Which two statements about designing the Data Center Access layer are correct? (Choose two.)
Which two statements about designing the Data Center Access layer are correct? (Choose two.)
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
Which one of these statements is true concerning the data center distribution (aggregation) layer design?
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.
Which Gigabit Ethernet media type provides the longest reach without a repeater?
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:
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
In the enterprise data center, which are the three main components? (Choose three.)