Which of the following Cisco Unified Fabric Features can result in reduced cabling?
Of the available choices, converged network adapters (CNAs) are the Cisco Unified Fabric feature that can result in reduced cabling. Cisco Unified Fabric is a combination of architecture and high performance concepts that is intended to simplify data center networks. CNAs are network adapters that combine network interface cards (NICs) and host bus adapters (HBAs), enabling one adapter to support both Ethernet and Fibre Channel (FC). A server that contains separate FC and local area network (LAN) ports can require significantly more cabling than a server that is configured with a CNA. Cisco Unified Fabric also helps converge a data center’s LAN and storage area network (SAN) over a single transport in order to simplify management, provisioning, and operation.
Virtual Port Channels (vPCs) do not necessarily result in reduced cabling. A vPC is a Cisco Unified Fabric alternative to a traditional EtherChannel port channel. Therefore, vPCs are intended to create high-bandwidth redundant links between Layer 2 devices. Traditional EtherChannel relies on Spanning Tree Protocol (STP). Port channels that are created by using vPCs still rely on STP to mitigate switching links if they occur, but do not rely on it in the same functional way that EtherChannel does.
Virtual extensible LANs (VXLANs) are not a Cisco Unified Fabric that can result in reduced cabling. VXLANs use Layer 3 technologies to extend Layer 2 technologies. In this way, VXLANs can achieve the same results as Cisco FabricPath without implementing FabricPath. Cisco FabricPath enables the scaling of a Layer 2 network beyond normal practical limitations by using Layer 3 routing protocol Intermediate System-to-Intermediate System (IS-IS) in place of STP.
STP is not a Cisco Unified Fabric feature. Instead, STP is a Layer 2 protocol that is intended to prevent switching loops in a network with redundant links.