From 118d46bc8e45f8ff87ef201b6024e4a1c5bf710b Mon Sep 17 00:00:00 2001 From: bunderontheway Date: Mon, 24 Dec 2018 22:46:59 +0700 Subject: [PATCH] add protocols on layer 4 (#27695) --- guide/english/network-engineering/osi-layers/index.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/guide/english/network-engineering/osi-layers/index.md b/guide/english/network-engineering/osi-layers/index.md index 3f54a39c44..68b2b67bda 100644 --- a/guide/english/network-engineering/osi-layers/index.md +++ b/guide/english/network-engineering/osi-layers/index.md @@ -35,7 +35,7 @@ In the diagram above, to the extreme left is the unit of data that is used in ea * _**Layer 3 - Network Layer:**_ The network layer is responsible for forwarding packets to other networks. Usually, a network is divided into multiple subnets and the network layer with the help of routers forwards packets between such networks to establish a Wide Area Network (WAN). -* _**Layer 4 - Transport Layer:**_ The transport layer ensures that messages are delivered error-free, in sequence, and with no losses or duplications. It relieves the higher layer protocols from any concern with the transfer of data between them and their peers. +* _**Layer 4 - Transport Layer:**_ The transport layer ensures that messages are delivered error-free, in sequence, and with no losses or duplications. It relieves the higher layer protocols from any concern with the transfer of data between them and their peers. On this layer have 2 protocols, TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). * _**Layer 5 - Session Layer:**_ The session layer allows session establishment between processes running on different stations.