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ThinkMo EDU Share – network 70.WAN encapsulation formats

蒂娜 No Comments 04/28/2023

ThinkMo EDU Share – network 70.WAN encapsulation formats

A Wide Area Network (WAN) is a network that spans over a large geographical area, connecting different locations. It provides a way for organizations to interconnect their offices, data centers, and remote users. To enable communication over the WAN, data must be encapsulated into packets that can traverse the network. Encapsulation formats define the structure of these packets and how they are transmitted over the WAN.

There are several WAN encapsulation formats used today, each with its unique characteristics, advantages, and disadvantages. In this article, we will discuss some of the most common WAN encapsulation formats.

Point-to-Point Protocol (PPP) PPP is a widely used WAN encapsulation format. It is a data link layer protocol that provides a way to transmit data over serial interfaces. PPP packets consist of a header, payload, and trailer. The header contains control information, such as the source and destination addresses, while the payload contains the actual data being transmitted. The trailer contains error detection and correction information.

PPP supports several authentication methods, such as Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). It also supports Network Address Translation (NAT) and Quality of Service (QoS) mechanisms.

High-Level Data Link Control (HDLC) HDLC is a bit-oriented protocol used for WAN encapsulation. It is similar to PPP in structure, with a header, payload, and trailer. The header contains control information, such as the address and control fields, while the payload contains the actual data being transmitted. The trailer contains error detection and correction information.

HDLC supports several operational modes, such as Asynchronous Balanced Mode (ABM) and Normal Response Mode (NRM). It also supports error control and flow control mechanisms.

Frame Relay Frame Relay is a packet-switching technology used for WAN encapsulation. It operates at the data link layer and provides a way to transmit data over high-speed digital networks. Frame Relay packets consist of a header and payload. The header contains control information, such as the Virtual Circuit Identifier (VCI) and Virtual Path Identifier (VPI), while the payload contains the actual data being transmitted.

Frame Relay supports several QoS mechanisms, such as Committed Information Rate (CIR) and Maximum Transmission Unit (MTU). It also supports error control and flow control mechanisms.

Asynchronous Transfer Mode (ATM) ATM is a cell-based protocol used for WAN encapsulation. It operates at the data link layer and provides a way to transmit data over high-speed digital networks. ATM cells consist of a header and payload. The header contains control information, such as the Virtual Path Identifier (VPI) and Virtual Circuit Identifier (VCI), while the payload contains the actual data being transmitted.

ATM supports several QoS mechanisms, such as Variable Bit Rate (VBR) and Available Bit Rate (ABR). It also supports error control and flow control mechanisms.

In conclusion, WAN encapsulation formats define how data is structured and transmitted over wide area networks. PPP, HDLC, Frame Relay, and ATM are some of the most common WAN encapsulation formats used today. Each has its unique characteristics, advantages, and disadvantages, and organizations should choose the format that best suits their needs.

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