Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Exhibit
R1(config)# ipv6 route ::/0 2001:db8:ff::1
Based on the exhibit, what is the operational purpose of the configured IPv6 route?
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
It provides a fallback path for unknown remote IPv6 destinations.
This is correct because ::/0 defines the route of last resort for IPv6.
B
Distractor review
It enables OSPFv3 on the upstream interface.
This is wrong because the command is a static-route statement, not an OSPFv3 command.
C
Distractor review
It converts link-local addresses into global unicast addresses.
This is wrong because routing does not change address types that way.
D
Distractor review
It summarizes all IPv6 routes into one /64 route.
This is wrong because ::/0 is a default route, not a /64 summary.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking the IPv6 default route (::/0) for a command that enables OSPFv3 or performs address translation. Some candidates incorrectly believe that the static route command configures OSPFv3 or converts link-local addresses to global unicast addresses. Another common error is interpreting ::/0 as a summary route with a /64 prefix, which it is not. Understanding that ::/0 is specifically a default route that provides a fallback path for all unknown IPv6 destinations is crucial to avoid these misconceptions.
Technical deep dive
How to think about this question
A default route in IPv6, represented as ::/0, serves as a catch-all path for any destination address that does not have a more specific route in the routing table. This route directs packets to a designated next-hop address or interface, simplifying routing decisions for unknown or less common destinations. In Cisco IOS, configuring a static default route for IPv6 ensures that the router forwards all unmatched IPv6 traffic toward a single upstream device, often an ISP or core router. The decision to use a default route is based on the principle of route summarization and efficiency. When a router receives a packet destined for an IPv6 address not explicitly listed in its routing table, it consults the default route (::/0) to find the next hop. This behavior reduces the size and complexity of the routing table, especially in branch or edge networks where maintaining full routing information is impractical. Cisco routers prioritize more specific routes over the default route, ensuring optimal path selection. A common exam trap involves confusing the default route (::/0) with other routing concepts such as OSPFv3 configuration, address translation, or route summarization. The default route does not enable routing protocols or convert address types; it simply provides a fallback path. In practical networks, this default route is essential for small branch routers with a single upstream link, ensuring connectivity without extensive routing protocol overhead.
KKey Concepts to Remember
- An IPv6 default route (::/0) directs packets to a next-hop when no specific route matches the destination address.
- Cisco routers prioritize more specific IPv6 routes over the default route to ensure optimal path selection.
- Static IPv6 routes provide explicit forwarding instructions and do not enable dynamic routing protocols like OSPFv3.
- The default route simplifies routing tables in branch networks by providing a single path for unknown IPv6 destinations.
- IPv6 routing does not perform address conversion between link-local and global unicast addresses.
- A default route (::/0) is distinct from route summarization and does not represent a /64 prefix summary.
- Configuring a static default route is common in small branch routers with a single upstream connection.
- Misinterpreting ::/0 as an OSPFv3 command or address translation leads to common exam mistakes.
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?
An IPv6 default route (::/0) directs packets to a next-hop when no specific route matches the destination address.
What is the correct answer to this question?
The correct answer is: It provides a fallback path for unknown remote IPv6 destinations. — The configured route is a default route. In practical terms, it gives the router one simple next hop for any remote IPv6 destination that is not matched by a more specific entry. That is exactly what a small branch router often needs when it has a single upstream path. This is the same design logic as an IPv4 default route, but with IPv6 syntax and addressing.
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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