Cisco 400-251 : CCIE Security Written Exam (v5.0)
Exam Code: 400-251
Exam Name: CCIE Security Written Exam (v5.0)
Updated: Aug 29, 2026
Q & A: 125 Questions and Answers
400-251 Free Demo download
About Cisco 400-251 Exam Free Dumps
The certification may be an important and direct standard to check and assess the value and qualification of one person. So it is not difficult to understand why so many people chase after 400-251 certification. The benefits from Cisco 400-251 certification are very attractive. You may become an important figure from a small staff, and you may get an incredible salary, you may gain much more respect from others. So getting the 400-251 certification seems the most important thing in your current plan. Here, CCIE Security 400-251 practice dumps are the best study material which is suitable for all positive and optimistic people like you.
2. Interactive testing engines for efficiency study
Many people prefer to use the 400-251 test engine for their preparation. As we all know, the exam study and reviewing are a very boring thing, and always make people tired. So when an interesting and interactive Cisco 400-251 study dumps is shown for you, you will be so excited and regain your confidence. Unlike the 400-251 pdf dumps, the questions & answers from the 400-251 test engine can be set for random occurrence. The intelligence and high efficiency of the 400-251 test engine has attracted many people and help them get a happy study experience. Besides, you can get a score after each 400-251 CCIE Security Written Exam (v5.0) simulate test, and the error will be marked, so that you can clearly know your weakness and strength and then make a detail study plan, I believe you can pass your 400-251 actual exam test successfully.
Cisco 400-251 Exam Certification Details:
| Number of Questions | 90-110 |
| Sample Questions | Cisco 400-251 Sample Questions |
| Exam Registration | PEARSON VUE |
| Exam Name | CCIE Security Written Exam |
| Exam Code | 400-251 CCIE S |
| Passing Score | Variable (750-850 / 1000 Approx.) |
| Duration | 120 minutes |
| Exam Price | $450 USD |
Cisco 400-251 Exam Topics:
| Section | Weight Written | Weight Lab | Objectives |
|---|---|---|---|
| Perimeter Security and Intrusion Prevention | 21% | 23% | 1 Describe, implement, and troubleshoot HA features on Cisco ASA and Cisco FirePOWER Threat Defense (FTD) 2 Describe, implement, and troubleshoot clustering on Cisco ASA and Cisco FTD 3 Describe, implement, troubleshoot, and secure routing protocols on Cisco ASA and Cisco FTD 4 Describe, implement, and troubleshoot different deployment modes such as routed, transparent, single, and multicontext on Cisco ASA and Cisco FTD 5 Describe, implement, and troubleshoot firewall features such as NAT (v4,v6), PAT, application inspection, traffic zones, policy-based routing, traffic redirection to service modules, and identity firewall on Cisco ASA and Cisco FTD 6 Describe, implement, and troubleshoot IOS security features such as Zone-Based Firewall (ZBF), application layer inspection, NAT (v4,v6), PAT and TCP intercept on Cisco IOS/IOS-XE 7 Describe, implement, optimize, and troubleshoot policies and rules for traffic control on Cisco ASA, Cisco FirePOWER and Cisco FTD 8 Describe, implement, and troubleshoot Cisco Firepower Management Center (FMC) features such as alerting, logging, and reporting 9 Describe, implement, and troubleshoot correlation and remediation rules on Cisco FMC 10 Describe, implement, and troubleshoot Cisco FirePOWER and Cisco FTD deployment such as in-line, passive, and TAP modes 11 Describe, implement, and troubleshoot Next Generation Firewall (NGFW) features such as SSL inspection, user identity, geolocation, and AVC (Firepower appliance) 12 Describe, detect, and mitigate common types of attacks such as DoS/DDoS, evasion techniques, spoofing, man-in-the-middle, and botnet |
| Infrastructure Security, Virtualization, and Automation | 13% | 15% | 1 Identify common attacks such as Smurf, VLAN hopping, and SYNful knock, and their mitigation techniques 2 Describe, implement, and troubleshoot device hardening techniques and control plane protection methods, such as CoPP and IP Source routing. 3 Describe, implement, and troubleshoot management plane protection techniques such as CPU and memory thresholding and securing device access 4 Describe, implement, and troubleshoot data plane protection techniques such as iACLs, uRPF, QoS, and RTBH 5 Describe, implement, and troubleshoot IPv4/v6 routing protocols security 6 Describe, implement, and troubleshoot Layer 2 security techniques such as DAI, IPDT, STP security, port security, DHCP snooping, and VACL 7 Describe, implement, and troubleshoot wireless security technologies such as WPA, WPA2, TKIP, and AES 8 Describe wireless security concepts such as FLEX Connect, wIPS, ANCHOR, Rogue AP, and Management Frame Protection (MFP) 9 Describe, implement, and troubleshoot monitoring protocols such as NETFLOW/IPFIX, SNMP, SYSLOG, RMON, NSEL, and eSTREAMER 10 Describe the functions and security implications of application protocols such as SSH, TELNET, TFTP, HTTP/HTTPS, SCP, SFTP/FTP, PGP, DNS/DNSSEC, NTP, and DHCP 11 Describe the functions and security implications of network protocols such as VTP, 802.1Q, TCP/UDP, CDP, LACP/PAgP, BGP, EIGRP, OSPF/OSPFv3, RIP/RIPng, IGMP/CGMP, PIM, IPv6, and WCCP 12 Describe the benefits of virtualizing security functions in the data center using ASAv, WSAv, ESAv, and NGIPSv 13 Describe the security principles of ACI such as object models, endpoint groups, policy enforcement, application network profiles, and contracts 14 Describe the northbound and southbound APIs of SDN controllers such as APIC-EM 15 Identify and implement security features to comply with organizational security policies, procedures, and standards such as BCP 38, ISO 27001, RFC 827, and PCI-DSS 16 Describe and identify key threats to different places in the network (campus, data center, core, edge) as described in Cisco SAFE 17 Validate network security design for adherence to Cisco SAFE recommended practices 18 Interpret basic scripts that can retrieve and send data using RESTful API calls in scripting languages such as Python 19 Describe Cisco Digital Network Architecture (DNA) principles and components. |
| Advanced Threat Protection and Content Security | 17% | 19% | 1 Compare and contrast different AMP solutions including public and private cloud deployment models 2 Describe, implement, and troubleshoot AMP for networks, AMP for endpoints, and AMP for content security (CWS, ESA, and WSA) 3 Detect, analyze, and mitigate malware incidents 4 Describe the benefit of threat intelligence provided by AMP Threat GRID 5 Perform packet capture and analysis using Wireshark, tcpdump, SPAN, and RSPAN 6 Describe, implement, and troubleshoot web filtering, user identification, and Application Visibility and Control (AVC) 7 Describe, implement, and troubleshoot mail policies, DLP, email quarantines, and SenderBase on ESA 8 Describe, implement, and troubleshoot SMTP authentication such as SPF and DKIM on ESA 9 Describe, implement, and troubleshoot SMTP encryption on ESA 10 Compare and contrast different LDAP query types on ESA 11 Describe, implement, and troubleshoot WCCP redirection 12 Compare and contrast different proxy methods such as SOCKS, Auto proxy/WPAD, and transparent 13 Describe, implement, and troubleshoot HTTPS decryption and DLP 14 Describe, implement, and troubleshoot CWS connectors on Cisco IOS routers, Cisco ASA, Cisco AnyConnect, and WSA 15 Describe the security benefits of leveraging the OpenDNS solution. 16 Describe, implement, and troubleshoot SMA for centralized content security management 17 Describe the security benefits of leveraging Lancope |
| Secure Connectivity and Segmentation | 17% | 19% | 1 Compare and contrast cryptographic and hash algorithms such as AES, DES, 3DES, ECC, SHA, and MD5 2 Compare and contrast security protocols such as ISAKMP/IKEv1, IKEv2, SSL, TLS/DTLS, ESP, AH, SAP, and MKA 3 Describe, implementc and troubleshoot remote access VPN using technologies such as FLEXVPN, SSL-VPN between Cisco firewalls, routers, and end hosts 4 Describe, implement, and troubleshoot the Cisco IOS CA for VPN authentication 5 Describe, implement, and troubleshoot clientless SSL VPN technologies with DAP and smart tunnels on Cisco ASA and Cisco FTD 6 Describe, implement, and troubleshoot site-to-site VPNs such as GETVPN, DMVPN and IPsec 7 Describe, implement, and troubleshoot uplink and downlink MACsec (802.1AE) 8 Describe, implement, and troubleshoot VPN high availability using Cisco ASA VPN clustering and dual-hub DMVPN deployments 9 Describe the functions and security implications of cryptographic protocols such as AES, DES, 3DES, ECC, SHA, MD5, ISAKMP/IKEv1, IKEv2, SSL, TLS/DTLS, ESP, AH, SAP, MKA, RSA, SCEP/EST, GDOI, X.509, WPA, WPA2, WEP, and TKIP 10 Describe the security benefits of network segmentation and isolation 11 Describe, implement, and troubleshoot VRF-Lite and VRF-Aware VPN 12 Describe, implement, and troubleshoot microsegmentation with TrustSec using SGT and SXP 13 Describe, implement, and troubleshoot infrastructure segmentation methods such as VLAN, PVLAN, and GRE 14 Describe the functionality of Cisco VSG used to secure virtual environments 15 Describe the security benefits of data center segmentation using ACI, EVPN, VXLAN, and NVGRE |
| Identity Management, Information Exchange, and Access Control | 22% | 24% | 1 Describe, implement, and troubleshoot various personas of ISE in a multinode deployment 2 Describe, implement, and troubleshoot network access device (NAD), ISE, and ACS configuration for AAA 3 Describe, implement, and troubleshoot AAA for administrative access to Cisco network devices using ISE and ACS 4 Describe, implement, verify, and troubleshoot AAA for network access with 802.1X and MAB using ISE. 5 Describe, implement, verify, and troubleshoot cut-through proxy/auth-proxy using ISE as the AAA server 6 Describe, implement, verify, and troubleshoot guest life cycle management using ISE and Cisco network infrastructure 7 Describe, implement, verify, and troubleshoot BYOD on-boarding and network access flows with an internal or external CA 8 Describe, implement, verify, and troubleshoot ISE and ACS integration with external identity sources such as LDAP, AD, and external RADIUS 9 Describe ISE and ACS integration with external identity sources such as RADIUS Token, RSA SecurID, and SAML 10 Describe, implement, verify, and troubleshoot provisioning of AnyConnect with ISE and ASA 11 Describe, implement, verify, and troubleshoot posture assessment with ISE 12 Describe, implement, verify, and troubleshoot endpoint profiling using ISE and Cisco network infrastructure including device sensor 13 Describe, implement, verify, and troubleshoot integration of MDM with ISE 14 Describe, implement, verify, and troubleshoot certificate based authentication using ISE 15 Describe, implement, verify, and troubleshoot authentication methods such as EAPChaining and Machine Access Restriction (MAR) 16 Describe the functions and security implications of AAA protocols such as RADIUS, TACACS+, LDAP/LDAPS, EAP (EAP-PEAP, EAP-TLS, EAP-TTLS, EAP-FAST, EAP-TEAP, EAP- MD5, EAP-GTC), PAP, CHAP, and MS-CHAPv2 17 Describe, implement, and troubleshoot identity mapping on ASA, ISE, WSA and FirePOWER 18 Describe, implement, and troubleshoot pxGrid between security devices such as WSA, ISE, and Cisco FMC |
| Evolving Technologies v1.1 | 10% | N/A | 1 Cloud a) Compare and contrast Cloud deployment models a) [i] Infrastructure, platform, and software services (XaaS) a) [ii] Performance and reliability a) [iii] Security and privacy a) [iv] Scalability and interoperability b) Describe Cloud implementations and operations b) [i] Automation and orchestration b) [ii] Workload mobility b) [iii] Troubleshooting and management b) [iv] OpenStack components 2 Network Programmability (SDN) a) Describe functional elements of network programmability (SDN) and how they interact a) [i] Controllers a) [ii] APIs a) [iii] Scripting a) [iv] Agents a) [v] Northbound vs. Southbound protocols b) Describe aspects of virtualization and automation in network environments b) [i] DevOps methodologies, tools and workflows b) [ii] Network/application function virtualization (NFV, AFV) b) [iii] Service function chaining b) [iv] Performance, availability, and scaling considerations 3 Internet of Things (IoT) a) Describe architectural framework and deployment considerations for Internet of Things a) [i] Performance, reliability and scalability a) [ii] Mobility a) [iii] Security and privacy a) [iv] Standards and compliance a) [v] Migration a) [vi] Environmental impacts on the network |
Why choose 400-251 latest pdf dump
1. 400-251 free exam demo is available for all of you.
The questions & answers from 400-251 free exam demo are part of the complete 400-251 exam dumps. So you can take the free demo as a reference and do your assessment. The 400-251 pdf free demo can be free download, so you can have a try, while the soft and online test engine just show the screen shot for you. You can have a basic understanding of the 400-251 actual exam dumps. Besides, all the contents of the three different versions are the same. While, the 400-251 free demo also let you know the different format of these three versions, thus you can easy to decide what version is suitable for you. So no matter you choose 400-251 actual pdf exam or not, you can try our CCIE Security 400-251 free exam demo firstly. I think it is a good thing.
3. 100% guarantee to pass your 400-251 test
400-251 free valid dumps are compiled and edited by IT experts. The questions & answers of 400-251 actual pdf exam are checked every day to see whether it is updated or not. The latest and newest questions will be added into the 400-251 study dumps, while the useless questions will be moved out of the CCIE Security 400-251 practice dumps. Besides, we have set up a working group to catch up the latest and valid IT technology. So the 400-251 latest pdf dump show for you are the best and latest, which can help you face the actual test with more confidence. 400-251 CCIE Security Written Exam (v5.0) test engine can improve your study efficiency and help you 100% pass.
Instant Download: Upon successful payment, Our systems will automatically send the product you have purchased to your mailbox by email. (If not received within 12 hours, please contact us. Note: don't forget to check your spam.)
What Clients Say About Us
Why Choose FreePdfDump
Quality and Value
FreePdfDump Practice Exams are written to the highest standards of technical accuracy, using only certified subject matter experts and published authors for development - no all study materials.
Tested and Approved
We are committed to the process of vendor and third party approvals. We believe professionals and executives alike deserve the confidence of quality coverage these authorizations provide.
Easy to Pass
If you prepare for the exams using our FreePdfDump testing engine, It is easy to succeed for all certifications in the first attempt. You don't have to deal with all dumps or any free torrent / rapidshare all stuff.
Try Before Buy
FreePdfDump offers free demo of each product. You can check out the interface, question quality and usability of our practice exams before you decide to buy.
Our Clients
Choose valid pdf torrent and free download dumps from our site, you will never worry about your exam test, and your technical skills will be improved. Actually, our pdf dumps can ensure you 100% pass the actual exam. You can rely on our study dumps and get success.
Latest PDF Dumps
- GED-Mathematical-Reasoning pdf dumpMay 28, 2022
- NCP-AII pdf dumpMay 28, 2022
- AAIA pdf dumpMay 28, 2022
- SK0-005 pdf dumpMay 28, 2022
Contact Us
From Monday to Saturday
Support: Contact now
If you have any question please leave me your email address, we will reply and send email to you in 12 hours.
Copyright © 2026 FreePdfDump NETWORK CO.,LIMITED. All Rights Reserved. All trademarks used are properties of their respective owners. Privacy Policy