Menstransfer data dalam format plain texkt, hypertext, audio,video dll
Namun sesuai namanya. HTTP hanya efisien untuk menampilkan text
Cara kerjanya : jika ada request maka sesegera mungkin server akan merespon
Request :
- request line method yang dipakai untuk mengakses URL (alamat diamana sebuah dokumen bisa diakses)
- request type
- resource
- versi HTTP
www.google.com:80/ artinya : google.com itu server, 80 adalah port nya, lalu setelah garis miring adalah subfolder nya
Response :
- berisi tanggapan yang diberikan oleh server
Status line terdiri dari HTTP method ://host:port/path version, status code dan status phrase
2. FTP : untuk copy file satu host ke yang lain
Hubungan koneksi terdiri dua hubungan yang berfungsi untuk transfer data & control
FTP menggunakan layanan well-known port 21 sebagai control
3. SMTP : Simple Mail Transfer Protocol
protocol yang dapat dipergunakan untuk mengirim e-mail ke suatu tujuan yang sudah ditentukan
Ports
Server administrators choose whether clients use TCP port 25 (SMTP) or port 587 (Submission), as formalized in RFC 6409 (previously RFC 2476), for relaying outbound mail to an initial mail server. The specifications and many servers support both. Although some servers support port 465 for legacy secure SMTP in violation of the specifications, it is preferable to use standard ports and standard ESMTP commands[17] according to RFC 3207 if a secure session needs to be used between the client and the server.
Some servers are set up to reject all relaying on port 25, but valid users authenticating on port 587 are allowed to relay mail to any valid address.
Some Internet service providers intercept port 25, redirecting traffic to their own SMTP server regardless of the destination address. This means that it is not possible for their users to access an SMTP server outside the ISP's network using port 25.
Some SMTP servers support authenticated access on an additional port other than 587 or 25 to allow users to connect to them even if port 25 is blocked, but 587 is the standardized and widely-supported port for users to submit new mail.
Microsoft Exchange Server 2013 SMTP can listen on ports 25, 587, 465, 475, and 2525, depending on server role and whether roles are combined on a single server. Ports 25 and 587 are used to provide client connectivity to the front end transport service on the client access server (CAS) role. Ports 25, 465, and 475 are used by the mailbox transport service. However, when the mailbox role is combined with the CAS role on a single server, port 2525 is used by the mailbox role for SMTP from the CAS front end transport service, while CAS continues to use port 25. Port 465 is used by the mailbox transport service to receive client connections proxied by the CAS role. Port 475 is used by the mailbox role to communicate directly with other mailbox roles, transferring mail between the mailbox transport submission service and the mailbox transport delivery service.
sumber : http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol
4. DNS : Domain Name System
sistem yang menyimpan informasi tentang nama host maupun nama domain dalam bentuk baris data tersebar. Biasa kita kenal dengan istilah "Bookmark"
5. Telnet : Protokol yang digunakan untuk melakukan remote access dengan mengakses suatu "machine" dari jarak jauh
- Telnet men-support adanya autentifikasi dari user, tetapi telnet tidak men-support enkripsi pada transport data
Related RFCs
- RFC 137, TELNET protocol specification
- RFC 139, TELNET protocol specification
- RFC 854, TELNET protocol specification
- RFC 855, TELNET option specifications
- RFC 856, TELNET binary transmission
- RFC 857, TELNET echo option
- RFC 858, TELNET suppress Go Ahead option
- RFC 859, TELNET status option
- RFC 860, TELNET timing mark option
- RFC 861, TELNET extended options - list option
- RFC 885, Telnet end of record option
- RFC 1041, Telnet 3270 regime option
- RFC 1073, Telnet Window Size Option
- RFC 1079, Telnet terminal speed option
- RFC 1091, Telnet terminal-type option
- RFC 1096, Telnet X display location option
- RFC 1116, Telnet Linemode Option
- RFC 1123, Requirements for Internet Hosts - Application and Support
- RFC 1143, The Q Method of Implementing TELNET Option Negotiation
- RFC 1184, Telnet linemode option
- RFC 1205, 5250 Telnet interface
- RFC 1372, Telnet remote flow control option
- RFC 1572, Telnet Environment Option
- RFC 2217, Telnet Com Port Control Option
- RFC 2941, Telnet Authentication Option
- RFC 2942, Telnet Authentication: Kerberos Version 5
- RFC 2943, TELNET Authentication Using DSA
- RFC 2944, Telnet Authentication: SRP
- RFC 2946, Telnet Data Encryption Option
- RFC 4248, The telnet URI Scheme
- RFC 4777, IBM's iSeries Telnet Enhancements
Sumber : http://en.wikipedia.org/wiki/Telnet
Tidak ada komentar:
Posting Komentar