A 1MB (one megabyte) email message is sent from Seattle, Washington, USA. The se

Question

A 1MB (one megabyte) email message is sent from Seattle, Washington, USA. The sender's LAN is an Ethernet network. In order to reach its destination, the email message travels through the sender's Ethernet LAN and is then handed off to the public Internet (IPv4) network. The email's destination is Bangkok, Thailand.

a. calculate the number of IP packets necessary to contain the message.

b. calculate the number of bits contained in the IP email transmission.

c. calculate the number of bits contained in the email message at the time of its destruction.

d. In Japan, a massive network outage occurs which causes the email message to be lost (destroyed) in transit. Calculate the number of packets in the email message at the time of its destruction.

Explanation / Answer

a)

Size of the email message=1 MB =1024 KB

IP packet size=64 KB

Number of IP packets needed

b)

Size of the email message=

Number of IP packets needed=16

Size of the IP header =20 bytes

Number of bits contained in IP email transmission

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