400-007

400-007 practice questions, page 9 of 14, with answer review and explanations.

Question 41

Drag and drop the multicast protocols from the left onto the correct design situations on the right. Select and Place:

Question 42

Company XYZ, a global content provider, owns data centers on different continents. Their data center design involves a standard three-layer design with a Layer 3-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 the Layer 2 interconnection?

  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

Question 43

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 neighboring ASs 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 neighbor ASs.
  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 neighboring ASs.

Question 44

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

Question 45

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