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| Vendor: | Cisco |
|---|---|
| Exam Code: | 400-007 |
| Exam Name: | Cisco Certified Design Expert CCDE v3.1 |
| Exam Questions: | 551 |
| Last Updated: | August 4, 2026 |
| Related Certifications: | Cisco Certified Design Expert |
| Exam Tags: | Design Expert Cisco Network Architects and Senior Network Design Engineers |
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You are designing a network for a branch office. In order to improve convergence time, you are required to use the BFD feature. Which four routing protocols can you use to facilitate this? (Choose four.)
Bidirectional Forwarding Detection (BFD) provides fast failure detection independent of routing protocols. It can be integrated with multiple protocols to accelerate convergence:
A: IS-IS supports BFD for fast hello processing.
B: BFD can track static routes via routing tracking features.
D: EIGRP supports BFD for link failure detection.
E: BGP supports BFD for rapid session teardown.
Why option C is incorrect:
C: RIP does not natively support BFD integration.
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Which two factors provide multifactor authentication for secure access to applications and data? (Choose two.)
C (Push-based):Push notifications to a registered device (typically a phone) are used as a second authentication factor.
D (Possession-based):Possession factor includes physical tokens, smart cards, or registered devices --- verifying that the user possesses something unique.
Other options explained:
A/B/E: Not valid MFA factors under standard authentication frameworks.
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Which two protocols are used by SDN controllers to communicate with switches and routers? (Choose two.)
B (OpenFlow):OpenFlow is a widely used SDN southbound protocol that enables controllers to directly manage forwarding tables of switches.
D (Open vSwitch Database - OVSDB):OVSDB is used by SDN controllers (especially in virtualized environments) to manage configuration state and flow entries on Open vSwitch instances.
Other options explained:
A/C: Non-existent protocols.
E: NetFlow is a traffic monitoring protocol, not a control interface for SDN controllers.
Which function is performed at the access layer of the three-layer hierarchical network design model?
In the Cisco three-layer hierarchical design model (Access, Distribution, Core), the access layer is primarily responsible for:
Providing user/device connectivity.
Enforcing policy boundaries.
Performing QoS classification and marking at ingress.
The access layer is the optimal point to classify and mark traffic for QoS because:
It is the first point of entry into the network for end-user devices.
Markings can then be trusted by upstream devices (distribution and core).
This minimizes trust boundaries throughout the network and ensures consistent policy enforcement.
This design principle ensures end-to-end QoS consistency, a key objective emphasized in CCDE v3.1 for scalable and maintainable enterprise designs.
Why other options are incorrect:
A (Fault isolation): Typically handled at distribution/core layers.
C (Reliability): A general network-wide requirement, not specific to access.
D (Fast transport): Primarily a core layer function.
E (Redundancy and load balancing): Managed primarily at distribution and core layers.
Which two actions reduce the impact of trusted NMS polling (e.g., high CPU on devices, instability)? (Choose two)
A: Restricting SNMP OID polling to only necessary objects prevents large MIB walks and reduces processing load.
D: Associating SNMP communities with ACLs allows access control and limits polling scope to trusted hosts.
Other options:
B: Disabling OIDs on the NMS reduces resource usage there, but doesn't protect network devices.
C: Increasing SNMP priority could negatively impact other processes and is not a best practice.
E: Unloading MIBs on devices is typically not possible or effective.
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