Question 1,849 of 2,152

Route Maps and Route Filtering →hardMultiple SelectObjective-mapped

300-410 Route Maps and Route Filtering Practice Question

Q: How is Route Maps and Route Filtering tested on the 300-410 exam?

Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — CIDR notation defines the prefix length..

Q: What is the correct answer to this Route Maps and Route Filtering 300-410 question?

The correct answer is: A prefix-list entry with "ge 24" matches any prefix with a subnet mask greater than or equal to 24 bits. — Prefix-lists can match on prefix length and subnet mask using ge and le operators. A prefix-list entry can be configured to permit or deny. When used in a route-map, the match ip address prefix-list command references the prefix-list. If the prefix-list denies, the route-map clause is not matched, and the route falls to the next clause. The prefix-list can also be used directly in a distribute-list without a route-map.

Q: Why do candidates get Route Maps and Route Filtering questions wrong on the 300-410 exam?

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.

This 300-410 practice question tests your understanding of route maps and route filtering. 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 statements about using prefix-lists in conjunction with route-maps for filtering IPv4 routes are true? (Choose TWO.)

Question 1hardmulti select

Review the full routing breakdown →

A
A prefix-list entry with "ge 24" matches any prefix with a subnet mask greater than or equal to 24 bits.
Correct. The ge (greater or equal) operator matches prefixes with a mask length >= the specified value.
B
A route-map with a match ip address prefix-list command will process the route only if the prefix-list permits the route.
Correct. The match is successful only if the prefix-list has a permit entry that matches the route.
C
A prefix-list can be used directly in a route-map without a match command.
Why wrong: Incorrect. A route-map requires a match command to reference a prefix-list; the prefix-list cannot be called directly.
D
The le operator in a prefix-list matches prefixes with a mask length less than the specified value.
Why wrong: Incorrect. The le (less or equal) operator matches prefixes with a mask length <= the specified value, not less than.
E
A prefix-list can only be used with route-maps, not with distribute-lists.
Why wrong: Incorrect. Prefix-lists can be used with distribute-lists directly (e.g., distribute-list prefix-list name in).

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

✓

A prefix-list entry with "ge 24" matches any prefix with a subnet mask greater than or equal to 24 bits.

Prefix-lists can match on prefix length and subnet mask using ge and le operators. A prefix-list entry can be configured to permit or deny. When used in a route-map, the match ip address prefix-list command references the prefix-list. If the prefix-list denies, the route-map clause is not matched, and the route falls to the next clause. The prefix-list can also be used directly in a distribute-list without a route-map.

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.

✓
A prefix-list entry with "ge 24" matches any prefix with a subnet mask greater than or equal to 24 bits.
Why this is correct
Correct. The ge (greater or equal) operator matches prefixes with a mask length >= the specified value.
Related concept
CIDR notation defines the prefix length.
✓
A route-map with a match ip address prefix-list command will process the route only if the prefix-list permits the route.
Why this is correct
Correct. The match is successful only if the prefix-list has a permit entry that matches the route.
Related concept
CIDR notation defines the prefix length.
✗
A prefix-list can be used directly in a route-map without a match command.
Why it's wrong here
Incorrect. A route-map requires a match command to reference a prefix-list; the prefix-list cannot be called directly.
✗
The le operator in a prefix-list matches prefixes with a mask length less than the specified value.
Why it's wrong here
Incorrect. The le (less or equal) operator matches prefixes with a mask length <= the specified value, not less than.
✗
A prefix-list can only be used with route-maps, not with distribute-lists.
Why it's wrong here
Incorrect. Prefix-lists can be used with distribute-lists directly (e.g., distribute-list prefix-list name in).

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
Incorrect. A route-map requires a match command to reference a prefix-list; the prefix-list cannot be called directly.

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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

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?

Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: A prefix-list entry with "ge 24" matches any prefix with a subnet mask greater than or equal to 24 bits. — Prefix-lists can match on prefix length and subnet mask using ge and le operators. A prefix-list entry can be configured to permit or deny. When used in a route-map, the match ip address prefix-list command references the prefix-list. If the prefix-list denies, the route-map clause is not matched, and the route falls to the next clause. The prefix-list can also be used directly in a distribute-list without a route-map.

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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