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FTP
(File Transfer Protocol)
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20/21
"...a standard network protocol used to copy a file from one host to another over a TCP/IP-based network, such as the Internet." (source: Wikipedia)
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HTTP
(Hyper Text Transfer Protocol
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80
"A networking protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web." (source: Wikipedia)
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DNS
(Domain Name System)
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53
"...a hierarchical naming system built on a distributed database for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities." (source: Wikipedia)
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SSL
(Secure Socket Layer)
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443
"Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that "provide communications security over the Internet"." (source: Wikipedia)
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PPTP
(Point-to-Point Tunneling Protocol)
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1273
"...a method for implementing virtual private networks. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets." (source: Wikipedia)
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IPSec
(Internet Protocol Security)
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500/1701/4500
"...a protocol suite for securing Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session." (source: Wikipedia)
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SMTP(Simple Mail Transfer Protocol)
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25"...an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks." (source: Wikipedia)
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POP3(Post Office Protocol)
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110"...an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection." (source: Wikipedia)
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IMAP(Internet Message Access Protocol)
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143"...an Application Layer Internet protocol that allows an e-mail client to access e-mail on a remote mail server." (source: Wikipedia)
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