The correct answer is that the 'ipv6 unicast-routing' command enables IPv6 routing globally on the router, allows configuration of IPv6 routing protocols like OSPFv3, and enables IPv6 CEF switching. This command is essential because it activates the router’s IPv6 control plane, permitting dynamic routing protocol exchanges and efficient forwarding via Cisco Express Forwarding for IPv6. On the Cisco SPCOR 350-501 exam, this command often appears in questions testing your understanding of IPv6 foundational configuration versus interface-level or multicast settings. A common trap is confusing this global command with enabling IPv6 on an interface, which requires the 'ipv6 enable' or 'ipv6 address' command instead. Remember: think of 'ipv6 unicast-routing' as the master switch for the routing engine—without it, your OSPFv3 or EIGRP for IPv6 processes simply won’t start. A useful memory tip is “Unicast Routing Unlocks Protocols and CEF.”
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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.
Which THREE are valid reasons for using the 'ipv6 unicast-routing' command on a Cisco router?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It enables global IPv6 routing.
Options B, D, and E are correct. This command enables IPv6 routing globally (B), enables IPv6 CEF (D), and allows configuration of IPv6 routing protocols (E). Option A is incorrect; it does not enable IPv6 on interfaces. Option C is incorrect; IPv6 is enabled by default on some platforms, but the command does not enable multicast routing.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
Incorrect. Multicast routing is enabled with separate commands.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-501 OSPF questions on adjacency and route selection.
Networking — This question tests Networking — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: It enables global IPv6 routing. — Options B, D, and E are correct. This command enables IPv6 routing globally (B), enables IPv6 CEF (D), and allows configuration of IPv6 routing protocols (E). Option A is incorrect; it does not enable IPv6 on interfaces. Option C is incorrect; IPv6 is enabled by default on some platforms, but the command does not enable multicast routing.
What should I do if I get this 350-501 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-501 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Question Discussion
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