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A. Service Layer OAM focuses on the " end-to-end " connectivity of an Ethernet virtual circuit . A. A. Ethernet OAM must provide capabilities on a link level and an end-to-end service level . Given the bad blood between TMPW and Forbes , it 's hardly a surprise that the article got published without too much of a look at the real facts . Finally , the tools window displays a series of fabric-oriented tools that are used to configure , monitor , or troubleshoot a fabric of Cisco MDS 9000 Family switches . In the simplest sense , a logical port is a representation of a physical ports aggregate VLAN membership . A. Without Ethernet OAM , the operator has limited visibility from the network operations center ( NOC ) . A. Triple-play services to consumers with high-definition video , video on demand ( VoD ) , and interactive broadband media applications are accelerating the need for bandwidth , and FTTH provides a number of solutions to reduce congestion in the last mile . " First it was a software company , then it was a job board , then it was a service company then it was a software company again . A Sarko , at SUNY-ESF has offered a course on diffraction and provides the notes here , basic cyrstallography , and introduction to polymer diffraction , problems and answers .