An engineer is configuring a remote-access VPN on a Cisco ASA (which uses similar certificate concepts) with certificates from a Cisco IOS CA. The VPN works for most users, but one user's certificate is rejected. The user's certificate was enrolled correctly and is not expired. The CA's CRL is accessible. What is the most likely reason for this specific user's failure?

The user's certificate was revoked, but the CRL is not being checked.

The user's certificate was issued by a different CA.

The user's VPN client is using the wrong certificate.

The user's certificate has a subject that does not match the certificate map configured on the VPN gateway.

A VPN gateway is configured to use CRL checking, but the CRL is hosted on a server that is occasionally unreachable. The administrator wants to ensure that VPN connections are not disrupted when the CRL server is down. What is the best configuration?

Use a static CRL file that is manually updated.

Disable CRL checking to avoid disruptions.

Configure the gateway to use OCSP as a fallback when the CRL is unreachable.

Set the CRL cache lifetime to a very long value.

A Cisco IOS CA is configured, and a VPN peer is attempting to enroll via SCEP. The peer sends a certificate request, but the CA does not issue a certificate. The CA's log shows 'enrollment request rejected'. What is the most likely cause?

The peer's key pair is too small.

The peer's hostname is not resolvable.

The CA's certificate has expired.

The CA is configured to require manual approval of enrollment requests.

A security architect is designing a VPN solution using a Cisco IOS CA. The company requires that all VPN peers be authenticated using certificates, and that the CA be highly available. Which design is most appropriate?

Use a single Cisco IOS router as the CA and rely on its high availability features.

Use two Cisco IOS routers as CAs with the same CA certificate and private key, and load-balance enrollment requests.

Use a third-party CA and import its certificate into the VPN gateways.

Use the VPN gateway itself as the CA to reduce hardware.

A VPN peer is unable to establish an IPsec tunnel using certificates. The peer's certificate is valid and trusted, but the gateway's log shows 'no suitable certificate found'. What is the most likely cause?

The gateway does not have a certificate of its own to present during IKE negotiation.

The peer's certificate is not signed by the CA.

The peer's certificate is revoked.

The gateway's certificate map is too restrictive.

CCIE Security

Domain 2Objective 2

2.2 Cisco IOS CA for VPN Authentication CCIE-SECURITY Practice Questions (Page 4)

Part of the 2.0 Secure Connectivity and Segmentation domain, which accounts for 20% of the CCIE-SECURITY exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~10–16 in this domain), expect 2–3 from this objective — we provide 49 practice questions to prepare you well beyond it. (estimate)

49questions here

10free pages

6concepts

20%of the exam

Questions 16–20

16expert · hard
An engineer is configuring a remote-access VPN on a Cisco ASA (which uses similar certificate concepts) with certificates from a Cisco IOS CA. The VPN works for most users, but one user's certificate is rejected. The user's certificate was enrolled correctly and is not expired. The CA's CRL is accessible. What is the most likely reason for this specific user's failure?
Select an answer first
17expert · hard
A VPN gateway is configured to use CRL checking, but the CRL is hosted on a server that is occasionally unreachable. The administrator wants to ensure that VPN connections are not disrupted when the CRL server is down. What is the best configuration?
Select an answer first
18expert · hard
A Cisco IOS CA is configured, and a VPN peer is attempting to enroll via SCEP. The peer sends a certificate request, but the CA does not issue a certificate. The CA's log shows 'enrollment request rejected'. What is the most likely cause?
Select an answer first
19expert · hard
A security architect is designing a VPN solution using a Cisco IOS CA. The company requires that all VPN peers be authenticated using certificates, and that the CA be highly available. Which design is most appropriate?
Select an answer first
20expert · hard
A VPN peer is unable to establish an IPsec tunnel using certificates. The peer's certificate is valid and trusted, but the gateway's log shows 'no suitable certificate found'. What is the most likely cause?
Select an answer first

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