+16
HTTP :
+ HTTP
+
+
.
+ SMTP
, HTTP.
+HTTP
+HTTP ,
+ -
HTTP/1.1, ( ) HTTP/1.0.
+ Web
+ html , xml
+
+
Hyper Text Transfer Protocol?
+Tim Berners-Lee
.
+OSPF
+IGRP
+IS-IS
.
SMTP , POP3 IMAP4 -
IMAP4 OSI/RM
+
SMTP, POP3, IMAP4 OSI/RM,
SMTP - , POP3 -
BCC , , :
+Blind Carbon Copy
- ...
+ ,
DNS ( ) ... ( )
+... IP .
+...
+... IP .
in-addr.arpa.
+ IP ( )
HTTP ?
GET /path/file.html HTTP/1.1
From: me@my_mail.ru
User-Agent: my_soft/3.0
[blank line here]
+ host:
.
+IMAP4
ICMP TRACEROUTE (TRACERT Windows)?
+Time Exceeded ( )
, HTTP .
+ ,
|
|
+
+ ,
, HTTP/1.1.
+LIST
+FETCH
DNS.
+A
+NS
+SOA
+CNAME
, , RIP.
+
+
+
- ...
+ ,
POP3.
+RETR
+APOP
+LIST
SMTP ESMTP.
+RCPT
+EHLO
+HELO
OSI/RM, " , OSPF".
SMTP ?
+, NOOP TCP