Cisco 400-251 Actual PDF : CCIE Security Written Exam (v5.0)

Cisco 400-251 Actual PDF
  • Exam Code: 400-251
  • Exam Name: CCIE Security Written Exam (v5.0)
  • Updated: Sep 15, 2026
  • Q & A: 125 Questions and Answers
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About Cisco 400-251 Actual Exam

Version currency is printed right on the product: ActualPDF staff check the Cisco CCIE Security Written Exam (v5.0) collection daily, and your 2026 purchase includes 365 days of free updates to the 125 400-251 practice questions.

Cisco 400-251 Exam Overview:

Certification Vendor:Cisco
Exam Name:CCIE Security Written Exam (SCOR v5.0)
Exam Number:400-251
Real Exam Qty:90-110 (approx.)
Exam Format:Multiple choice, Drag and drop, Multiple answer
Exam Duration:120 minutes
Available Languages:English
Related Certifications:CCIE Security Lab Exam
CCNP Security
Certificate Validity Period:3 years
Passing Score:750/1000 (Cisco scaled scoring)
Exam Price:USD 400 (approx., varies by region)
Recommended Training:Cisco Press CCIE Security Study Resources
Cisco Official CCIE Security Training
Exam Registration:Cisco Certification Portal
Pearson VUE Exam Registration
Sample Questions:Free Download Pass 400-251 Exam Cram
Exam Way:Computer-based exam at Pearson VUE test centers or online proctored exam (where available)
Pre Condition:No formal prerequisites for the written exam, but CCNP Security level knowledge is strongly recommended before attempting CCIE Security certification track.

Cisco 400-251 Exam Syllabus Topics:

SectionObjectives
Topic 1: Security Automation and Programmability- Infrastructure as code concepts
  • 1. Automation frameworks in security environments
    - Security automation tools
    • 1. API-based security management
      Topic 2: Network Security- Threat defense
      • 1. Firewall technologies
        • 2. IPS/IDS systems
          - Secure routing and switching
          • 1. Control plane protection
            • 2. L2/L3 security mechanisms
              Topic 3: Security Concepts and Technologies- Security protocols
              • 1. SSL/TLS concepts
                • 2. IPsec fundamentals
                  - Cryptography fundamentals
                  • 1. PKI and digital certificates
                    • 2. Encryption algorithms (symmetric/asymmetric)
                      Topic 4: VPN Technologies- Site-to-site VPN
                      • 1. IPsec site-to-site design
                        - Remote access VPN
                        • 1. SSL VPN concepts
                          Topic 5: Infrastructure Security- Device hardening
                          • 1. Secure device management
                            - Monitoring and logging
                            • 1. Syslog and NetFlow security monitoring
                              Topic 6: Identity and Access Management- AAA services
                              • 1. RADIUS and TACACS+
                                - Network access control
                                • 1. 802.1X authentication
                                  Topic 7: Content and Endpoint Security- Email and web security
                                  • 1. Secure web gateways
                                    - Endpoint protection
                                    • 1. Antimalware and endpoint detection

                                      400-251 Exam FAQ: Before You Book Your Seat

                                      Cisco CCIE Security Written Exam (v5.0) is an official Cisco exam, listed under exam code 400-251. A passing result earns you the Cisco Certified Internetwork Expert (CCIE) Security certification at the Expert level. It also ties into CCNP Security, CCIE Security Lab Exam, extending its value across your certification roadmap. Employers read this credential as verified competence, which is why it keeps appearing in job requirements.

                                      Expect 90-110 (approx.) questions inside 120 minutes on the Cisco CCIE Security Written Exam (v5.0) exam. That pace punishes hesitation, so rehearse it: the ActualPDF software engine simulates the real exam scene, reminds you of the questions you got wrong, and pushes you to re-practice them until the clock stops being your enemy.

                                      Passing Cisco CCIE Security Written Exam (v5.0) requires 750/1000 (Cisco scaled scoring), and the official registration fee is USD 400 (approx., varies by region). Retakes charge the full USD 400 (approx., varies by region) again, which is why experienced candidates treat preparation as the cheaper exam fee. Verify your readiness with repeated ActualPDF practice scores above the requirement before you commit to a date.

                                      No formal prerequisites for the written exam, but CCNP Security level knowledge is strongly recommended before attempting CCIE Security certification track.

                                      Requirements evolve, so confirm the current conditions before registering.

                                      Registration for Cisco CCIE Security Written Exam (v5.0) goes through the official channels listed here.

                                      When you schedule, note that the exam is delivered Computer-based exam at Pearson VUE test centers or online proctored exam (where available).

                                      Cisco recommends the following training for Cisco CCIE Security Written Exam (v5.0) candidates.

                                      Follow any course with the 125 practice questions in the ActualPDF 400-251 package; the software engine will even remind you which mistakes need another round.

                                      Yes. ActualPDF provides a free download demo of the Cisco CCIE Security Written Exam (v5.0) material, so you can check the content before choosing a version. After purchase, a one-year warranty covers you: the latest version is sent to you as it releases, free for 365 days, and after expiry you can extend the update service at a 50% discount.

                                      Your purchase is covered by a 100% money-back guarantee with clear conditions. Take the Cisco CCIE Security Written Exam (v5.0) exam within 60 days of purchase; if you fail, provide your unqualified result by submitting a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and the full refund is processed within 7 days. The exam must match your product, candidate and payer names must match, and attempts within 3 days of purchase, unused downloads, free materials, and expired orders are not covered. Alternatively, exchange for two other exam products of equal value, free, or wait for updates while keeping your original product's update service.

                                      Delivery is instant: files unlock for download at payment and are emailed within one minute. If nothing arrives within 2 hours, check spam and contact customer service, which works 7/24 and normally replies within two hours. Installation is unlimited across your computers.

                                      The Cisco CCIE Security Written Exam (v5.0) syllabus spans 7 domains, led by Network Security, Content and Endpoint Security, and Security Automation and Programmability. The complete topic list is published above; candidates who study the map first rarely get lost later.

                                      Cisco CCIE Security Written Exam (v5.0) Sample Questions:

                                      Question #1

                                      In your Corporate environment, you have various Active Directory groups based o the organizational structure and would like to ensure that users are only able to access certain resources depending on which groups(s) they belong to.This policy should apply across the network. You have ISE, ASA and WSA deployed, and would like to ensure the appropriate policies are present to ensure access is only based on the user's group membership. Addionally, you don't want the user to authenticate multiple times to get access. Which two ploicies are used to set this up? (Choose two)

                                      • A. Deploy ISE, intergrate it with Active Directory, and based on group membership authirize the user to specific VLANs. These VLANs. These VLANs (with specific subnets) should then be used in access policies on the ASA as well as the WSA.
                                      • B. Deploy Cisco TrustSec Infrastructure, with ASA and WSA integrated with the ISE to transparently identity user based on SGT assignment. when the user authenticates to the network. The SGTs can then be used in access policies
                                      • C. Configure ISE to relay learned SGTs for the authenticates sessions with the binded destination address using SXP ro SXp speakers that will be used to apply access policies at the traffic ingress point for segmentation
                                      • D. Integrate ISE, ASA and WSA with Active Directory. Once user is authenticated to the network through ISE, the ASSA and WSA will automatically extract the identity information from AD to apply the appropriate access policies.
                                      • E. Configure ISE as an SSO Service Provider, and integrate with ASA and WSA using pxGrid. ASA and WSA will be able to extract the relevant identity information from ISE to apply to the access policies once the user has authenticated to the network.
                                      • F. Deploy a Single Sign-On Infrastructure such as Ping, and Integrate ISE, ASA and WSA with it. Access policies will be applied based on the user's group membership retrieved from the authentication Infrastructure.
                                      Reveal Solution  Discussion  0

                                      Correct Answer: B,F  🗳️

                                      Question #2

                                      Which requirement for the FTD high availability setup is true?

                                      • A. Units must have DHCP configured for the interfaces
                                      • B. Units must be configured in transparent mode
                                      • C. Units must be synchronized using the same NTP source.
                                      • D. Units can have any uncommitted changes on FMC and need not be fully deployed
                                      • E. Units must not have the same major, minor, and maintenance software version running on them
                                      • F. Units must be in different domains in FMC
                                      • G. Units must be configured in routed mode
                                      Reveal Solution  Discussion  0

                                      Correct Answer: C  🗳️

                                      Question #3

                                      Which three of the following cryptographic algorithms meet the Next Generation Encryption (NGE) requirements for future-proof security and scalability? (Choose three)

                                      • A. RSA 2048 for encryption
                                      • B. SHA-256 for data integrity
                                      • C. 3DES for encryption
                                      • D. DH-2048 for key exchange
                                      • E. AES 128 in GCM mode for encryption and authentication
                                      • F. ECDH-384 for key exchange
                                      Reveal Solution  Discussion  0

                                      Correct Answer: B,E,F  🗳️

                                      Question #4

                                      Which statement is true regarding the failover link when ASAs are configured in a failover mode?

                                      • A. The information sent over the failover link can only be sent as a secured communication
                                      • B. The information sent over the failover link cannot be in clear text but it could be secured communication using a failover key
                                      • C. Failover key is not required for the secure communication over the failover link
                                      • D. It is not recommended to use secure communication over failover link when ASA terminating the VPN tunnel.
                                      • E. The information sent over the failover link cannot be in clear text
                                      • F. Configuration replication sent across the link can be secured using a failover key
                                      Reveal Solution  Discussion  0

                                      Correct Answer: F  🗳️

                                      Question #5

                                      Which three protocols are used by the management plane in a Cisco IOS device? (Choose three)

                                      • A. HTTPS
                                      • B. RIP
                                      • C. Telnet
                                      • D. TLS
                                      • E. SSH
                                      • F. DHCP
                                      • G. 3DES
                                      • H. CHAP
                                      • I. PAP
                                      Reveal Solution  Discussion  0

                                      Correct Answer: A,C,E  🗳️

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