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loops make the best use of parallelization. You will also want to confirm that you are actually getting performance gains before using a parallel loop in released application code. There are a couple of other things to mention about the preceding program. First, notice that the parallel initialization loop uses a lambda expression to initialize data. It is shown here:
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1. With an object selected on the page, in the Uniform Fill dialog (press SHIFT+F11),
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The well-known ping command uses the ICMP 8 Echo Request packet type. If the target station is reachable, it will respond with ICMP 1 Echo Reply packets. The ping command is used to determine whether a particular system is reachable from another system over a TCP/IP network. IGMP Protocol IGMP is used to manage a type of communications called multicast. IPsec Protocol Internet Protocol Security, usually known as IPsec, is a suite of protocols that is used to secure IP-based communication. The security that IPsec provides is authentication and encryption. IPsec authentication is used to confirm the identity of a station on a network. This is used to prevent a rogue system from easily masquerading as another, real system. Authentication is achieved through the establishment of a security association (SA) between two nodes, which permits the transmission of data from the originating node to the destination node. If the two nodes need to send messages in both directions, two SAs need to be established. The Internet Key Exchange (IKE) protocol is used to set up associations. IPsec has two primary modes of operation: Transport mode Here, only the payload of an incoming packet is authenticated or encrypted. The original IP header is left intact. The original headers are protected with hashes; if the headers are altered, the hashes will fail and an error will occur. Tunnel mode Here, each entire incoming packet is encapsulated within an IPsec packet. The entire incoming packet can be encrypted, which protects the packet against eavesdropping. This mode is often used for protecting network traffic that traverses the Internet, thereby creating a VPN between two nodes, between two networks, or between a remote node and a network. IPsec tunnel mode is shown in Figure 5-20.
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Address translation is discussed in 5.
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s was mentioned in s 2 and 4, layer 2 devices, including bridges and switches, always propagate certain kinds of traffic in the broadcast domain: broadcasts, multicasts, and unknown destination traffic. This process impacts every machine in the broadcast domain (layer 2 network). It impacts the bandwidth of these devices connections as well as their local processing. If you were using bridges, the only solution available to solve this problem would be to break up the broadcast domain into multiple broadcast domains and interconnect these domains with a router. With this approach, each new broadcast domain would be a new logical segment and would need a unique network number to differentiate it from the other layer 3 logical segments. Unfortunately, this is a costly solution, since each broadcast domain, each logical segment, needs its own port on a router. The more broadcast domains that you have from bridges, the bigger the router required: an interface for each broadcast domain. As you will see in this chapter, switches also have the same problem with traffic that must be flooded. You will see, however, that switches have a unique solution to reduce the number of router ports required and thus the cost of the layer 3 device that you need to obtain: virtual LANs and trunking.
equipment in buildings where commercial power is available. Such equipment is usually rack-mounted. At these locations, optical and RF signal levels can be deleted or added. 4.421 Measurement of optical signals at the receive sites is necessary to establish the optical signal input to the receiver. When setting up a system, the transmitter at the hub/headend is turned on and the optical signal is measured at its output. When the optical ber is connected to the transmitter, the optical signal level is measured at the receive point. The difference in levels is the cable loss. These levels are measured with an optical power meter indicating the level in dBm of optical power. The difference in dBm readings from transmitter to receiver is the optical cable loss in dB. Next, the signals are connected to the transmitter and the power level in dBm at the receiver is recorded. This value can be written on a label at the receiver for future reference. Now the RF signals can be measured and adjusted, as required by the coaxial cable system. Such adjustments are for level and slope of the television carriers. Most optical power meters are battery-powered and operate in either a single- or dual wavelength mode. Such optical power meters have a variety of features, such as the inputconnector type, a set of adapters, extra battery packs, as well as a carrying case. Some power meters have an accompanying light source available to aid in making ber-optic cable-loss tests. As stated earlier, readout is in optical power level in dBm (1 mw reference). These instruments cost anywhere from $500 to $1,500, depending on model and options. 4.422 After the optical ber system has been installed by the subcontractor and the actual lengths of optical cable has been substantiated, a rigorous testing program should be conducted. Essentially this follows the same information from the design phase of the project. All the losses in each section are measured and compared to the projected values assumed in the design phase. Such losses include optical- ber loss, connector loss, and splice loss, plus an assumed margin loss (usually 2 or 3 dB). If the measurement of these losses con rms that the assumed losses used in the design are close, it can be assumed the optical- ber system will perform according to speci cations. See Table 4-2 for an example of optical loss measurements. The measured data should be measured at the design optical wavelength using a light source and optical power meter. Reasonably priced, accurate optical time domain re ectometers (OTDR) are available for measuring total link loss. These instruments can make the measurements on most
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