< All CompTIA A+ Notes

Raul | CompTIA A+ | Module 2.4 - Common TCP and UDP

By: Raul Pop | Related Course: CompTIA A+ | Published: April 22, 2017 | Modified: April 23, 2017
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NotepadCommunications Protocols:

1) User Data gram Protocol(UDP)

-Sending one by one as a flow data packets

-packets has a header 8 bytes

-error checking

-if connections drop the current packets wont be resend



-send in chunks(logical chunks)


NotepadCommunications Protocols: TCP

1) TCP-Transmission Control Protocol

-header=20 bytes

-Connection Oriented(Send one by one and verified and if its ok the received will confirm its ok)

-error checking

-you have to resend if its corrupted or has errors

-Three way handshake(TCP wont send package until handshake)

-packets stream



NotepadNetworking Protocol

1) FTP-Port default 21(File Transfer Protocol)——->TCP


-use for TCP because you want to get those files without corruption or errors)

-You can use programs to change ports

-file transfer with minimal overhead


2)TFPT-Port Default 69(Trivial File Transfer Protocol)–> UDP


3)SFTP-Port default 22(we cant change)(Secured File Transfer Protocol)–>TCP


-error checking

-SSH Encryption


NotepadNetworking Protocol

1) Telnet-23->UDP/TCP

-remote terminal connection




2)SMTP-25->TCP(Emails/Email files)(Simple Mail Transfer Protocol)

3) POP 3-110-TCP(Post Office Protocol 3)

-we dontsend emails we just download from servers

-we download from server to client(computer)

-can be configured to keep files on bot server>>client 

4)IMAP-143-TCP(Internet Message Access Protocol )

-SERVER-CLIENT download the message and keep the copy on the server

-its more robust then POP 3

-more features

-more usefull




NotepadNetworking Protocol

1) DNS-53-TCP/UDP(Domain Name System)

-translated domain  name address to IP

2) HTTP(Hypertext Transfer Protocol)-80-TCP

-Computer browsers are talking with web servers

-send/receive information 

-get command

-clear text

-can be seen by everyone from internet(wire shark) if you are using 80 port



-use keys


-even if its encrypted you can send information to third parties


NotepadNetworking Protocol

1)RDP-Remote Desktop Protocol-33,389 Port-TCP/UDP

-remote assistance


NotepadNetworking Protocols——->

TCP/UDP—>Networking Protocols( fpt and port 21/location)


NotepadOther Protocols

1)DHCP(Dynamic Host Configuration Protocol)

-automatic network settings


2)LDAP(Lightweight Directory Access Protocol)

-Connect with Directory Servers


3)SNMP(Simple Network Management Protocol)

It is used for collecting information from, and configuring, network devices, such as servers, printers, hubs, switches, and routers on an Internet Protocol (IP) network


-Server Message Block

-Common Int.File System

-share acces to system server

-files server

-print servers

-communicate with file servers

5)SSH(Secure Shell)


-command line control



-65,535 Ports


-transport layer

-5 Layer Diagram







< All CompTIA A+ Notes
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