice Question

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. 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.

Drag and drop the following steps into the correct order to configure Router R1 with OSPFv2 process 1 to form neighbor adjacencies only on GigabitEthernet0/1 while preventing OSPF hello packets on all other OSPF-enabled interfaces.

Question 1mediumdrag order

Review the full OSPF breakdown →

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

✓

router ospf 1

First, enter OSPF router configuration mode. Then assign a Router ID (optional but good practice). Next, advertise the local subnet with a network statement to enable OSPF on interfaces. Then apply passive-interface default to suppress hellos on all OSPF interfaces. Finally, use no passive-interface to allow adjacency on the specific interface.

Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

Common exam traps

Common exam trap: authentication is not authorization

Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.

Detailed technical explanation

How to think about this question

This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.

KKey Concepts to Remember

Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.

TExam Day Tips

Do not assume successful login means full administrative access.
Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
Separate login problems from permission problems before choosing the answer.

Key takeaway

Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.

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

Got this wrong? Here's your next step.

Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-301 questions on access control and AAA configuration.

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FAQ

Questions learners often ask

What does this 200-301 question test?

IP Routing — This question tests IP Routing — Authentication checks who the user is..

What is the correct answer to this question?

The correct answer is: router ospf 1 — First, enter OSPF router configuration mode. Then assign a Router ID (optional but good practice). Next, advertise the local subnet with a network statement to enable OSPF on interfaces. Then apply passive-interface default to suppress hellos on all OSPF interfaces. Finally, use no passive-interface to allow adjacency on the specific interface.

What should I do if I get this 200-301 question wrong?

What is the key concept behind this question?

Authentication checks who the user is.

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