Question 1,302 of 2,152

VRF-Lite →hardMultiple SelectObjective-mapped

Quick Answer

The correct choices are that the static route must specify the source VRF using the 'vrf' keyword, and the next-hop IP address must be reachable in the source VRF (VRF A). This is because inter-VRF route leaking with static routes works by configuring a static route in the destination VRF (VRF B) that points to a next-hop located in the source VRF, and the 'vrf' keyword tells the router to look up that next-hop within the specified source VRF rather than the global table. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of VRF-Lite and how to leak routes without a dynamic protocol—a common trap is confusing the 'vrf' keyword with a nonexistent 'source-vrf' parameter, or thinking the next-hop must be in the destination VRF. Remember the memory tip: "Leak to B, point to A—use the 'vrf' keyword to show the way."

300-410 VRF-Lite Practice Question

This 300-410 practice question tests your understanding of vrf-lite. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.

Which TWO configuration changes are required to enable inter-VRF route leaking between VRF A and VRF B using static routes? (Choose TWO.)

Question 1hardmulti select

Read the full VRF explanation →

A
Configure a static route in VRF B with the 'vrf A' keyword to specify the source VRF for the next-hop.
Correct. Example: 'ip route vrf B 10.1.2.0 255.255.255.0 10.1.1.1 vrf A' leaks the route from VRF A to VRF B.
B
Use the 'ip route vrf B <prefix> <mask> <next-hop> source-vrf A' command syntax.
Why wrong: Incorrect. The correct syntax uses 'vrf' twice: 'ip route vrf B <prefix> <mask> <next-hop> vrf A'. There is no 'source-vrf' keyword.
C
The next-hop IP address must be the interface address of the destination VRF.
Why wrong: Incorrect. The next-hop must be an address in the source VRF (the VRF from which the route is leaked).
D
The next-hop IP address must be reachable in the source VRF (VRF A).
Correct. The next-hop must be a valid address in the source VRF, reachable via the source VRF's routing table.
E
A dynamic routing protocol must be configured in both VRFs to redistribute the leaked routes.
Why wrong: Incorrect. Route leaking with static routes does not require a routing protocol; the static route directly installs the route.

Full breakdown with real-world context →

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

✓

Configure a static route in VRF B with the 'vrf A' keyword to specify the source VRF for the next-hop.

Route leaking between VRFs can be done using static routes with the 'global' or 'vrf' keywords. To leak a route from VRF A to VRF B, you configure a static route in VRF B pointing to the next-hop in VRF A, and use the 'vrf' keyword to specify the source VRF. Option A is correct because the static route must specify the source VRF. Option D is correct because the next-hop must be reachable in the source VRF. Option B is incorrect because the 'ip route' command does not use 'source-vrf'; it uses 'vrf'. Option C is incorrect because the destination network is the one being leaked, not the next-hop. Option E is incorrect because route leaking does not require a routing protocol; static routes are sufficient.

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.

✓
Configure a static route in VRF B with the 'vrf A' keyword to specify the source VRF for the next-hop.
Why this is correct
Correct. Example: 'ip route vrf B 10.1.2.0 255.255.255.0 10.1.1.1 vrf A' leaks the route from VRF A to VRF B.
Related concept
CIDR notation defines the prefix length.
✗
Use the 'ip route vrf B <prefix> <mask> <next-hop> source-vrf A' command syntax.
Why it's wrong here
Incorrect. The correct syntax uses 'vrf' twice: 'ip route vrf B <prefix> <mask> <next-hop> vrf A'. There is no 'source-vrf' keyword.
✗
The next-hop IP address must be the interface address of the destination VRF.
Why it's wrong here
Incorrect. The next-hop must be an address in the source VRF (the VRF from which the route is leaked).
✓
The next-hop IP address must be reachable in the source VRF (VRF A).
Why this is correct
Correct. The next-hop must be a valid address in the source VRF, reachable via the source VRF's routing table.
Related concept
CIDR notation defines the prefix length.
✗
A dynamic routing protocol must be configured in both VRFs to redistribute the leaked routes.
Why it's wrong here
Incorrect. Route leaking with static routes does not require a routing protocol; the static route directly installs the route.

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

Keyword trap
Incorrect. The correct syntax uses 'vrf' twice: 'ip route vrf B <prefix> <mask> <next-hop> vrf A'. There is no 'source-vrf' keyword.

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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

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 300-410 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this 300-410 question test?

VRF-Lite — This question tests VRF-Lite — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Configure a static route in VRF B with the 'vrf A' keyword to specify the source VRF for the next-hop. — Route leaking between VRFs can be done using static routes with the 'global' or 'vrf' keywords. To leak a route from VRF A to VRF B, you configure a static route in VRF B pointing to the next-hop in VRF A, and use the 'vrf' keyword to specify the source VRF. Option A is correct because the static route must specify the source VRF. Option D is correct because the next-hop must be reachable in the source VRF. Option B is incorrect because the 'ip route' command does not use 'source-vrf'; it uses 'vrf'. Option C is incorrect because the destination network is the one being leaked, not the next-hop. Option E is incorrect because route leaking does not require a routing protocol; static routes are sufficient.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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