Sockets, port and loop-back ?

not_at_top-post
Date: 01/04/04 

Date: Sun, 04 Jan 2004 11:22:27 -0600

After reading Tannenbaum's 'Network' book, I had the illusion
that I understood some thing about networks !

Apparently not ?

Q1. Is it correct that 'ports' are sub-addresses of URLs;
  so that http://> will address the default port for http
at the IP of <someID>, and http://>:<not default number>
will address the <not default number> port at the IP of <someID> ?

Q2. does the client insert the port number when the request is made ?

Q3 at which ISO level/layer is the port number inserted ?

Q4. Do servers have pysically different ports for eg. http & ftp, or
 is it possibly the same physical [and some higher levels], just
 behaving differently when it's talking http or ftp ?

Q5. At what level are sockets ?

Q6. Are they also just 'abstract connections', time-sharing
and being socketX [when the data goes-to/comes-from X's
buffers] but latter serving as socketY ?

Q7. How does [or not] 'loopback' fit in with all this ?

Thanks for any answers.

== Chris Glur. easlab AT absamail . co . za

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