< All CompTIA A+ Notes

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

By: sgirvin | Related Course: CompTIA A+ | Published: December 20, 2017 | Modified: December 20, 2017
Join Cybrary

NotepadCommunication Protocols: TCP

TCP – Transmission Control Protocol

-Header is 20 bytes

-Connection Oriented Protocol(Makes sure the packets get there and numbers them in order) Sends one packet and waits for conformation before sending another packet. Has error checking!!

-Three way handshake/Ending handshake

-Packets stream(can cut packets whenever it wants, doesn’t have to be full packets at once) can always resend packets

-Good for files or text documents


NotepadCommunication Protocols:UDP

UDP- User Datagram Protocol

+smaller packets then TCP 

+Packet Header is only 8 bytes

+Connectionless protocol doesn’t make sure the packets make it. (Just keeps sending) no error checking

+Sends in logical chunks

+Good for streaming 

 

 

 

 

 

 


NotepadNetworking Protocols

Networking Protocols

+Needs to know if it is in TCP or UDP 

+What port is it traveling over

 

 


NotepadNetworking Protocols: Telnet, SMPT, POP3 & IMAP

-Telnet- Port 23- UDP/TCP

+Remote terminal

+Insecure

-SMTP – Port 25- TCP (Sending Emails)

+Simple Mail Transfer Protocol (Emails)

-POP3- Port 110 – TCP (Downloading Emails)

+Post Office Protocol 3

+Doesn’t send Email but does receive Emails by downloading the email from server to client via program.

+Will delete Email from server after client receives mail but can be configured to retain the information of both sides. 

-IMAP – Port 143 – TCP (Downloading Emails)

+Downloads message from server to client but will also keep a copy on the server.

+More robust and has more fetchers then POP3

 


NotepadNetworking Protocols:DNS, HTTP & HTTPS

-DNS- Port 53- TCP/UDP most of the time UDP (Domain Name Service)

+FQDN to IP(Fully Qualified Domain Name)

+www.google.com to 10.1.17.9

-HTTP-Port 80- TCP (Hyper Text Transfer Protocol)

+Send/Receive Command/Info to web servers

+Uses Clear Text that’s insecure(Anyone can see the information over your network with programs such as wireshark)

-HTTPS-Port 443- TCP

-Secure

-HTML(Hyper Text Markup Language)

+The language of the internet <body>, <P>, Link address exe.. 

 


NotepadNetworking Protocols:FTP, TFTP & SFTP

*Need to know  that protocols go with what ports

-FTP- Port 21- TCP (File Transfer Protocol)

+File Transfer Protocol(No coding protocols) just sent over the net

+File Transfer w/minimal overhead

-TFTP-Port 69- UDP (Trivial File Transfer Protocol)

+sometimes set to multiple clients at once

-SFTP-Port 22- TCP

+Secure File Transfer Protocol (Is encrypted)

+SSH Encryption (requires encryption keys on both sides)

 

 


NotepadNetworking Protocols:RDP Remote Desktop

 RDP- Port 33389- TCP/UDP

+Remote Desktop (Windows OS)


NotepadOther Protocols: DHCP,LDAP,SNMP,SMB/CIFS & SSH

-DHCP (Dynamic Host Configuration Protocol)

+Automatically allows our computer to receive a IP, subnet mask, DNS & other settings

-LDAP (Lightweight Directory Access Protocol)

+Connect w/Directory Servers (Active Directory)

-SNMP (Simple Network Management Protocol)

+Allows us to connect with several different devices… switches/router/printer/exe.

-SMB/CIFS (Sever Message Block/Common Internet File System)

+Allows us to connect to servers and access files exe.

+Mainly used for File servers

-SSH (Secure Shell)

+encrypted using shared keys between client and server

+Command Line Control over a system


NotepadPorts

Port 

-65,535 ports

-192.168.1.4:80 (80 is the port) just like teamspeak

-Allows us to have multiple network connections over one network.

Different Layers(Our ports work on the Transport layer)

-Application

-Transport

-Network

-Link

-Physical


< All CompTIA A+ Notes
Join Cybrary

Our Revolution

We believe Cyber Security training should be free, for everyone, FOREVER. Everyone, everywhere, deserves the OPPORTUNITY to learn, begin and grow a career in this fascinating field. Therefore, Cybrary is a free community where people, companies and training come together to give everyone the ability to collaborate in an open source way that is revolutionizing the cyber security educational experience.

Support Cybrary

Donate Here to Get This Month's Donor Badge

 
Skip to toolbar

We recommend always using caution when following any link

Are you sure you want to continue?

Continue
Cancel