Ports and functions Flashcards
What are the 2 groups of ports and what are their ranges?
- “Well known and reserved”(0-1023)- standard ports
- Epehemeral Ports (Ports 1024-65,535)-Temporary Ports
What range do ports range from?
0-65,535
What is FTP, FTP’s function and port numbers? (2 Port #s)
File Transfer Protocol (Ports 20,21)
Transfers computer files between a client and server on a computer network. This is an unsecure method and data is being transferred in the clear. ( no encryption)
-Not used for anything confidential on encrypted
What is SSH, SSH’s function and port number?
Secure Shell (SSH)- Port 22- Cryptographic network protocol for operating network services securely over an unsecured network and is best known for remote login to computer systems by users.
- Safe to use over unsecured network
- Encryption on both ends
What is SFTP, SFTP’s function and port #?
SSH File Transfer Protocol (SFTP)-Port 22- Provides file access, file transfer, and file management over any reliable data stream.
- Secure version of FTP
- Uses the FTP protocol through the SSH tunnel that we created to securely transfer files
What is TELNET, TELNET’s function, and port #?
Telnet- Port 23- Provides bidirectional interactive text-oriented communication facility using a virtual terminal connection. Similar to SSH, but insecure.
- version of remote access with no security
- Doesn’t use encryption/UNSECURE
What is SMTP, SMTPs function and port#?
Simple Mail Transfer Protocol (SMTP)-Port 25- Internet standard for sending electronic mail
-Sending mail out over port 25
What is DNS, DNS function, and Port #?
Domain Name Service (DNS)-Port 53- Hierarchical, decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It converts domain names to IP addresses.
192.168.1.12->www.google.com
What is DHCP, DHCPs function and port#? (2 Ports)
Dynamic Host Control Protocol (DHCP)-Port 67, 68- Dynamically assigns an IP address and other network configuration parameters to a client and enables computers to request IP addresses and networking parameters automatically.
-automatically assigns computer IPs over ports 67, 68
What is TFTP, TFTPs function and port#?
Trivial File Transfer Protocol (TFTP)-Port 69- Transmits files in both directions of a client-server application and is used for booting an operating system from a local area network file server
- doesn’t provide and authentication or directory visibility
- Stripped down version of FTP
- used in sending or requesting configuration files from a router or switch, or booting an OS off of network drive
What is HTTP, HTTPs function and port#?
Hypertext Transfer Protocol (HTTP)-Port 80- Foundation of data communication for the world wide web that is designed for distributed, collaborative, and hypermedia presentation across many devices
-Unsecured web browsing
What is POP3, POP3s function and port #?
Post Office Protocol v3 (POP3)-Port 110- used by email clients to retrieve emails from a remote server over TCP/IP connection
-downloading email from server
What is NTP, NTPs function and port#?
Network Time Protocol (NTP)-Port 123- Provides clock synchronization between computer systems over packet-switched, variable-latency data networks
- NTP port 123
- Send out time over network
What is NetBIOS, NetBIOSs function and port #?
NetBIOS-Port 139- Network Basic Input/Output System. Provides services allowing applications on separate computers to communicate over a local area network for file and printer sharing
What is IMAP, IMAPs function and port#?
Internet Mail Application Protocol (IMAP)-Port 143- Allows email clients to retrieve email messages from a mail server over a TCP/IP connection and allows the end user to view and manipulate the messages as if they’re stored locally
- Different from POP3 because it keeps all devices synchronized
(ex: on POP3 if i viewed mail on one device, one device would show read and the other would show unread) - On IMAP all devices would show message read
- Much better for modern email communciation
What protocols do you receive emails on?
What protocol do you sending emails on?
Receive- POP3(port 110) and IMAP(Port 143)
Send- SMTP(Port 25)
What is SNMP, SNMPs function and port #?
Simple Network Management Protocol (SNMP)-Port 161- Provides collection and organization of information about managed devices on IP networks
-used on routers and switches
What is LDAP, LDAPs function and port#?
Lightweight Directory Access Protocol (LDAP)-Port 389- Open, vendor-neutral, industry and standard for accessing and maintaining distributed directory information service
- LDAP and Active Directory both use Port 389
- An Example of using LDAP is looking up a contact in the directory of MS Outlook
What is HTTPS, HTTPSs function and port#?
HTTP Secure (HTTPS)-Port 443- Foundation of ecommerce on the world wide web that is designed for adding security to the insecure HTTP protocol.
-HTTPS uses either TLS or SSL to encrypt your connection to allow for ecommerce, and logging in with username and password
What is SMB, SMBs function and port#? What other protocol does SMB operate in conjunction with?
Server Message Block (SMB)-Port 445-Provides shared access to files, printers, and miscellaneous communications between devices on a network
- operates a lot like NetBIOS(Port 139) and operates in conjunction with NetBios to perform file transfer
- NetBIOS focuses on authentication and SMB passes out files
- Port 139 and 445 are usually open and working together
What is LDAPS, LDAPSs function and port #?
LDAP Secure (LDAPS)- Port 636- open, vendor-neutral, industry standard for accessing and maintaining distributed directory information services
- operates like LDAP
- uses active directory structure
- adds layer of TLS or SSL to secure information
What is RDP, RDPs function and port#?
Remote Desktop Protocol (RDP)-Port 3389- Proprietary protocol developed by MicroSoft which provides a user with a graphical interface to connect to another computer over a network connection
-different from SSH or Telnet because of how the interface looks
What is SIP, SIPs function and port #s? (2 ports)
Session Initiation Protocol (SIP)-Port 5060, 5061- Provides signaling and controlling multimedia communication sessions in applications
-SIP is used for VoIP, phone calls, voices calls, skype,etc..
Port 22 (2 answers)
SSH, SFTP
