NETWORK CLASSES

Network classes

Class Leading bit Decimal range Max networks Max host

A 0 1 - 127 127 16,777,214
B 10 128 - 191 16,384 65,534
C 110 192 - 223 2,097,152 254
D 111 224 - 239
E 1111 240 - 255

Transport Layer

Transport Layer
Purpose of Transport Layer
Tracks Individual Communications
Segments and manages each piece of data
Reassembles the data
Identifies the different applications

Applications do not need to know the operational details of the network.

The Transport layer keeps track of what data goes where, and from what application by using port numbers.

The transport layer helps with segmenting and multiplexing.

All transport layer protocols handle
Segmentation and Reassemble
Conversation Multiplexing: Many applications on each host in the network

Each Application is assigned an address known as a port.
Well Known Ports
22 SSH
23 Telnet
25 SMTP
53 DNS
80 HTTP
69 TFTP
67 DHCP

Well known ports

Well Known Ports
22 SSH
23 Telnet
25 SMTP
53 DNS
80 HTTP
69 TFTP
67 DHCP