Free 400-007 Exam Braindumps (page: 12)

Page 11 of 74

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.






Post your Comments and Discuss Cisco® 400-007 exam with other Community members:

400-007 Discussions & Posts