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  2. Cisco Certification
  3. 400-007 Exam
  4. Cisco.400-007.v2025-12-06.q401 Dumps
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Question 286

Company XYZ wants to prevent switch loops caused by unidirectional point-to-point link conditions on Rapid PVST+ and MST. Which technology can be used in the design to meet this requirement?

Correct Answer: B
STP Bridge Assuranceis a mechanism used to protect againstunidirectional link failureson point-to-point STP connections in environments likeRapid PVST+ and MST. When Bridge Assurance is enabled, BPDUs are expected on all BPDUs-capable interfaces. If a switch stops receiving BPDUs on a point-to-point link where Bridge Assurance is enabled, it assumes the link has failed and transitions the port to blocking to prevent a loop.
This is especially useful in high-availability enterprise designs that require protection from unexpected switch behavior or partial link failures.
Why other options are incorrect:
* A. BPDU Guard: Protects access ports by placing them in an err-disabled state if BPDUs are received-useful at the edge, not for core loop protection.
* C. MSTP: Refers to the protocol itself but does not solve the unidirectional link issue on its own.
* D. TRILL: A different architecture (layer 2 routing) and not applicable to Rapid PVST+ or MST- specific protection.
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Question 287

An enterprise solution team is performing an analysis of multilayer architecture and multicontroller SDN solutions for multisite deployments. The analysis focuses on the ability to run tasks on any controller via a standardized interface. Which requirement addresses this ability on a multicontroller platform?

Correct Answer: A
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Question 288

Which two conditions must be met for EIGRP to maintain an alternate loop-free path to a remote network?
(Choose two.)

Correct Answer: A,E
For EIGRP to maintain loop-free alternate paths, the feasibility condition must be met:
* A. The Reported Distance (RD) must be lower than the router's Feasible Distance (FD).
* E. A feasible successor must exist (i.e., an alternate next-hop satisfying the feasibility condition).
This design allows immediate failover without recomputation, ensuring fast convergence - a critical CCDE v3.1 protocol design principle.
Why other options are incorrect:
* B, C, D: Misstate the feasibility condition or confuse RD and FD relationships.
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Question 289


Refer to the exhibit. A service provider has a requirement to use Ethernet OAM to detect end-to-end connectivity failures between SP-SW1 and SP-SW2. Which two ways to design this solution are true?
(Choose two)

Correct Answer: A,B
In service provider Ethernet transport environments such as VPLS, Ethernet OAM (Operations, Administration, and Maintenance) is used to provide fault detection, monitoring, and troubleshooting capabilities. The two relevant components here are:
* A (Unicast heartbeat messages between MEPs): Maintenance End Points (MEPs) are configured at the edges of the OAM domain (SP-SW1 and SP-SW2). Heartbeat messages can be used to proactively monitor and detect loss of continuity between the endpoints.
* B (Enable Connectivity Fault Management): CFM (IEEE 802.1ag) provides end-to-end fault detection, continuity check messages (CCMs), loopback, and link trace mechanisms that operate between MEPs at Layer 2. CFM enables proactive detection of failures and service-level assurance across the provider's Ethernet segment.
Other options explained:
* C: Upward MEPs are not applicable here since these are typically used for customer-facing or hierarchical maintenance domains.
* D: E-LMI (Ethernet Local Management Interface) operates between CE and PE for service activation- not applicable for SP-SW to SP-SW fault detection across VPLS.
* E: LLDP (Link Layer Discovery Protocol) is for neighbor discovery on directly connected interfaces- not suitable for end-to-end fault detection across a VPLS domain.
This design solution aligns fully with CCDE v3.1 principles for service provider Layer 2 VPN design and Ethernet OAM integration.
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Question 290

synchronizing data between host A and host B. To increase chance of delivery the same data is sent twice from host A on two different NICs toward the two NICs on host B.

Which solution must be deployed in the network to ensure that any failure in the network does not trigger data loss on host B?

Correct Answer: A
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