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  3. 400-007

Cisco 400-007 Exam (page: 9)
Cisco Certified Design Expert CCDE v3.0
Updated on: 15-Feb-2026

Viewing Page 9 of 60
400-007 PDF 397 Questions

DRAG DROP (Drag and Drop is not supported)
Drag and drop the multicast protocols from the left onto the correct design situations on the right.
Select and Place:

  1. See Explanation section for answer.

Answer(s): A

Explanation:



Company XYZ, a global content provider, owns data centers on different continents. Their data center design involves a standard three-layer design with a Layer3-only core. HSRP is used as the FHRP. They require VLAN extension across access switches in all data centers, and they plan to purchase a Layer 2 interconnection between two of their data centers in Europe. In the absence of other business or technical constraints, which termination point is optimal for theLayer 2interconnection?

  1. at the core layer, to offer the possibility to isolate STP domains
  2. at the aggregation layer because it is the Layer 2 to Layer 3 demarcation point
  3. at the access layer because the STP root bridge does not need to align with the HSRP active node
  4. at the core layer because all external connections must terminate there for security reasons

Answer(s): B

Explanation:

The aggregation layer is the ideal termination point for the Layer 2 interconnection because it is the Layer 2 to Layer 3 demarcation point. This means that the Layer 2 interconnection can be isolated from the core layer, which can help to improve security and performance.

The other options are not as optimal. Option A, at the core layer, to offer the possibility to isolate STP domains, is not as optimal because it would require the Layer 2 interconnection to terminate at the core layer, which can increase latency and complexity. Option C, at the access layer because the STP root bridge does not need to align with the HSRP active node, is not as optimal because it would not allow for the isolation of STP domains. Option D, at the core layer because all external connections must terminate there for security reasons, is not as optimal because it is not necessary to terminate all external connections at the core layer.



Refer to the exhibit.

An engineer is designing the network for a multihomed customer running in AS 111 AS 111 does not have any other ASs connected to it.
Which technology is more comprehensive to use in the design to make sure that the AS is not being used as a transit AS?

  1. Include an AS path access list to send routes to the neighboringASs that only have AS 111 in the AS path field.
  2. Configure the AS-set attribute to allow only routes from AS 111 to be propagated to the neighborASs.
  3. Use the local preference attribute to configure your AS as a "non-transit" AS.
  4. Include a prefix list to only receive routes from neighboringASs.

Answer(s): A



Which interconnectivity method offers the fastest convergence in the event of a unidirectional issue between three Layer 3 switches connected together with routed links in the same rack in a data center?

  1. Fiber Ethernet connectivity with UDLD enabled
  2. Copper Ethernet connectivity with UDLD enabled
  3. Fiber Ethernet connectivity with BFD enabled
  4. Copper Ethernet connectivity with BFD enabled

Answer(s): C

Explanation:

BFD is a protocol that provides fast failure detection for Layer 2 and Layer 3 links. When a BFD session fails, the routers involved in the session will quickly detect the failure and take appropriate action.

UDLD is a protocol that provides link-level detection for Layer 2 links. When UDLD detects a unidirectional link, it will put the affected interface into err-disable state. This can prevent traffic from flowing over the affected interface, but it can also cause traffic disruption.

In the event of a unidirectional issue between three Layer 3 switches connected together with routed links in the same rack in a data center, BFD will provide the fastest convergence. This is because BFD will quickly detect the failure of the link and take action to reroute traffic.

The other options are not as fast. Option A, fiber Ethernet connectivity with UDLD enabled, will not be as fast as BFD because UDLD can take longer to detect a unidirectional link. Option B, copper Ethernet connectivity with UDLD enabled, will not be as fast as BFD because copper links are more susceptible to signal attenuation, which can lead to slower failure detection. Option D, copper Ethernet connectivity with BFD enabled, will not be as fast as BFD over fiber because copper links are more susceptible to signal attenuation.



You want to mitigate failures that are caused by STP loops that occur before UDLD detects the failure or that are caused by a device that is no longer sending BPDUs. Which mechanism do you use along with UDLD?

  1. BPDU guard
  2. root guard
  3. loop guard
  4. BPDU filtering

Answer(s): C

Explanation:

Loop guard is a Spanning Tree Protocol (STP) feature that helps prevent forwarding loops and blackholing of traffic by identifying and acting on logical one-way links that would otherwise go undetected.

UDLD (Unidirectional Link Detection) is a Layer 2 protocol that helps to prevent forwarding loops and blackholing of traffic by detecting unidirectional links. However, UDLD can take some time to detect a unidirectional link, and it may not detect a link that is no longer sending BPDUs.

Loop guard can be used along with UDLD to help mitigate failures that are caused by STP loops that occur before UDLD detects the failure or that are caused by a device that is no longer sending BPDUs. Loop guard will put a port into err-disable state if it detects a unidirectional link or if it does not receive BPDUs for a specified period of time.

The other options are not as effective for mitigating failures that are caused by STP loops. Option A, BPDU guard, will put a port into err-disable state if it receives BPDUs from a device that is not the designated bridge for the port. Option B, root guard, will put a port into err-disable state if it receives BPDUs that indicate that the port is the root bridge. Option D, BPDU filtering, will prevent BPDUs from being received on a port.



Viewing Page 9 of 60



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