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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Protocol Suite and Architecture

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TCP/IP Architecture and the TCP/IP Model
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TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
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TCP/IP Protocols
(Page 4 of 4)

Application Layer (OSI Layer 5/6/7) Protocols

As discussed in the topic on the TCP/IP model, in TCP/IP the single application layer covers the equivalent of OSI layers 5, 6 and 7. The application protocols covered in this Guide are shown in Table 23.

Table 23: TCP/IP Protocols: Application Layer (OSI Layer 5/6/7)

Protocol Name

Protocol Abbr.


Domain Name System


Provides the ability to refer to IP devices using names instead of just numerical IP addresses. Allows machines to resolve these names into their corresponding IP addresses.

Network File System


Allows files to be shared seamlessly across TCP/IP networks.

Bootstrap Protocol


Developed to address some of the issues with RARP and used in a similar manner: to allow the configuration of a TCP/IP device at startup. Generally superseded by DHCP.

Dynamic Host
Configuration Protocol


A complete protocol for configuring TCP/IP devices and managing IP addresses. The successor to RARP and BOOTP, it includes numerous features and capabilities.

Simple Network Management Protocol


A full-featured protocol for remote management of networks and devices.

Remote Monitoring


A diagnostic “protocol” (really a part of SNMP) used for remote monitoring of network devices.

File Transfer Protocol, Trivial File Transfer Protocol


Protocols designed to permit the transfer of all types of files from one device to another.

RFC 822, Multipurpose Internet Mail Extensions, Simple Mail Transfer Protocol, Post Office Protocol, Internet Message Access Protocol


Protocols that define the formatting, delivery and storage of electronic mail messages on TCP/IP networks.

Network News Transfer Protocol


Enables the operation of the Usenet online community by transferring Usenet news messages between hosts.

Hypertext Transfer Protocol


Transfers hypertext documents between hosts; implements the World Wide Web.

Gopher Protocol


An older document retrieval protocol, now largely replaced by the World Wide Web.

Telnet Protocol


Allows a user on one machine to establish a remote terminal session on another.

Berkeley “r” Commands

Permit commands and operations on one machine to be performed on another.

Internet Relay Chat


Allows real-time chat between TCP/IP users.

Administration and Troubleshooting Utilities and Protocols

A collection of software tools that allows administrators to manage, configure and troubleshoot TCP/IP internetworks.


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TCP/IP Architecture and the TCP/IP Model
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TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
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