Question: When you click a link in a Web browser, a DNS lookup is needed as the IP address isn't cached locally. Three DNS servers are

When you click a link in a Web browser, a DNS lookup is needed as the IP address isn't cached locally. Three DNS servers are visited with RTT delays of

2, 12,

and

19

msecs respectively. The Web page has one object with an RTT to the server of

3

msecs.

1 .

Calculate time elapsed when client clicks link to receiving object, assuming zero transmission time for HTML

.

Answer:

2 .

Time elapsed for one base object and

5

small objects, using non

-

persistent HTTP and non

-

parallel TCP

.

Answer:

3 .

Time for same objects with up to

5

parallel TCP connections and non

-

persistent HTTP

.

Answer:

4 .

Time for same objects with up to

5

parallel TCP connections and persistent HTTP

.

Answer:

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