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Refer to the exhibit. PC50 has been recently integrated into the network. When the network administrator tests connectivity from Router _R1to PC50 the first PING results in an 80% of success rate. The next tests results in a 100% of success rate and so on. What is the cause of this 20% failure in the first test?
The Router _R1 had to resolve the PC50s Hardware Address.
Router _R1 lookup into the routing table results in a delay.
The router _R1 had to translate the IP address of PC50 using NAT.
The network is congested, resulting in some packets to be dropped.
When a new device is installed on a network, the rest of devices dont know information about this device. In this scenario Router _R1 sends an IP packet for the first time to PC50. Router _R1 knows the IP address but doesnt know the MAC address to build the frame. Router _R1 then sends an ARP request as a broadcast frame, and waits for the ARP reply to learn the MAC address of PC50. The initial delay when learning the MAC address results in the failure of the first IP packet transmission. After the ARP cache contains the mapping from hardware address and IP there is no failure in the ping test. If the IP address is in the same subnet there is no need for a routing table. The same case is for NAT which provides translation for private to public addresses.
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