which cisco certification is in demand 2019

which cisco certification is in demand 2019.devices cannot see each other. In this case, it may be necessary to remove the obstacle, however, sometimes it is not feasible to remove a fence. In this case, the other measures mentioned need to be taken. The purpose of these measures is either to make the clients listen to each other (or RTS/CTS) so that they do not transmit at the same time, or to place the clients on different APs and work on different channels. By reducing the cell range, the clients can be placed on different channels, but by reducing the transmission power, more APs need to be added to fully cover the area. By forcing RTS/CTS, clients may still be on the same channel, but at least they won't interfere with each other.Another common problem is called the exposed node problem (Another common problem is called the ExposedNodeissue, which occurs when two wireless cells exist on the same channel and they are too close to each other. This usually occurs in wireless 802.11b/g networks because they only have three non-overlapping channels. If a client located in any of the overlapping cells transmits a packet, a conflict will occur. A simple improvement would be to change the topology, or at least the channel assignment. In some cases, this is not possible, so consider changing to an 802.11a deployment, which will have more channels available for allocation. Another problem that occurs between the client and the AP is the Near/Far issue, which is caused by the AP transmitting a voltage standbyThis is caused by the fact that the AP transmitter power is higher than the client transmitter power. When the client finds the AP, it tries to associate with the AP due to the strong signal of the AP (.11).to try to associate with the AP. Because the client transmitter power is weaker than the AP transmitter power, the client cannot reach the AP coverage. Thismeans that the client's propagation cannot reach the AP, and thus the association fails. The controller feature can be used to solve this problem. The controller can help monitormonitor the client signals and adjust the wireless resources as needed.20.2 Basic Topics 335Also, as you might expect, backward compatibility is an issue. This problem occurs when 802.11b clients enter 802.11g cells and when 802.11b/g/a clients enter 802.11n cells, with the common symptom being a reduction in overall data rates. To solve this problem, the 802.11g client can be locked to a cell on an 802.llg-only network.20.2.3 Troubleshooting with the CLI