The correct command is ipv6 route ::/0 2001:db8:ff::1, which configures an IPv6 default static route. This works because ::/0 represents all IPv6 destinations, just as 0.0.0.0/0 does for IPv4, making it the route of last resort for any unknown traffic. On the CCNA 200-301 v2 exam, this tests your understanding of IPv6 static routing syntax and the concept of a default gateway in an IPv6-only branch environment. A common trap is confusing the IPv6 prefix length—remember that ::/0 is the exact IPv6 equivalent of 0.0.0.0/0, and the command uses the ipv6 route keyword, not the ip route keyword used for IPv4. For a memory tip, think of the double colon as “catch everything” and the /0 as “zero specificity,” so the router sends all unknown packets to the specified next hop.
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. A key principle to apply: iPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.. 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(config)# ?
R1 is an IPv6-only branch router. The administrator wants all unknown IPv6 destinations to be sent to the upstream router at 2001:db8:ff::1. Which command best achieves that goal?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ipv6 route ::/0 2001:db8:ff::1
The correct configuration is an IPv6 default static route pointing to the upstream next hop. In practical terms, this is the IPv6 version of a route of last resort. The router does not need specific entries for every remote IPv6 network if all unknown traffic should go to the upstream device.
The key distinction is that IPv6 static routing uses IPv6 syntax and the double-colon default prefix representation. This is a foundational branch-routing concept for IPv6 deployments.
Key principle: IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
ipv6 route ::/0 2001:db8:ff::1
Why this is correct
This is correct because ::/0 is the IPv6 default route and the next hop is the upstream router.
Clue confirmation
The clue words "best", "which command" in the question point toward this answer.
Related concept
IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.
✗
ip route 0.0.0.0 0.0.0.0 2001:db8:ff::1
Why it's wrong here
This is wrong because that is IPv4 syntax with an IPv6 next hop.
When this WOULD be correct
In a scenario where the question specifies an IPv4 router needing to route all unknown IPv4 destinations to a specific IPv6 address, this command could be correct if the router supports dual-stack configurations and can handle IPv4 routes to IPv6 addresses.
✗
ipv6 route 2001:db8:ff::/64 ::1
Why it's wrong here
This is wrong because it creates a specific route, not a default route.
When this WOULD be correct
If the question specified that the goal was to route traffic specifically for the subnet 2001:db8:ff::/64 to a local interface or a different router configured at ::1, then option C would be correct as it would direct traffic for that specific subnet appropriately.
✗
ipv6 default-gateway 2001:db8:ff::1
Why it's wrong here
This is wrong because that is not the normal router static-routing syntax for this case.
When this WOULD be correct
If the question were about configuring a default gateway for an IPv4 router that also supports IPv6, and the goal was to set a default gateway for IPv4 traffic, then 'ipv6 default-gateway 2001:db8:ff::1' could be correct if the router had dual-stack capabilities.
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.
✓ipv6 route ::/0 2001:db8:ff::1Correct answer▾
Why this is correct
This is correct because ::/0 is the IPv6 default route and the next hop is the upstream router.
✗ip route 0.0.0.0 0.0.0.0 2001:db8:ff::1Wrong answer — click to see why▾
Why this is wrong here
The command 'ip route' is used for IPv4 static routes, not IPv6. Additionally, the syntax '0.0.0.0 0.0.0.0' is an IPv4 default route, but the next hop is an IPv6 address, which is invalid. IPv6 static routes require the 'ipv6 route' command.
★ When this WOULD be the correct answer
In a scenario where the question specifies an IPv4 router needing to route all unknown IPv4 destinations to a specific IPv6 address, this command could be correct if the router supports dual-stack configurations and can handle IPv4 routes to IPv6 addresses.
Why candidates choose this
Students may confuse the IPv4 default route syntax with IPv6, or think that the 'ip route' command can accept an IPv6 next hop. The similarity in concept (default route) makes this option tempting.
✗ipv6 route 2001:db8:ff::/64 ::1Wrong answer — click to see why▾
Why this is wrong here
This command creates a static route for the specific prefix 2001:db8:ff::/64, not a default route. The next hop ::1 is the IPv6 unspecified address (loopback), which is incorrect for forwarding to an upstream router. It does not match the requirement of sending all unknown destinations.
★ When this WOULD be the correct answer
If the question specified that the goal was to route traffic specifically for the subnet 2001:db8:ff::/64 to a local interface or a different router configured at ::1, then option C would be correct as it would direct traffic for that specific subnet appropriately.
Why candidates choose this
A student might think that specifying a route to the upstream network is sufficient, or confuse the unspecified address ::1 with a valid next-hop address. The presence of 'ipv6 route' and an IPv6 address may seem plausible.
✗ipv6 default-gateway 2001:db8:ff::1Wrong answer — click to see why▾
Why this is wrong here
The 'ipv6 default-gateway' command is used on hosts, not routers. On a Cisco router, the correct way to set a default route is with 'ipv6 route ::/0 <next-hop>'. This command does not exist in router IOS for static routing.
★ When this WOULD be the correct answer
If the question were about configuring a default gateway for an IPv4 router that also supports IPv6, and the goal was to set a default gateway for IPv4 traffic, then 'ipv6 default-gateway 2001:db8:ff::1' could be correct if the router had dual-stack capabilities.
Why candidates choose this
The term 'default-gateway' is commonly used in host networking, and students may mistakenly apply it to routers. The IPv6 prefix and next-hop address look correct, making it tempting for those unfamiliar with router configuration.
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 common exam trap is confusing IPv4 and IPv6 routing commands by attempting to use the ip route command with an IPv6 next-hop address. This is invalid because ip route is strictly for IPv4 static routes. Another trap is using ipv6 default-gateway, which is not a valid static routing command and does not install a route in the routing table. These mistakes cause the router to drop unknown IPv6 traffic since no default route is installed. Candidates must recognize that IPv6 static routes require the ipv6 route command with the ::/0 prefix for default routing.
Detailed technical explanation
How to think about this question
IPv6 routing uses a different syntax and addressing scheme compared to IPv4. The default route in IPv6 is represented as ::/0, which matches any IPv6 address not explicitly found in the routing table. Configuring a static default route with the command ipv6 route ::/0 <next-hop-address> directs all unknown IPv6 traffic to the specified next-hop router. This is essential for IPv6-only routers that need a route of last resort to forward packets to upstream devices.
When configuring static routes on Cisco routers for IPv6, the command ipv6 route is used followed by the destination prefix and the next-hop IPv6 address. The router uses this static route to forward packets when no more specific route exists. The next-hop address must be reachable and correctly configured on the router interface. This method differs from IPv4 static routing syntax and requires understanding of IPv6 addressing and routing principles.
A common exam trap is confusing IPv4 and IPv6 routing commands or using incorrect syntax such as ip route with an IPv6 address or using default-gateway commands that do not apply to routing. The practical behavior in Cisco IOS is that only the correct ipv6 route ::/0 <next-hop> command installs a default route in the IPv6 routing table, enabling proper forwarding of unknown destinations. Misconfiguration leads to dropped packets or routing failures.
KKey Concepts to Remember
IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.
The ipv6 route command configures static routes in IPv6, specifying the destination prefix and next-hop IPv6 address.
A static default route in IPv6 acts as a route of last resort, forwarding packets when no specific route exists.
The next-hop IPv6 address in a static route must be reachable and correctly configured on the router interface.
Using ipv6 default-gateway is incorrect for routing purposes; it is not a valid command for static routing configuration.
IPv6 static routing syntax differs from IPv4, so understanding the correct command format is critical for CCNA routing tasks.
Incorrectly configuring static routes with mismatched protocols or syntax results in routing failures and unreachable networks.
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
IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 iPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations., then practise related 200-301 questions on the same topic to reinforce the concept.
IP Routing — This question tests IP Routing — IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations..
What is the correct answer to this question?
The correct answer is: ipv6 route ::/0 2001:db8:ff::1 — The correct configuration is an IPv6 default static route pointing to the upstream next hop. In practical terms, this is the IPv6 version of a route of last resort. The router does not need specific entries for every remote IPv6 network if all unknown traffic should go to the upstream device.
The key distinction is that IPv6 static routing uses IPv6 syntax and the double-colon default prefix representation. This is a foundational branch-routing concept for IPv6 deployments.
What should I do if I get this 200-301 question wrong?
Review iPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best", "which command". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
IPv6 uses the ::/0 prefix to represent the default route that matches all unknown IPv6 destinations.
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