What is the transmission efficiency of a 1,000-byte file sent in response to a Web request HTTP, TCP/IP, and Ethernet? Assume the HTTP packet has 100 bytes in addition to the 1,000-byte file. Hint: Remember from Chapter 4 that efficiency = user data/total transmis- sion size.

Hint: Cal;culate a single transmission efficiency number from one perspective of the 1,000 byte file. use the following assumptions

-1,000 bytes for size of user data file

-100 bytes for size of htttp header

- "typical" size for tcp header (including the options field)

-defualt size for IPv4 header (including the options field)

for the ethernet overhead assume that "Ethernet 802.3ac is used use figure 4.10a to figure out the size of ethernet 802.3ac overhead bytes,

assume that VLAN is used

assume that the size of the ethernet 802.3ac control field is 2 bytes

Start of Destination Source VLAN Length DSAPSSAP |ContDt Frame Check Frame AddressAddress Tag Sequence 1 6 4 2 1-2 46-1,500 bytes byte bytes bytes bytes bytes byte byte bytes bytes bytes FIGURE 4.10a Ethernet 802.3ac frame layout Start of Destination Source VLAN Length DSAPSSAP |ContDt Frame Check Frame AddressAddress Tag Sequence 1 6 4 2 1-2 46-1,500 bytes byte bytes bytes bytes bytes byte byte bytes bytes bytes FIGURE 4.10a Ethernet 802.3ac frame layout