Slide 15

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Sockets

Analogy with Telephone: Instrument, Number, Line

$\begin{figure}\centerline{\epsfig{figure=/home/sri/courses/figs/eps/sock-def,width=2.5in}} \end{figure}$

Example Applications: From /etc/services

Connection Oriented (TCP)

Client Server Port

Mail smtpd 25

Telnet telnetd 23

FTP ftpd 20,21

WWW Browser httpd 80
Connectionless (UDP)

Client Server Port

SNMP snmpd 161

NFS nfsd 2049

Sridhar Iyer
2000-08-04