- A
ipv6 route ::/0 2001:db8:1::2
This command correctly configures a default IPv6 static route. The prefix ::/0 matches all IPv6 destinations, and the next-hop address 2001:db8:1::2 is the interface address of R2. Since R1's internal subnets are directly connected, they are automatically in the routing table, and the default route provides connectivity to all other destinations via R2.
- B
ipv6 route 2001:db8:1::/64 2001:db8:1::2
Why wrong: This command configures a static route for the 2001:db8:1::/64 network, but that network is directly connected to R1's G0/0 interface. A static route for a directly connected network is unnecessary and does not provide a default route for reaching the IPv6 Internet.
- C
ipv6 route ::/0 g0/0
Why wrong: This command attempts to configure a default route using an exit interface (G0/0) instead of a next-hop address. While specifying an exit interface is valid for point-to-point links, G0/0 is a multi-access interface. Without a next-hop address, R1 cannot determine the destination MAC address for packets, causing routing failure.
- D
ipv6 route 2001:db8:1::2/128 g0/0
Why wrong: This command configures a host route (prefix length /128) for the next-hop address itself, pointing to interface G0/0. This does not create a default route; it only tells R1 how to reach the specific address 2001:db8:1::2, which is already reachable via the directly connected network.
Quick Answer
The answer is the command `ipv6 route ::/0 2001:db8:1::2`. This is correct because the IPv6 default static route uses the prefix `::/0`, which matches all destination addresses, and points to the next-hop address `2001:db8:1::2` on R2, enabling hosts on the local subnets to reach any IPv6 Internet destination not found in the routing table. On the CCNA 200-301 v2 exam, this question tests your ability to distinguish between a default route, a network route, and a host route in IPv6, with a common trap being the mistaken belief that an exit interface alone suffices on Ethernet links—IPv6 static routes on multi-access networks require a next-hop IP address. Another frequent error is configuring a static route for the directly connected prefix `2001:db8:1::/64`, which is already present in the routing table and unnecessary. Remember the memory tip: "Double colon, zero prefix, next-hop IP—that’s the default route recipe."
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.
You are connected to R1 via console. R1 is a new router connecting two subnets: 192.168.1.0/24 on G0/0 and 192.168.2.0/24 on G0/1. You need to configure IPv6 static routes so that hosts on these subnets can reach the IPv6 Internet via R2 (2001:db8:1::2). R1's G0/0 has IPv6 address 2001:db8:1::1/64, and R2 is the next-hop. Also configure a default IPv6 route toward R2.
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
ipv6 route ::/0 2001:db8:1::2
A default IPv6 static route with prefix ::/0 points to the next-hop 2001:db8:1::2, which correctly forwards all traffic not in the local routing table to R2 for Internet reachability. Option B is wrong because it creates a static route for the directly connected network 2001:db8:1::/64, which is already in the routing table and unnecessary. Option C fails because on Ethernet interfaces, a static route must specify a next-hop IP address, not just an exit interface. Option D is incorrect because it creates a host route to 2001:db8:1::2, which is a directly connected address, and does not provide a default route.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ipv6 route ::/0 2001:db8:1::2
Why this is correct
This command correctly configures a default IPv6 static route. The prefix ::/0 matches all IPv6 destinations, and the next-hop address 2001:db8:1::2 is the interface address of R2. Since R1's internal subnets are directly connected, they are automatically in the routing table, and the default route provides connectivity to all other destinations via R2.
Related concept
CIDR notation defines the prefix length.
- ✗
ipv6 route 2001:db8:1::/64 2001:db8:1::2
Why it's wrong here
This command configures a static route for the 2001:db8:1::/64 network, but that network is directly connected to R1's G0/0 interface. A static route for a directly connected network is unnecessary and does not provide a default route for reaching the IPv6 Internet.
- ✗
ipv6 route ::/0 g0/0
Why it's wrong here
This command attempts to configure a default route using an exit interface (G0/0) instead of a next-hop address. While specifying an exit interface is valid for point-to-point links, G0/0 is a multi-access interface. Without a next-hop address, R1 cannot determine the destination MAC address for packets, causing routing failure.
- ✗
ipv6 route 2001:db8:1::2/128 g0/0
Why it's wrong here
This command configures a host route (prefix length /128) for the next-hop address itself, pointing to interface G0/0. This does not create a default route; it only tells R1 how to reach the specific address 2001:db8:1::2, which is already reachable via the directly connected network.
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.
✓ipv6 route ::/0 2001:db8:1::2Correct answer▾
Why this is correct
This command correctly configures a default IPv6 static route. The prefix ::/0 matches all IPv6 destinations, and the next-hop address 2001:db8:1::2 is the interface address of R2. Since R1's internal subnets are directly connected, they are automatically in the routing table, and the default route provides connectivity to all other destinations via R2.
✗ipv6 route 2001:db8:1::/64 2001:db8:1::2Wrong answer — click to see why▾
Why this is wrong here
The command specifies a prefix that is already directly connected, so it is redundant. It does not create a default route (::/0) needed for Internet access.
Why candidates choose this
Candidates might think they need to route traffic to the next-hop network explicitly, but directly connected networks are automatically in the routing table.
✗ipv6 route ::/0 g0/0Wrong answer — click to see why▾
Why this is wrong here
On multi-access interfaces like Ethernet, a next-hop IP address must be specified. Using only the exit interface is incorrect for Ethernet links.
Why candidates choose this
Candidates may recall that static routes can use an exit interface, but they forget that this is only appropriate for point-to-point links (e.g., serial) or when the next-hop is implicitly known.
✗ipv6 route 2001:db8:1::2/128 g0/0Wrong answer — click to see why▾
Why this is wrong here
A host route for the next-hop address is unnecessary because the next-hop is on a directly connected subnet. More importantly, it does not provide a default route for other destinations.
Why candidates choose this
Candidates might think they need to define a route to the next-hop before using it, but the next-hop is already reachable via the connected route. They confuse the need for a default route with a route to the next-hop.
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: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
This command configures a static route for the 2001:db8:1::/64 network, but that network is directly connected to R1's G0/0 interface. A static route for a directly connected network is unnecessary and does not provide a default route for reaching the IPv6 Internet.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
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IP Routing — study guide chapter
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FAQ
Questions learners often ask
What does this 200-301 question test?
IP Routing — This question tests IP Routing — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: ipv6 route ::/0 2001:db8:1::2 — A default IPv6 static route with prefix ::/0 points to the next-hop 2001:db8:1::2, which correctly forwards all traffic not in the local routing table to R2 for Internet reachability. Option B is wrong because it creates a static route for the directly connected network 2001:db8:1::/64, which is already in the routing table and unnecessary. Option C fails because on Ethernet interfaces, a static route must specify a next-hop IP address, not just an exit interface. Option D is incorrect because it creates a host route to 2001:db8:1::2, which is a directly connected address, and does not provide a default route.
What should I do if I get this 200-301 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 200-301 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 7, 2026
This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.
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