Section 10 Chapter 59 - TCP/IP, standard application later protocols
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Layers of TCP/IP (4)
• Application • Transport • Network • Link
Application layer
Selects the protocol for the communication and adds the data to the packet
Transport layer
Establishes a connection and splits the data into packets. Adds the port to the packets
Network layer
Adds the source and destination ip addresses
Link layer
The physical connection. Adds the source and destination MAC addresses to the packet. note: these are not the original source and final destination addresses but rather the addresses for one specific hop, which there may be many of
MAC address
12 digit hex code that uniquely identifies a network device
Socket
A IP address and a port. It specifies a device AND application
FTP port
20
FPT control instructions port
21
SSH port
22
Telnet port
23
Simple mail transfer protocol port
25
HTTP port
80 and 8080
POP3 port
110
IMAP port
143
HTTPS port
443
What is FTP
A protocol for transferring files across a network
What is SSH
A protocol for remotely accessing and managing a computer
How other protocols can be used with SSH
A SSH client can make a TCP connection to a remote port and execute commands from other protocols such as GET from HTTP
Use of SMTP
Transferring outgoing emails and emails from server to server
How a sever functions with POP3
Will send you the email and then delete it from the server, which is a problem when accessing with multiple devices
How a server functions with IMAP
Will send you the email but retain a copy on the server
Role of a web server
Serving up web pages to clients via http
Role of browser
Retrieves web pages and resources and then renders them