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IP Routing →hardTroubleshootingObjective-mapped

Quick Answer

The answer is to remove the incorrect IPv6 default route, configure the primary IPv4 and IPv6 default routes, and rely on the pre-configured floating static route with administrative distance 200 for IPv4 backup. This is correct because a floating static route uses a higher administrative distance than the primary route’s default AD of 1, ensuring it only appears in the routing table when the primary next-hop fails. On the CCNA 200-301 v2 exam, this tests your understanding of administrative distance as a path-selection mechanism and the need to explicitly remove conflicting routes to prevent recursive routing failures. A common trap is forgetting to delete the incorrect IPv6 default route, which would cause a routing loop or suboptimal path. Memory tip: think of AD as a priority score—lower is better, so a floating route with AD 200 is your safety net, not your first choice.

CCNA IP Routing Practice Question

This 200-301 practice question tests your understanding of ip routing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.

Network Topology
G0/010.0.0.1/30G0/010.0.0.2/30linkG0/1198.51.100.1/30G0/1198.51.100.2/30linkG0/2203.0.113.1/30G0/2203.0.113.2/30linkR1R2R3R4

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.

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "primary"

    Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

Question 1hardTroubleshooting
Study the full IPv6 explanation →

Exhibit

R1# show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.0.0.0/30 is directly connected, GigabitEthernet0/0
L        10.0.0.1/32 is directly connected, GigabitEthernet0/0
      198.51.100.0/24 is variably subnetted, 2 subnets, 2 masks
C        198.51.100.0/30 is directly connected, GigabitEthernet0/1
L        198.51.100.1/32 is directly connected, GigabitEthernet0/1
      203.0.113.0/24 is variably subnetted, 2 subnets, 2 masks
C        203.0.113.0/30 is directly connected, GigabitEthernet0/2
L        203.0.113.1/32 is directly connected, GigabitEthernet0/2

R1# show ipv6 route
IPv6 Routing Table - default - 4 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
       IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
       ND - Neighbor Discovery, NDp - Neighbor Discovery prefix
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
C   2001:db8:10:0:0:0:0:0/112 [0/0]
     via GigabitEthernet0/0, directly connected
L   2001:db8:10:0:0:0:0:1/128 [0/0]
     via GigabitEthernet0/0, receive
C   2001:db8:198:51:100:0:0:0/112 [0/0]
     via GigabitEthernet0/1, directly connected
L   2001:db8:198:51:100:0:0:1/128 [0/0]
     via GigabitEthernet0/1, receive
C   2001:db8:203:0:113:0:0:0/112 [0/0]
     via GigabitEthernet0/2, directly connected
L   2001:db8:203:0:113:0:0:1/128 [0/0]
     via GigabitEthernet0/2, receive

R1# show running-config | section ip route
ip route 0.0.0.0 0.0.0.0 203.0.113.2
ip route 0.0.0.0 0.0.0.0 198.51.100.2 200

R1# show running-config | section ipv6 route
ipv6 route ::/0 2001:db8:203:0:113::2

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.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

    Clue confirmation

    The clue word "primary" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    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 is incorrect because the question explicitly requires IPv6 static routes to reach the Internet. Omitting the IPv6 default route means R1 cannot reach IPv6 destinations, failing the requirement.

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?”

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 200-301 question test?

IP Routing — This question tests IP Routing — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: 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.

What should I do if I get this 200-301 question wrong?

Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

Are there clue words in this question I should notice?

Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

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Same concept, more angles

1 more ways this is tested on 200-301

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. You are connected to R1. Configure R1 so that it uses a floating static route to reach the 203.0.113.0/24 network via R2 only when the primary route (learned via EIGRP) fails. The primary route has an administrative distance of 90. Currently, R1 has no route to 203.0.113.0/24 because EIGRP is down on the direct link. Ensure the floating static route is installed and used.

hard
  • ✓ A.ip route 203.0.113.0 255.255.255.0 10.0.0.2 95
  • B.ip route 203.0.113.0 255.255.255.0 10.0.0.2 90
  • C.ip route 203.0.113.0 255.255.255.0 10.0.0.2 85
  • D.ip route 203.0.113.0 255.255.255.0 10.0.0.2

Why A: The issue is that R1 has no route to 203.0.113.0/24 because EIGRP is not working (likely due to misconfiguration or link failure). A floating static route with an administrative distance greater than EIGRP's default AD of 90 is needed. By configuring a static route to 203.0.113.0/24 via next-hop 10.0.0.2 with AD 95, the static route will be used only when EIGRP is down (since 95 > 90, EIGRP is preferred when active). The command 'ip route 203.0.113.0 255.255.255.0 10.0.0.2 95' accomplishes this.

Last reviewed: Jun 6, 2026

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