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new ccna exam cost 2020.2. AmplifierIf a cable is added between the antenna and the wireless device, it will increase its loss. To compensate for this loss, the gain needs to be increased. However, it may not be possible to add enough gain to compensate for the loss. In this case, an amplifier should be added between the AP and the antenna to strengthen the signal. This method is called an activeamplifier, due to the fact that it strengthens the antenna signal.66 Chapter 5 Antenna CommunicationThe antenna is used to provide point-to-point communication capability. This requires the installation of an outdoor antenna, usually mounted on the roof of the house. This antenna cable backs up to the bridge or AP's wireless device and returns from the wireless device to the common distributed system. In other words, the parabolic dish antenna provides a path back to the wired LAN. So logically, if a lightning bolt strikes the antenna or AP, its energy could potentially be transmitted along the cable, which would potentially cause damage to the entire wired LAN.3. lightning arrester parabolic dish antennas are one of the antenna types discussed in this chapter.These antennas provide two networks that are far apart67 Chapter 5 Antenna Communicationsup point-to-point communication capability. This requires the installation of an outdoor antenna, usually mounted on the roof. This antenna cable backs up to the bridge or AP's wireless device and returns from the wireless device to the common distributed system. In other words, the parabolic dish antenna provides a path back to the wired LAN. So logically, if a lightning bolt strikes an antenna or AP, its energy could potentially travel along the cable, which would potentially cause damage to the entire wired LAN.The good news is that this can be avoided with a lightningarrestor. CiscoAironet lightning arrestors, shown in Figure 5-26, prevent shock surges from reaching RF equipment through their own shunt effect.Within about 100 nanoseconds, the surge is limited to less than 50V. Since a typical lightning surge is 2 microseconds, this shouldprovide adequate protection against indirect lightning strikes. Lightning arresters do not attempt to stop lightning strikes directly. The lightning arrester also needs to be grounded, as