CompTIA A+ 220-1101 - Core 1 - Intro into IP

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What protocols use TCP

FTP - SSH - Telnet - HTTP - HTTPS POP3 - IMAP4 - SMB - LDAP - RDP NetBios (session service)

What is FTP?

File Transfer Protocol - tcp/20 (active mode data) - tcp/21 (control) - Transfers files from one device to another - Authenticates with a username and password - Some systems use a generic/anonymous login - Full-featured functionality - List, add, delete, etc.

What is HTTP?

Hypertext Transfer Protocol - tcp/80 - used for transmitting web pages.

What is HTTPS?

Hypertext Transfer Protocol Secure - secure version of HTTP. - tcp/443

What is IMAP4?

Internet Message Access Protocol v4 - tcp/143 • RECEIVE emails from an email server - Email inbox management from multiple client

What is IP?

Internet Protocol - An addressing system that finds paths to distant computers

What is LDAP?

Lightweight Directory Access Protocol - tcp/389 - Store and retrieve information in a network directory - Commonly used in Microsoft Active Directory

What is NetBios?

Network Basic Input/Output System - udp/137- NetBIOS name services (nbname) - tcp/139 - NetBIOS session service (nbsession)

What is POP3?

Post Office Protocol 3 - tcp/110 • RECEIVE emails from an email server - Authenticate and transfer - Not built for multiple email clients - Basic mail transfer functionality - In order to synchronize all these clients we use IMAP4

What is RDP?

Remote Desktop Protocol - tcp/3389 • Remotely access another computer

What is SSH?

Secure Shell - tcp/22 - Secure terminal connection - Looks and acts the same as Telnet

What is SMB?

Server Message Block - tcp/445 - Protocol used by Microsoft Windows - File sharing, printer sharing - Also called CIFS (Common Internet File System)

What is SNMP?

Simple Network Management Protocol • Gather statistics from network devices - udp/161 Queries - udp/162 Trap

What is DHCP?

- Dynamic Host Configuration Protocol • Automated configuration of IP address, subnet mask and other options - udp/67 - udp/68

What protocols use UDP

DNS - DHCP SNMP Query - SNMP Trap NetBIOS (name service)

What is DNS?

Domain Name System - udp/53 - Converts names to IP addresses - www.fakewebsite.com = 162.159.246.165

What is Telnet?

Telecommunication Network - tcp/23 - Login to devices remotely - Insecure terminal connection - Not the best choice for production systems

What is TCP?

Transmission Control Protocol - Connection-oriented (open/close to the connection) - "Reliable" delivery - Recovery from errors - Flow control

What is UDP?

User Datagram Protocol • Connectionless (No open/close to the connection) - "Unreliable" delivery (doesn't mean it doesn't work) - No error recovery - No reordering of data or retransmissions - No flow control

What is the difference between static/reserved and dynamic/pooled DHCP?

When a device is assigned a static/reserved IP address, the address does not change. Most devices use dynamic/pooled IP addresses, which are assigned by the network when they connect and change over time.

What is SMTP?

• SMTP - Simple Mail Transfer Protocol - Server to server email transfer - tcp/25 • Also used to SEND mail from a device to a mail server - Commonly configured on mobile devices and email clients


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