1. 1. The part of message that is missing is retransmitted
2. 2. DNS => A user request a website by typping in it’s name
E-mail => Internet protocol enable user to send the message to each other over the internet
File transfer => A user upload new to his or her website
DHCP => A workstation gets its ip address automaticly
Web service => A user types in a URL and a page loads in the client browser
Telnet => A network technician logs into a workstation from the remote site
3. 3. DNS server => translate a domain name to an ip address
Commond DNS port number => 53
Domain name => cisco.com
4. 4. DNS
5. 5. Web server => host a web page
Web client => request a web page
HTML => used to create web page
HTTPS => secure protocol that uses port 443
HTTP=> protocol commonly used by a web browser
6. 6. Protocol used to process e-mail
• SMTP
• IMAP4
• POP3
7. 7. VoIP
8. 8. DHCP => 68
DNS=> 53
FTP data=> 20
HTTP=> 80
HTTPS=> 443
POP3=> 110
SNMP=161
Telnet=> 23
9. 9. FTP, POP3, , DHCP
Kamis, 14 Oktober 2010
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