Question 1,005 of 2,152

Route Maps and Route Filtering →hardMultiple ChoiceObjective-mapped

300-410 Route Maps and Route Filtering Practice Question

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.

An engineer configures IPsec site-to-site VPN with a route map that defines interesting traffic using an extended access list. The VPN tunnel is established, but traffic from the local LAN to the remote LAN is not encrypted. The engineer verifies that the access list matches the traffic correctly. Which is the most likely explanation?

Clue words in this question

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

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps.
Crypto maps only support access lists for interesting traffic; route maps are not valid.
B
The crypto map is applied to the wrong interface; it should be applied to the LAN interface.
Why wrong: Crypto maps are applied to the outgoing interface (tunnel or WAN).
C
The IPsec transform set is missing the ESP protocol.
Why wrong: Transform set mismatch would prevent tunnel establishment, not encryption.
D
The route map uses a prefix-list instead of an access list.
Why wrong: Prefix-lists are also not supported; only access lists.

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

✓

The route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps.

In IPsec, the crypto map applies to the interface, and the access list defines interesting traffic. However, if the route map is applied to the crypto map, it is not used for interesting traffic; route maps are not supported for defining interesting traffic in crypto maps. The correct method is to use an access list directly in the crypto map. The edge case is that the engineer mistakenly used a route map instead of an access list.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps.
Why this is correct
Crypto maps only support access lists for interesting traffic; route maps are not valid.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The crypto map is applied to the wrong interface; it should be applied to the LAN interface.
Why it's wrong here
Crypto maps are applied to the outgoing interface (tunnel or WAN).
✗
The IPsec transform set is missing the ESP protocol.
Why it's wrong here
Transform set mismatch would prevent tunnel establishment, not encryption.
✗
The route map uses a prefix-list instead of an access list.
Why it's wrong here
Prefix-lists are also not supported; only access lists.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A practitioner preparing for the 300-410 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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

Visual reference

Quick reference

VPN Protocol Comparison

Protocol	Port	Encryption	Authentication	Use Case
IKEv2 / IPsec	UDP 500 / 4500	AES-256	Certificates / PSK	Site-to-site & remote access
SSL / TLS VPN	TCP 443	TLS 1.3	Certificates / MFA	Clientless remote access
L2TP / IPsec	UDP 1701	AES (IPsec)	PSK / Certificates	Legacy remote access
WireGuard	UDP 51820	ChaCha20	Public keys	Modern high-performance VPN
PPTP	TCP 1723	MPPE (weak)	MS-CHAPv2	Legacy — avoid in production

PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.

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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 — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The route map must be applied to the crypto map using the 'match ip address' command, but route maps are not supported for crypto maps. — In IPsec, the crypto map applies to the interface, and the access list defines interesting traffic. However, if the route map is applied to the crypto map, it is not used for interesting traffic; route maps are not supported for defining interesting traffic in crypto maps. The correct method is to use an access list directly in the crypto map. The edge case is that the engineer mistakenly used a route map instead of an access list.

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Standard ACLs match source addresses.

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