Question 6 of 60

Which two statements about designing the Data Center Access layer are correct? (Choose two.)

    Correct Answer:

    Explanation

    User access is primarily layer 2 in nature, layer 2 clustering is possible only in layer 2

    Here is the from the Cisco press CCDA certification guide

    Figure 4-8. Enterprise Data Center Infrastructure Overview

    Defining the DC Access Layer -

    The data center access layers main purpose is to provide Layer 2 and Layer 3 physical port density for various servers in the data center. In addition, data center access layer switches provide high-performance, low-latency switching and can support a mix of oversubscription requirements. Both Layer 2 and Layer 3 access

    (also called routed access) designs are available, but most data center access layers are built using Layer 2 connectivity. The Layer 2 access design uses VLAN trunks upstream, which allows data center aggregation services to be shared across the same VLAN and across multiple switches. Other advantages of Layer 2 access are support for NIC teaming and server clustering that requires network connections to be Layer 2 adjacent or on the same VLAN with one another.

    CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 4

Question 7 of 60

Which one of these statements is true concerning the data center distribution (aggregation) layer design?

    Correct Answer: C

    A mix of both Layer 2 and Layer 3 access is sometimes the most optimal. This allows for flexibility in design, enabling the benefits of both Layer 2 (e.g., ease of VLAN management) and Layer 3 (e.g., routing and reduced broadcast domains) to be utilized where they are most effective.

Question 8 of 60

Which Gigabit Ethernet media type provides the longest reach without a repeater?

    Correct Answer:

Question 9 of 60

DRAG DROP -

Drag the network characteristic on the left to the design method on the right which will best ensure redundancy at the building distribution layer.

Select and Place:

    Correct Answer:

    Layer 2 between distribution and access layers, with a Layer 3 link between the distribution switches

    -> Support Layer 2 VLANs spanning multiple access layer switches across the distribution switches

    Layer 2 between distribution and access layers, with a Layer 2 link between the distribution switches

    -> FHRP for convergence, no VLANs span between access layer switches across the distribution switches

    VSS -> Convergence (FHRP) is not an issue

    The following are recommended best practices at the distribution layer:

    ✑ Use First-Hop Redundancy Protocols. Hot Standby Router Protocol (HSRP) or Gateway Load Balancing Protocol (GLBP) should be used if you implement

    Layer 2 links between the Layer 2 access switches and the distribution layer.

    ✑ Use Layer 3 routing protocols between the distribution and core switches to allow for fast convergence and load balancing.

    ✑ Use the distribution switches to connect Layer 2 VLANs that span multiple access layer switches.

    ✑ Use Virtual Switching System (VSS) to eliminate the use of STP and the need for HSRP.

    Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 3

Question 10 of 60

In the enterprise data center, which are the three main components? (Choose three.)

    Correct Answer: