CCNA Data Center DCICT 640-916 Official Cert Guide

Chapter 7

1. D and E. MDS 9710 will have the onePK API feature in the future NX-OS releases to support programmability, essentially extending the concept of SDN into the SAN. 32 Gbps is under development but there is no Cisco MDS line card that supports 32 Gbps Fibre Channel at the time of writing this book.

2. B. Head-of-line blocking is a performance-limiting event that occurs when a line of packets is held up by the first packet because of congestion on another port. To ensure fairness between ports, frame switching uses a technique called virtual output queuing (VOQ). Combined with centralized arbitration, this ensures that when multiple input ports on multiple line cards are contending for a congested output port, there is complete fairness ...