Cisco 400-251 Valid Dump : CCIE Security Written Exam (v5.0)

400-251 real exams

Exam Code: 400-251

Exam Name: CCIE Security Written Exam (v5.0)

Updated: Sep 10, 2026

Q & A: 125 Questions and Answers

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Every candidate studies differently, so Actual4Exams offers the Cisco CCIE Security Written Exam (v5.0) practice questions in three formats: a printable PDF, a desktop test engine for Windows, and an online test engine that runs in any browser. Pick the format that fits your routine for the 400-251 exam — or use all three together.

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.)
Available Languages:English
Related Certifications:CCNP Security
CCIE Security Lab Exam
Exam Price:USD 400 (approx., varies by region)
Certificate Validity Period:3 years
Passing Score:750/1000 (Cisco scaled scoring)
Exam Duration:120 minutes
Exam Format:Multiple choice, Multiple answer, Drag and drop
Recommended Training:Cisco Official CCIE Security Training
Cisco Press CCIE Security Study Resources
Exam Registration:Cisco Certification Portal
Pearson VUE Exam Registration
Sample Questions:Free Download 400-251 valid dump
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
Content and Endpoint Security- Email and web security
  • 1. Secure web gateways
    - Endpoint protection
    • 1. Antimalware and endpoint detection
      VPN Technologies- Remote access VPN
      • 1. SSL VPN concepts
        - Site-to-site VPN
        • 1. IPsec site-to-site design
          Security Automation and Programmability- Security automation tools
          • 1. API-based security management
            - Infrastructure as code concepts
            • 1. Automation frameworks in security environments
              Network Security- Secure routing and switching
              • 1. L2/L3 security mechanisms
                • 2. Control plane protection
                  - Threat defense
                  • 1. Firewall technologies
                    • 2. IPS/IDS systems
                      Infrastructure Security- Device hardening
                      • 1. Secure device management
                        - Monitoring and logging
                        • 1. Syslog and NetFlow security monitoring
                          Identity and Access Management- AAA services
                          • 1. RADIUS and TACACS+
                            - Network access control
                            • 1. 802.1X authentication
                              Security Concepts and Technologies- Security protocols
                              • 1. SSL/TLS concepts
                                • 2. IPsec fundamentals
                                  - Cryptography fundamentals
                                  • 1. Encryption algorithms (symmetric/asymmetric)
                                    • 2. PKI and digital certificates

                                      400-251 Exam FAQ: What Candidates Ask About Cisco CCIE Security Written Exam (v5.0)

                                      The 400-251 exam, officially known as Cisco CCIE Security Written Exam (v5.0), is the Cisco test that leads to the Cisco Certified Internetwork Expert (CCIE) Security certification at the Expert level. Passing it validates the skills employers expect from a certified professional. It is also associated with related credentials such as CCNP Security, CCIE Security Lab Exam.

                                      The 400-251 exam contains 90-110 (approx.) questions, and you have 120 minutes to complete them. Work out your per-question pace before test day, and flag slow items instead of stalling on them — time pressure, not knowledge, sinks many first attempts. Timed mock exams in the Actual4Exams test engines are the most reliable way to build that rhythm.

                                      The passing score for the 400-251 exam is 750/1000 (Cisco scaled scoring), and the official registration fee is USD 400 (approx., varies by region). If you miss the mark, a retake means paying the full fee again, so book your seat only when you are ready. A practical benchmark: score consistently above the passing line on timed practice tests before scheduling the real exam.

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

                                      You can book the 400-251 exam through the official registration channels below:

                                      Exam delivery: Computer-based exam at Pearson VUE test centers or online proctored exam (where available). Seats at popular test centers fill quickly, so schedule early once your preparation is on track.

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

                                      Pair any course with the 125 practice questions from Actual4Exams to measure how ready you really are before paying the exam fee.

                                      Yes. A free PDF demo of the Cisco CCIE Security Written Exam (v5.0) questions is available, so you can check the question style and answer quality before you pay. Every purchase also includes 365 days of free updates, and if the product expires you can renew the update service at a 50% discount from your member zone.

                                      If you take the corresponding 400-251 exam within 60 days of purchase and do not pass, you can apply for a full refund under the 100% Money Back Guarantee: submit a scan of your enrollment slip and your official Score Report (PDF) within 2 days of the exam date, and the claim is processed within 7 days. Attempts made within 3 days of purchase, downloads without an actual exam attempt, free materials, and expired orders are not eligible, and the candidate name must match the payer name. Prefer new material instead of a refund? You can exchange your purchase for two free products of equal value and keep the update service on your original product. As for delivery, the files are available for instant download and are also emailed to you within one minute of payment — if nothing arrives within 2 hours, contact customer service. There is no limit on how many computers you can install the product on.

                                      The official Cisco CCIE Security Written Exam (v5.0) outline is organized into 7 domains. The first three are:

                                      • Network Security
                                      • VPN Technologies
                                      • Identity and Access Management

                                      See the complete exam topics section above for the full outline and the weighting of every domain.

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

                                      Question 1

                                      Which tool or program is a version control system?

                                      A. Jenkins
                                      B. Logstash
                                      C. Git
                                      D. Travis CI
                                      E. SmartC


                                      Question 2

                                      A device on your internal network is hard-coded with two DNS server on the Internet (1.1.1.53,
                                      2.2.2.53). However, you want to send all requests to your OpenDNS server (208.67.222.222). Which set of commands do you run on the ASA to achieve this goal?

                                      A. Object network OpenDNS
                                      Host 208.67.222.222
                                      !
                                      Object network Rogue1-DNS
                                      Host 1.1.1.53
                                      Object network Rogue2-DNS
                                      Host 2.2.2.53
                                      !
                                      Object-group network Rogue-DNS
                                      Network-object object Rogue1-DNS
                                      Network-object object Rogue2-DNS
                                      !
                                      object service udp-DNS
                                      Service udp destination eq domain
                                      !
                                      object service tcp-DNS
                                      Service tcp destination eq domain
                                      !
                                      nat(inside, outside) source static any interface destination static Rogue-DNS OpenDNS service udp-DNS udp-DNS nat(inside, outside) source static any interface destination static Rogue-DNS OpenDNS service tcp-DNS tcp-DNS
                                      B. Static (inside, outside) source any 208.67.222.222destination 1.1.1.53 eq domain Static (inside, outside) source any 208.67.222.222 destination 2.2.2.53 eq domain
                                      C. nat (inside, outside) source static any interface destination static Rogue-DNS OpenDNS service udp-DNS udp-DNs nat (inside, outside) source static any interface destination static Rogue-DNS OpenDNS service udp-DNS udp-DNS
                                      D. object network OpenDNS
                                      host 1.1.1.53
                                      object network Rogue1-DNS
                                      host 2.2.2.53
                                      !
                                      Object-group network rogue1-DNS
                                      Network-object object Rogue1-DNS
                                      Network-object object Rogue2-DNS
                                      !
                                      Object service udp-DNS
                                      Service udp destination eq domain
                                      !
                                      Object service tcp-DNS
                                      Service tcp destination eq domain
                                      !
                                      Nat (inside, outside) source static any interface destination static OpenDNS Rogue-DNS service udp-DNS udp-DNS Nat (inside, outside) source static any interface destination static OpenDNS Rogue-DNS service tcp-DNS tcp-DNS
                                      E. Net (inside, outside) source any 1.1.1.53 destination 208.67.222.222 eq domain Nat (inside, outside) source any 2.2.2.53 destination 208.67.222.222 eq domain
                                      F. Static (outside, inside) source any 208.67.222.222desination 1.1.1.56 eq domain Static (outside, inside) source any 208.67.222.222 destination 2.2.2.53 eq domain
                                      G. Static (inside, outside) source any destination 208.67.222.222 eq domain
                                      H. Static (inside, outside) source any 1.1.1.53destination 208.61.222.222 eq domain Static (inside, outside) source any 2.2.2.53 destination 208.67.222.222 eq domain


                                      Question 3

                                      Which statement about Remote Triggered Black Hole Filtering feature is true?

                                      A. The Null0 interface used for filtering able to receive the traffic but never forwards it
                                      B. In RTBH filtering, the trigger device is always an ISP edge router
                                      C. It drops malicious traffic at the customer edge router by forwarding it to a Null0 interface
                                      D. IN RTBH filtering, the trigger device redistributes dynamic routes of the eBGP peers
                                      E. It works in conjunction with QoS to drop the traffic that has a lower priority
                                      F. It helps mitigate DDOS attack based only on destination address


                                      Question 4

                                      A customer has configured Cisco ISE to assign a Downloadable Access-List as a result of successful 802.1x authentication. When they check the switch after a successful authentication, they do not see the DACL applied. They also notice that ISE logs do not contain the Framed-IP-Address value from the RAIDUS exchange. What is the most likely fix?

                                      A. Apply a default ACL on the switchport
                                      B. Add the "aaa accounting dot1x default" command on the switch
                                      C. Add source IP address on the DACL in ISE
                                      D. Enable IDPT on the switch


                                      Question 5

                                      A customer has configured a single Policy Set to authenticate and authorize MAB and 802.1x requests on Cisco ISE. The 802.1x authorization rules are on the top of the list and check Active Directory group membership for a match. The MAB results are at the bottom of the list and check local Identity Groups for a match. When a MAB request comes to ISE

                                      A. ISE will ignore the 802.1x authorization rules on the top
                                      B. ISE will try to find the Active Directory group membership based on the MAB request
                                      C. ISE will never match the MAB authorization rules at the bottom
                                      D. ISE will not try to find Active Directory group membership based on the 802.1x request
                                      E. ISE will drop the request because 802.1x and MAB rules are not allowed in the same Policy Set


                                      Solutions:

                                      Question 1
                                      Answer: C
                                      Question 2
                                      Answer: A
                                      Question 3
                                      Answer: F
                                      Question 4
                                      Answer: D
                                      Question 5
                                      Answer: B

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