CCNA IP Routing Practice Question
Network Topology
You are connected to R1. Configure IPv4 and IPv6 static routes, default routes, and floating static routes so that R1 can reach the Internet via R2 (IPv4 and IPv6). The primary route to the Internet should use next-hop 203.0.113.2 (IPv4) and 2001:db8:203:0:113::2 (IPv6). A backup floating static route with administrative distance 200 must exist for IPv4 only, using next-hop 198.51.100.2. Ensure the default routes are correctly configured and troubleshoot any recursive routing failure. Note: R1 currently has an incorrect IPv6 default route pointing to 2001:db8:198:51:100::2 that must be removed.
⚠ Common exam trap
The trap is that candidates may think the floating route needs to be modified or that the primary route should also have a high AD. Remember: a floating static route must have a higher AD than the primary route to act as a backup. Also, do not forget IPv6 if the question specifies it.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove the incorrect IPv6 default route: no ipv6 route ::/0 2001:db8:198:51:100::2; configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2
The IPv4 floating route is already correctly pre-configured with AD 200 to serve as a backup. To meet the requirements, you must add the primary IPv4 default route with default AD 1, remove the existing incorrect IPv6 default route, and add the correct IPv6 default route. Option A correctly identifies these steps, while other options either omit the removal, assign a wrong AD to the primary route, or neglect IPv6 entirely.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Remove the incorrect IPv6 default route: no ipv6 route ::/0 2001:db8:198:51:100::2; configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2
Why this is correct
This option completes all required tasks: it removes the conflicting IPv6 default route, adds the primary IPv4 default route with default AD, and adds the correct IPv6 default route, while the IPv4 floating route with AD 200 already exists.
- ✗
Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; change the floating route AD to 1; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2
Why it's wrong here
This is incorrect because changing the floating route's AD to 1 would make both routes have the same AD, causing load balancing or unpredictable behavior, not a backup. The floating route must have a higher AD to serve as a backup.
- ✗
Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2 200; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2
Why it's wrong here
This is incorrect because the primary route should have the default AD of 1, not 200. Assigning AD 200 to the primary route makes it equal to the floating route, so neither takes precedence, and the router may not use the intended path.
- ✗
Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; no IPv6 route is needed because IPv6 is not required.
Why it's wrong here
This option is incorrect because the question explicitly requires IPv6 static routes to reach the Internet, so omitting the IPv6 default route fails a core requirement. Even if IPv6 was not explicitly tested, a dual-stack router must have a valid default route for both address families to forward traffic to all destinations. Without the `ipv6 route ::/0` command, R1 will drop any IPv6 packet destined beyond the local network, making IPv6 connectivity impossible. The belief that IPv6 is optional is a false assumption in this scenario, as the question states that both IPv4 and IPv6 Internet reachability must be configured.
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.
✓Remove the incorrect IPv6 default route: no ipv6 route ::/0 2001:db8:198:51:100::2; configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2Correct answer▾
Why this is correct
This option completes all required tasks: it removes the conflicting IPv6 default route, adds the primary IPv4 default route with default AD, and adds the correct IPv6 default route, while the IPv4 floating route with AD 200 already exists.
✗Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; change the floating route AD to 1; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2Wrong answer — click to see why▾
Why this is wrong here
Setting the floating route AD to 1 makes it equal to the primary route's AD, defeating the purpose of a floating static route.
Why candidates choose this
Candidates may think that both routes need the same AD to work, but that would cause equal-cost multipath, not a backup.
✗Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2 200; the floating route is already configured with AD 200; add IPv6 default route: ipv6 route ::/0 2001:db8:203:0:113::2Wrong answer — click to see why▾
Why this is wrong here
The primary route must have a lower AD than the floating route to be preferred. Setting it to 200 makes it equal to the backup, causing ambiguity.
Why candidates choose this
Candidates might think that setting a higher AD on the primary route ensures the floating route is used, but that reverses the intended behavior.
✗Configure the primary default route: ip route 0.0.0.0 0.0.0.0 203.0.113.2; the floating route is already configured with AD 200; no IPv6 route is needed because IPv6 is not required.Wrong answer — click to see why▾
Why this is wrong here
The question states 'IPv4 and IPv6 static routes, default routes' and specifies an IPv6 next-hop. Ignoring IPv6 is a direct violation of the requirements.
Why candidates choose this
Candidates might overlook the IPv6 requirement or think that only IPv4 is needed, but the question clearly includes IPv6.
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?”
Go deeper
Related to this question
Learn chapter
OSPFv3 Single-Area Configuration for IPv6
Key term
Internet Protocol
Internet Protocol (IP) is the set of rules that governs how data is addressed, routed, and sent from one device to another across networks, including the internet.
Key term
Static route
A static route is a manually configured path in a router's routing table that tells the router exactly where to send packets for a specific destination network.
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