Comptia A+ 1101 2.1 Exam Course Objectives

Описание: 2.1 Compare and contrast Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) ports, protocols, and their purposes

2.0 Networking This is an extremely important part, not just for this test, but if you wish to have a higher level of knowledge and comprehension of the IT world

Transport Layer = TCP/ UDP

Port Numerical label assigned to an application or process helps direct traffic.

Port Numbers/Categories: 0 - 65,535 Well Known 0 – 1023 Registered Ports 1024 - 49,151 Dynamic/Private 49,152 - 65,535

Protocols: Rules and Regulations

Protocols Ports

TCP Transmission Control Protocol
-Connection-Oriented
-Reliable Delivery
-Flow Control
-Error Checking
-Congestion Control
-(Three-way handshake)
(Slower more reliable)

UDP User Datagram Protocol
-Connectionless
-Unreliable
-Faster (less overhead)
-No Error Checking
(Faster less reliable)

FTP File Transport Protocol Port # 20/21 Protocol: TCP
-Transfer files between a client and a server over a network

-Used for uploading and downloading files to and from a server

SSH Secure Shell Port # 22 Protocol: TCP
-Provides a secure channel via encryption, authentication, data integrity…

-Remote login, file transfer, tunneling

Telnet (older technology) Port # 23 Protocol: TCP
-Not Secured

-Remote access

SMTP Simple Mail Transfer Protocol Port # 25 Protocol: TCP
-sending emails between servers

DNS Domain Name System Port # 53 Protocol: TCP/UDP
-website name to ip address

www.internet.com - 127.198.1.1

DHCP Dynamic Host Configuration Protocol Port # 67/68 Protocol: UDP
Network protocol that automatically assigns IP addresses and other network configurations

Networking:
Networking in IT refers to the process of interconnecting computing devices, such as computers, servers, and network devices, to enable the sharing of resources and communication. This involves creating a structured infrastructure using hardware (routers, switches, cables) and software (protocols, operating systems) to facilitate the exchange of data.

HTTP Hypertext Transfer Protocol Port # 80 Protocol: TCP
Used for transferring data on the world wide web defines how messages are formatted and transmitted.

POP3 Post Office Protocol 3 Port # 110 Protocol: TCP
Receiving email: downloadable email, meaning emails are download to the user’s computer and typically deleted from the server.

NetBIOS / NetBT Network Basic Input/Output System Port # 137/139 Protocol: TCP/UDP
-Legacy Protocol basically name computers and share resources

Largely been replaced by Active Directory
IMAP Internet Mail Access Protocol Port # 143 Protocol: TCP
-receiving email protocol but the difference is the email remains on the server allowing checking email from multiple devices

SNMP Simple Network Management Protocol Port # 161/162 Protocol: UDP
-used for monitoring and managing network devices, it allows network admin to collect information about network devices.

LDAP Lightweight Directory Access Protocol Port # 389 Protocol: TCP/UDP
-accessing and managing directory information, used to store, search, and modify information about individuals, organizations and resources

HTTPS Hypertext Transfer Protocol Secure Port # 443 Protocol: TCP
Secure version of HTTP.

SMB Server Message Block CIFS Common Internet File System , Port # 445 Protocol: TCP
Used for file and printer sharing

RDP Remote Desktop Protocol Port # 3389 Protocol: TCP
Used to provide a graphical user interface (gui) session over a network connection, to remote control a computer.

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