CCIE Security Written Exam

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

  • You have 952 total questions to study from
  • Each page has 5 questions, making a total of 191 pages
  • You can navigate through the pages using the buttons at the bottom
  • This questions were last updated on December 13, 2025
  • 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?
Correct Answer: 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?
Correct Answer: 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?
Correct Answer: C

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.)
Correct Answer: C, D

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