A home network has both wired and wireless connectivity. From a laptop computer, the user issues a ping to the wireless printer located in another room. The first two echo requests fail, but the last two succeed. Additional pings are all successful. Why do the first two echo requests fail?

A home network has both wired and wireless connectivity. From a laptop computer, the user issues a ping to the wireless printer located in another room. The first two echo requests fail, but the last two succeed. Additional pings are all successful. Why do the first two echo requests fail?

• The computer and the printer must join the wireless network first and that process takes time.
• The distance between the computer and the printer causes delay on the first two pings.
• The wireless printer must be activated and that takes time.
• The computer must use ARP to obtain the MAC address of the printer and this process takes time.

Explanation: In order to successfully send a packet on an Ethernet network, the computer sending the ping needs four key pieces of information: (1) source MAC address, (2) destination MAC address, (3) source IP address, and (4) destination IP address. The computer sending the ping knows its own source IP address and source MAC address. The computer also knows from the ping command the destination IP address. The only information not known is the destination MAC address. The destination MAC address is discovered by using ARP.

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