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Which command correctly configures an IPv6 default route using next-hop address 2001:db8:1::1?

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Which command correctly configures an IPv6 default route using next-hop address 2001:db8:1::1?

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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:db8:1::1

Correct. This is the valid IOS syntax for an IPv6 default route.

B

Distractor review

ip route :: 2001:db8:1::1

This mixes IPv4 command structure with IPv6 addressing.

C

Distractor review

ipv6 default-route 2001:db8:1::1

That is not the standard IOS syntax for configuring an IPv6 default route.

D

Distractor review

ip default-gateway 2001:db8:1::1

ip default-gateway is not how an IPv6 routed default is configured on a router.

Common exam trap

Common exam trap: answer the scenario, not the keyword

A common exam trap is confusing IPv4 and IPv6 routing commands, such as using 'ip route' with IPv6 addresses or 'ip default-gateway' for IPv6 routing. These commands are either IPv4-specific or management-related and do not configure IPv6 default routes. Another trap is miswriting the IPv6 default route prefix; the correct prefix is ::/0, representing all IPv6 addresses. Using incorrect prefixes or command structures leads to invalid configurations that do not forward IPv6 traffic properly, causing routing failures and connectivity issues.

Technical deep dive

How to think about this question

IPv6 routing relies on static and dynamic routes to forward packets to their destinations. A default route in IPv6 is represented by the prefix ::/0, which matches any IPv6 address not explicitly listed in the routing table. This default route acts as a catch-all path, directing packets to a next-hop router when no more specific route exists. Configuring this route is essential for enabling IPv6 connectivity beyond the local network segment. Cisco IOS uses the 'ipv6 route' command to configure static IPv6 routes. The syntax requires specifying the destination prefix, such as ::/0 for the default route, followed by the next-hop IPv6 address or an exit interface. This command differs from IPv4 routing commands, which use 'ip route' and IPv4 addresses. Mixing these commands or using incorrect prefixes results in invalid configurations. The router uses the next-hop address to forward packets toward the destination network efficiently. A frequent source of confusion is the misuse of IPv4 commands or incorrect prefixes when configuring IPv6 routes. For example, 'ip route :: 2001:db8:1::1' is invalid because 'ip route' expects IPv4 addresses. Similarly, 'ip default-gateway' only sets the IPv4 default gateway for management traffic and does not affect IPv6 routing. Understanding these distinctions and using the correct 'ipv6 route ::/0' syntax ensures proper routing behavior and prevents connectivity issues in IPv6 networks.

KKey Concepts to Remember

  • IPv6 default routes use the prefix ::/0 to represent all possible IPv6 addresses not matched by more specific routes.
  • The Cisco IOS command to configure an IPv6 static route requires the syntax 'ipv6 route' followed by the destination prefix and the next-hop IPv6 address or exit interface.
  • IPv6 routing commands differ from IPv4 commands; mixing IPv4 syntax with IPv6 addresses results in invalid configurations.
  • The 'ip default-gateway' command configures a default gateway for IPv4 management traffic and does not affect IPv6 routing.
  • Cisco routers use the next-hop address in static routes to forward packets toward the destination network efficiently.
  • Configuring an IPv6 default route ensures packets with unknown destinations are forwarded to a specified next-hop router.
  • Incorrect command syntax or mixing IPv4 and IPv6 commands can cause routing failures and prevent proper packet forwarding.
  • Understanding the correct IOS syntax for IPv6 static routes is essential for effective network connectivity and routing in IPv6 environments.

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 default routes use the prefix ::/0 to represent all possible IPv6 addresses not matched by more specific routes.

What is the correct answer to this question?

The correct answer is: ipv6 route ::/0 2001:db8:1::1 — The IPv6 default route uses the prefix ::/0. On Cisco IOS, the correct syntax is ipv6 route ::/0 followed by the next-hop address or exit interface.

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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