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IP Routing →hardConfigurationObjective-mapped

CCNA IP Routing Practice Question

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. 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.

Network Topology
G0/02001:db8:0:1::1/64G0/02001:db8:0:1::2/64linkR1R2

You are connected to R1, a router that must establish OSPFv3 adjacency with R2 over the directly connected link G0/0. The current configuration is incomplete: OSPFv3 process is configured but not enabled on the interface, and global IPv6 unicast routing is missing. Configure R1 so that it becomes an OSPFv3 neighbor with R2 and learns the loopback route 2001:db8:1:2::/64 via OSPFv3. Then verify neighbor state and routing table.

Question 1hardConfiguration
Review the full OSPF breakdown →

Exhibit

R1#show running-config | section ipv6
ipv6 router ospf 1
 router-id 1.1.1.1
!
interface GigabitEthernet0/0
 ipv6 address 2001:db8:0:1::1/64
 no shutdown
!
interface Loopback0
 ipv6 address 2001:db8:1:1::1/64
!

R1#show ipv6 interface brief
GigabitEthernet0/0    [up/up]
    FE80::1
    2001:db8:0:1::1
Loopback0             [up/up]
    FE80::1
    2001:db8:1:1::1

R2 (partial config for context):
ipv6 unicast-routing
ipv6 router ospf 1
 router-id 2.2.2.2
!
interface GigabitEthernet0/0
 ipv6 address 2001:db8:0:1::2/64
 ipv6 ospf 1 area 0
 no shutdown
!
interface Loopback0
 ipv6 address 2001:db8:1:2::2/64
 ipv6 ospf 1 area 0

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

✓

Enable IPv6 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.

R1 is missing two critical configurations: global IPv6 unicast routing must be enabled with 'ipv6 unicast-routing', and OSPFv3 must be activated on GigabitEthernet0/0 using 'ipv6 ospf 1 area 0' under the interface. Without these, R1 cannot send or receive OSPFv3 hellos, so no adjacency forms and routes are not exchanged. After applying both commands, the neighbor state becomes FULL and the remote loopback appears in the IPv6 routing table.

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

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✓

    Enable IPv6 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.

    Why this is correct

    This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding on the router, which is required for OSPFv3 to operate. The 'ipv6 ospf 1 area 0' command under the interface activates OSPFv3 process 1 in area 0 on that link, allowing R1 to send and receive OSPFv3 hello packets and form an adjacency with R2.

    Related concept

    Authentication checks who the user is.

  • ✗

    Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'network' command under the OSPFv3 router configuration mode.

    Why it's wrong here

    This is incorrect because OSPFv3 does not use the 'network' command under the router configuration mode to enable OSPF on interfaces. Unlike OSPFv2, OSPFv3 is enabled directly on the interface using the 'ipv6 ospf' command.

  • ✗

    Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'router-id' command to ensure adjacency.

    Why it's wrong here

    This is incorrect because while a router ID is necessary for OSPFv3, the primary missing configuration is enabling OSPFv3 on the interface. Without the 'ipv6 ospf' command on the interface, no hellos are sent and no adjacency forms, regardless of the router ID.

  • ✗

    Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'passive-interface default' command to allow adjacency.

    Why it's wrong here

    This is incorrect because the 'passive-interface default' command suppresses OSPF hello packets on all interfaces, preventing adjacency formation. To form an adjacency, the interface must not be passive, and OSPFv3 must be explicitly enabled on it.

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.

✓Enable IPv6 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'.Correct answer▾

Why this is correct

This is correct because 'ipv6 unicast-routing' enables IPv6 forwarding on the router, which is required for OSPFv3 to operate. The 'ipv6 ospf 1 area 0' command under the interface activates OSPFv3 process 1 in area 0 on that link, allowing R1 to send and receive OSPFv3 hello packets and form an adjacency with R2.

✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'network' command under the OSPFv3 router configuration mode.Wrong answer — click to see why▾

Why this is wrong here

The specific factual error is that OSPFv3 uses interface-level configuration, not network statements under the OSPF process.

Why candidates choose this

Candidates familiar with OSPFv2 might mistakenly apply the same 'network' command logic to OSPFv3, not realizing the difference in configuration method.

✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'router-id' command to ensure adjacency.Wrong answer — click to see why▾

Why this is wrong here

The specific factual error is that setting a router ID alone does not activate OSPFv3 on an interface; OSPFv3 must be explicitly enabled on the interface.

Why candidates choose this

Candidates may think that configuring a router ID is the key missing step, especially if they see OSPFv3 process running but no neighbor forming, but they overlook the interface activation.

✗Enable IPv6 unicast routing globally and configure OSPFv3 process 1 with the 'passive-interface default' command to allow adjacency.Wrong answer — click to see why▾

Why this is wrong here

The specific factual error is that 'passive-interface default' would actually prevent adjacency, not help form it.

Why candidates choose this

Candidates might confuse 'passive-interface' with enabling OSPF on an interface, or think that making an interface passive is necessary for OSPF to work, but the opposite is true for adjacency formation.

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: 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.

Trap categories for this question

  • Command / output trap

    This is incorrect because OSPFv3 does not use the 'network' command under the router configuration mode to enable OSPF on interfaces. Unlike OSPFv2, OSPFv3 is enabled directly on the interface using the 'ipv6 ospf' command.

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: Enable IPv6 unicast routing globally and activate OSPFv3 on GigabitEthernet0/0 with the command 'ipv6 ospf 1 area 0'. — R1 is missing two critical configurations: global IPv6 unicast routing must be enabled with 'ipv6 unicast-routing', and OSPFv3 must be activated on GigabitEthernet0/0 using 'ipv6 ospf 1 area 0' under the interface. Without these, R1 cannot send or receive OSPFv3 hellos, so no adjacency forms and routes are not exchanged. After applying both commands, the neighbor state becomes FULL and the remote loopback appears in the IPv6 routing table.

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

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.

What is the key concept behind this question?

Authentication checks who the user is.

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Last reviewed: Jun 6, 2026

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