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  1. Home
  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2026-04-17.q249 Dumps
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Question 41

Which design benefit of PortFast is true?

Correct Answer: A
PortFast is a feature that allows access ports to enter the STP forwarding state immediately, without waiting for the usual listening and learning states. This accelerates the connection of end devices like PCs or servers.
A key design benefit is that PortFastdoes not trigger topology changeswhen devices are plugged in or disconnected. This prevents unnecessary STP recalculations and protects core stability.
* Correct Statement (A):STP does not consider link transitions on PortFast-enabled ports as topology changes, reducing control-plane overhead.
Other options misrepresent the function of PortFast:
* B:PortFast does not disable STP; it bypasses specific STP states.
* C/D/E/F:These describe other features like Loop Guard or UDLD, not PortFast.
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Question 42

Company XYZ uses an office model where the employees can use any open desk and plug their laptops in.
They want to authenticate the end users using their domain username and password before allowing them access to the network. The design must also accommodate the ability of controlling traffic within the same group or subnet if a macro (or micro) segmentation-based model is adopted in the future. Which protocol can be recommended for this design to authenticate end users?

Correct Answer: D
https://www.networkstraining.com/what-is-cisco-ise/
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Question 43

Refer to the exhibit.

An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?

Correct Answer: C
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Question 44

Which parameter is the most important factor to consider when deciding service placement in a cloud solution?

Correct Answer: B
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Question 45

You are designing a network running both IPv4 and IPv6 to deploy QoS. Which consideration is correct about the QoS for IPv4 and IPv6?

Correct Answer: A
QoS queuing mechanisms such as LLQ (Low Latency Queuing), PQ (Priority Queuing), and CQ (Custom Queuing) operate at the interface level and are protocol-independent. Both IPv4 and IPv6 packets can be classified, queued, and scheduled using these mechanisms.
Why other options are incorrect:
* B: Modern platforms support classification for IPv6 with hardware-based CEF.
* C: Separate class-maps are typically required for IPv4 and IPv6.
* D: The same queuing/congestion mechanisms apply to both IPv4 and IPv6.
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