An engineer is configuring a site-to-site IPsec VPN between two routers, both using certificates from the same Cisco IOS CA. The VPN fails to establish, and the logs show 'certificate validation failed'. The certificates were enrolled successfully. What should the engineer check first?

Confirm that the routers have the same hostname.

Ensure both routers have the CA certificate and that the peer certificates are not expired.

Verify that the IPsec transform set matches on both sides.

Check that the ISAKMP policy uses the same encryption algorithm.

A VPN peer successfully enrolls with a Cisco IOS CA via SCEP, but when it tries to establish an IPsec tunnel, the gateway rejects the certificate. The gateway's log shows 'certificate not yet valid'. What is the most likely cause?

The peer's clock is set in the future relative to the CA.

The certificate was revoked by the CA.

The CA's certificate is expired.

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

A company wants to use a Cisco IOS router as a CA for its VPN. The router is already configured with a hostname and domain name. The engineer enables the CA server and generates a CA certificate. However, when a peer tries to enroll, it receives an error that the CA certificate is not trusted. What is the missing configuration?

The peer must generate an RSA key pair before enrollment.

The peer must have the CA certificate installed in its trust store.

The CA server must be configured to use a stronger encryption algorithm.

The CA server must be configured with a CRL distribution point.

An IPsec VPN is configured to use certificates for authentication. The VPN gateway is supposed to accept connections only from peers whose certificates contain a specific organizational unit (OU) in the subject. How should the engineer configure the gateway to enforce this?

Configure the CA to issue certificates only with that OU.

Use a CRL to filter certificates by OU.

Set the ISAKMP policy to require a specific pre-shared key.

Use a certificate map to match the OU in the subject and apply it to the ISAKMP profile.

A Cisco IOS CA is used for VPN authentication. The administrator wants to ensure that revoked certificates are quickly rejected by VPN gateways. The CA supports both CRL and OCSP. Which configuration should be used to minimize the time between revocation and enforcement?

Configure the VPN gateways to use CRL with a short cache lifetime.

Configure the VPN gateways to use OCSP instead of CRL.

Manually distribute the CRL to each gateway after each revocation.

Disable CRL checking to avoid delays.

CCIE Security

Domain 2Objective 2

2.2 Cisco IOS CA for VPN Authentication CCIE-SECURITY Practice Questions (Page 6)

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 26–30

26application · medium
An engineer is configuring a site-to-site IPsec VPN between two routers, both using certificates from the same Cisco IOS CA. The VPN fails to establish, and the logs show 'certificate validation failed'. The certificates were enrolled successfully. What should the engineer check first?
Select an answer first
27application · medium
A VPN peer successfully enrolls with a Cisco IOS CA via SCEP, but when it tries to establish an IPsec tunnel, the gateway rejects the certificate. The gateway's log shows 'certificate not yet valid'. What is the most likely cause?
Select an answer first
28application · medium
A company wants to use a Cisco IOS router as a CA for its VPN. The router is already configured with a hostname and domain name. The engineer enables the CA server and generates a CA certificate. However, when a peer tries to enroll, it receives an error that the CA certificate is not trusted. What is the missing configuration?
Select an answer first
29application · medium
An IPsec VPN is configured to use certificates for authentication. The VPN gateway is supposed to accept connections only from peers whose certificates contain a specific organizational unit (OU) in the subject. How should the engineer configure the gateway to enforce this?
Select an answer first
30application · medium
A Cisco IOS CA is used for VPN authentication. The administrator wants to ensure that revoked certificates are quickly rejected by VPN gateways. The CA supports both CRL and OCSP. Which configuration should be used to minimize the time between revocation and enforcement?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to CCIE-SECURITY

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Cisco. “CCIE-SECURITY” is a trademark of its owner, used for identification only.