Problems and Limitations of Ethernet in Objective-C

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The risk assessment will take into account the innate risks of a certain operation, but also consider information from within the organization to come up with a risk determination. This may require gathering information from the client organization. Auditors will weigh information from several sources when coming up with a risk assessment, as illustrated in Figure A-1.
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Quality of Service Every switch or router can offer some form of Quality of Service. However, for the effective transport of voice and video the QoS performance must be quite rigorous. Video and voice lose significant quality and become almost impossible to transport unless the network can guarantee tight controls on delay and delay variation. Networks of Ethernet switched introduce queuing delay that makes accurate delivery of video and voice unpredictable. Reliability A legacy of the voice network is a standard restoration time of < 50ms. This evolved to ensure that a failure of a voice circuit could be correct in a time rapid enough to be undetectable to the human ear during a voice call. Ethernet switching and routing have restoration mechanisms including Spanning Tree and Rapid Spanning tree that restore in under a minute for large networks, which is fine for many data applications but not within the tolerance required for voice and video. However, when voice and video are transported on Ethernet networks it becomes a required characteristic of Carrier Ethernet. Management Ethernet has historically used Simple Network Management Protocol (SNMP) Management Information Bases (MIB) to communicate Ethernet network fault information. This protocol however, is insufficient for the detailed link-by-link and endto-end fault detection and management required on large nationwide networks that may involve multiple service providers. The definition of new protocols and specifications to provide this type of visibility is important for Carrier Ethernet support. Scalability Historically, carriers had to offer bandwidth in very coarse increments. TDM jumps from 1.5 Mbps to 45 Mbps. This discontinuity in bandwidth introduced inefficiency into the WAN data network that Carrier Ethernet is designed to overcome. In addition, scalability implies a need to span large geographies and support millions of customers on the same network, all while potentially keeping each customer data separate. All five of these characteristics indicate areas where definitions, specifications, standards, and new approaches are required to make Ethernet packets and Ethernet services efficient and effective on large public networks. The IEEE 802.17 working group created the RPR standard to address these service provider requirements. RPR and Multiservice Support As mentioned in point C above and discussed in greater detail later in this chapter, RPR provides 4 classes of service. It also contains a ring wide protocol that makes each switch aware of the state of every link on the ring. The practical result of these two mechanisms is that delay and delay variation on the RPR become irrelevant even for voice and video applications. Hence, RPR networks support any data or circuit application with whatever performance is required for the application. RPR and Quality of Service These same mechanisms ensure quality of service (see Table 12.1). An RPR ring is deterministic. The performance of services put on a ring is
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the address of val, not its value, is passed to f( ). Thus, f( ) can modify the value of val. Notice that it is not necessary to precede val with the & operator when f( ) is called. The compiler automatically passes val s address. To see reference parameters in actual use, the swap( ) function is rewritten using references. Look carefully at how swap( ) is declared and called:
FECN (Forward Explicit Congestion Notification) is a frame relay flow control flag bit used to notify the receiving node that there is incoming network congestion. BECN (Backward Explicit Congestion Notification) is a frame relay flow control flag bit used to notify the sending node (source node) that there is network congestion on the outbound path. The suggested response is to reduce the frame rate into the network.
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