CCIE Security Written Exam

Here you have the best Cisco 400-251 practice exam questions

  • You have 952 total questions across 191 pages (5 per page)
  • These questions were last updated on March 17, 2026
  • This site is not affiliated with or endorsed by Cisco.
Question 1 of 952
In an 802.11 WLAN, which option is the Layer 2 identifier of a basic service set, and also is typically the MAC address of the radio of the access point?
Answer

Suggested Answer

The suggested answer is A.

Question 2 of 952
What term describes an access point which is detected by your wireless network, but is not a trusted or managed access point?
Answer

Suggested Answer

The suggested answer is A.

Question 3 of 952
A router has four interfaces addressed as 10.1.1.1/24, 10.1.2.1/24, 10.1.3.1/24, and 10.1.4.1/24. What is the smallest summary route that can be advertised covering these four subnets?
Answer

Suggested Answer

The suggested answer is C.

Community Votes3 votes
CSuggested
100%
Question 4 of 952
Which two address translation types can map a group of private addresses to a smaller group of public addresses? (Choose two.)
Answer

Suggested Answer

The suggested answer is C, D.

Question 5 of 952
Which authentication mechanism is available to OSPFv3?
Answer

Suggested Answer

The suggested answer is E.

About the Cisco 400-251 Certification Exam

About the Exam

The Cisco 400-251 (CCIE Security Written Exam) validates your knowledge and skills. Passing demonstrates proficiency and can boost your career prospects in the field.

How to Prepare

Work through all 952 practice questions across 191 pages. Focus on understanding the reasoning behind each answer rather than memorizing responses to be ready for any variation on the real exam.

Why Practice Exams?

Practice exams help you familiarize yourself with the question format, manage your time, and reduce anxiety on the test day. Our 400-251 questions are regularly updated to reflect the latest exam objectives.