Cisco 400-251 Q&A - in .pdf

Exam Code: 400-251
Exam Name: CCIE Security Written Exam (v5.0)
Updated: Jun 15, 2026
Q & A: 125 Questions and Answers
Convenient, easy to study.
Printable Cisco 400-251 PDF Format. It is an electronic file format regardless of the operating system platform.
100% Money Back Guarantee.
PDF Price: $59.99
Free Demo

Cisco 400-251 Value Pack
(Actual Exam Collection)

Exam Code: 400-251
Exam Name: CCIE Security Written Exam (v5.0)
Online Testing Engine supports Windows / Mac / Android / iOS, etc., because it is the software based on WEB browser.
If you purchase Cisco 400-251 Value Pack, you will also own the free online Testing Engine.
Updated: Jun 15, 2026
Q & A: 125 Questions and Answers
400-251 PDF + PC Testing Engine + Online Testing Engine
Value Pack Total: $119.98 $79.99
Save 50%

Cisco 400-251 Q&A - Testing Engine

Exam Code: 400-251
Exam Name: CCIE Security Written Exam (v5.0)
Updated: Jun 15, 2026
Q & A: 125 Questions and Answers
Uses the World Class 400-251 Testing Engine.
Free updates for one year.
Real 400-251 exam questions with answers.
Install on multiple computers for self-paced, at-your-convenience training.
Testing Engine Price: $59.99
Testing Engine

Cisco 400-251 Exam Certification Details:

Exam Code	400-251 CCIE S
Number of Questions	90-110
Exam Registration	PEARSON VUE
Exam Name	CCIE Security Written Exam
Duration	120 minutes
Exam Price	$450 USD
Passing Score	Variable (750-850 / 1000 Approx.)
Sample Questions	Cisco 400-251 Sample Questions

Three different versions for easy pass

Many candidates usually don't have abundant time. Some of them are too busy to prepare for the exam. Our accurate 400-251 Dumps collection can help you pass the exam quickly and save a lot of time so candidates will benefit a lot in short term. Our accurate 400-251 Dumps collection has three different formats.
PDF Version: It's easy to read and print, and candidates can rely on printed accurate 400-251 Dumps collection to review when they're not convenient to use electronic products, and it's easy to take notes;
SOFT (PC Test Engine) Version: It simulates the Cisco 400-251 Troytec real test environment, greatly helps candidates adapt the exam mode. There is no limit about the number of installed computer, but 400-251 PC Test Engine format can only run on the Windows operating system;
APP (Online Test Engine) Version of accurate 400-251 Dumps collection: Electronic equipment is not limited which supports any electronic equipment like mobile phone or E-Book. 400-251 online test engine can be used offline as long as you have downloaded it when your equipment is connected to the network at the first time. Our accurate 400-251 Dumps collection is closely linked to the content of actual examination, keeps up with the latest information. You can get a good result easily after 20 to 30 hours study and preparation of our 400-251 Dumps collection software.

In the modern era of rapid development of this industry, the requirements for Cisco employees are increasing day by day. Passing Cisco 400-251 Troytec exam would be helpful to your career. Serves as a leader in this industry, our company provides the best service and high-quality 400-251 Dumps collection which can help our candidates pass the exam quickly. We can ensure that our 400-251 examination database is the most latest, our Cisco experts will check for the updates everyday, so you don't need to worry the quality of our accurate 400-251 Dumps collection. The system will send our candidates the 400-251 latest database automatically if there is any update. By the way, the time limit is one year after purchase. Another advantage of our accurate 400-251 Dumps collection is allowing candidates to apply for full refund if you fail the exam. You can get a full refund or change another 400-251 examination dumps freely as long as you provide your failed transcript, so you don't need to waste money to buy another review material even you fail the exam.

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
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
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
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.
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

Reference: http://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/400-251-ccie-security.html

Free Demo

There are so many learning materials and related products in the market, choosing a suitable product is beneficial for you to pass the Cisco 400-251 Troytec exam smoothly. Our accurate 400-251 Dumps collection offers free demo. Customers can download the demon freely, experience our accurate 400-251 Dumps collection, and then decide to buy it or not.

High-efficiency Service

We provide 24/7 (24 hours 7 days) online customers service. You can email us or contact our customer service staff online if you have any questions in the process of purchasing or using accurate 400-251 Dumps collection. Our staff will reply you as soon as possible and answer your doubts, help you pass the Cisco 400-251 Troytec exam successfully.

Instant Download: Our system will send you the TroytecDumps 400-251 braindumps file you purchase in mailbox in a minute after payment. (If not received within 12 hours, please contact us. Note: don't forget to check your spam.)

Safe Payment Way

We adopt the most trusted and biggest payment platform Credit Card. Credit Card serves as a worldwide payment platform which ensures the security and protects buyers' interests. We can ensure your privacy security thus you can trust our platform and accurate 400-251 Dumps collection. We always consider for the interests of our buyers.

Our products for Cisco 400-251 exam dumps have three types:

Cisco 400-251 PDF version

If you prefer to 400-251 practice questions by paper and write them repeatedly, the PDF version is suitable for you. The 400-251 practice exam dumps pdf is available for printing out and view.
PC 400-251 Testing Engine version

Many people like studying on computer and the software version is similar with the 400-251 real exam scene. The soft version of 400-251 practice questions is interactive and personalized. It can point out your mistakes and note you to practice repeatedly. It helps you master well and keep you good station.
TroytecDumps 400-251 Online Testing Engine version (Support for offline use)

App version functions are nearly same with the software version. The difference is that app version of 400-251 practice exam online is available for all electronics and the software version is only available for the computers with Microsoft window system. APP (Online 400-251 Testing Engine) version is more widely useful and convenient for learners who can study whenever and wherever they want.

No help, Full refund!

TroytecDumps confidently stands behind all its offerings by giving Unconditional "No help, Full refund" Guarantee. Since the time our operations started we have never seen people report failure in the exam after using our 400-251 exam braindumps. With this feedback we can assure you of the benefits that you will get from our 400-251 exam question and answer and the high probability of clearing the 400-251 exam.

We still understand the effort, time, and money you will invest in preparing for your Cisco certification 400-251 exam, which makes failure in the exam really painful and disappointing. Although we cannot reduce your pain and disappointment but we can certainly share with you the financial loss.

This means that if due to any reason you are not able to pass the 400-251 actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.

0 Customer ReviewsCustomers Feedback ( Some similar or old comments have been hidden.)*

Cisco Related Exams

400-251

Related Certifications

Popular Vendors

Contact US:

Support: Contact now

Over 51879+ Satisfied Customers

Why Choose TroytecDumps

Quality and Value

TroytecDumps 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 TroytecDumps 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

TroytecDumps 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.