Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
ipv6 route ::/0 2001:db8:ff::1
This is correct because ::/0 is the IPv6 default route and the next hop is the upstream router.
B
Distractor review
ip route 0.0.0.0 0.0.0.0 2001:db8:ff::1
This is wrong because that is IPv4 syntax with an IPv6 next hop.
C
Distractor review
ipv6 route 2001:db8:ff::/64 ::1
This is wrong because it creates a specific route, not a default route.
D
Distractor review
ipv6 default-gateway 2001:db8:ff::1
This is wrong because that is not the normal router static-routing syntax for this case.
Common exam trap
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.
Technical deep dive
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.
- Cisco routers require IPv6-specific routing commands; mixing IPv4 commands with IPv6 addresses causes configuration errors.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
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?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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