Common Ports - CompTIA Network+ N10-009 - 1.4 Flashcards
SSH
Port 22 TCP or UDP. Securely transfer data.
Terminal Access: Works at CMD.
Remote in via command line.
Used by Secure copy protocol (SCP) (port 22), and SFTP (port 22).
Supports tunneling. Takes a protocol and encapsulates it in a SSH connection.
DNS
Domain Name Service
Converts FQDN to IP Address
UDP Port 53.
TCP/53 for large data transfers
Layer 7 TCP/IP protocol.
SMTP
Simple Mail Transfer Protocol
TCP Port 25
Server to Server email transfer
Client to Server email transfer
SFTP
TCP Port 22. Since SFTP runs over the SSH protocol as a subsystem, SFTP uses port 22 by default.
Secure File Transfer Protocol (SFTP) is a network protocol for securely accessing, transferring and managing large files and sensitive data.
Two ways to authticate with SFTP. Password or public key.
can be used for time stamping. records Date and time of, file type and size.
FTP
A service. TCP 20, 21
20 file transfers
21 send commands and responses through CMD.
Not secure.
Used for shared file in corporate network
and data from web servers.
TFTP
Trivial File Transfer Protocol
UDP 69
Used to transfer a small amount of information very quickly. Like a config file from server
TELNET
23 TCP can remote into devices. Not encrypted. Can be done through command line.
Quick remote access.
DHCP
Dynamic Host Configuration Protocol
udp/67, udp/68
Assigns IP address to network devices.
Requires a DHCP server
UDP 7 layer
Uses UDP because service needs to be always open.
HTTP
Hypertext Transfer Protocol
TCP Port 80
Unencrypted.
Web Server communication
HTTPs
Hypertext Transfer Protocol Secure
TCP Port 443
Encrypted over TLS SSL
Web Server communication with encryption
Alternative port for HTTP.
8080
SNMP
Simple Network Management Protocol.
UDP Port 161 and 162 USP.
Monitor network devices performance.
SNMP V3 is most current.
RDP
3389 TCP. Establish connections remotely.
NTP
Network Time Protocol
123 UDP.
Used to sync date and time on all network devices. Always want to have open
Accuracy in atomic or GPC clocks. Used to ensure correct time.
SIP
TCP and UDP. 5060, 5061 Session Initiation Protocol. Enables VOip over IP networks.
SMB
TCP 455
Server Message Block
Provides communication between devices.
POP
110
IMAP
Internet Message Access Protocol.
TCP Port 143. Secure communications.
Allows email clients to access and manage emails stored on a remote mail server
LDAP
TCP 389.
Directory. centralized location we can use to store all info on users and data.
SMTP
25 sents email.
Kerberos
88 TCP or UDP.
Authorization protocol for client server applications.
TACACS+
49 TCP remote authentication
pop3
UDP 110. Post office Protocol. retrieves emails from email servers. 110 receives email. Uses Client Server Architecture.
Only a retrieval protocol.
Not encrypted.
Network socket address
IP address and Port number it is sending or receiving on
192.168.4.24 : 80
ICMP provides
provides info and error reporting to devices.
Windows ssh is called
OpenSSH. A connectivity tool for remote sign-in that uses the SSH protocol
TCP three-way handshake
How TCP establisjed a connectiob between a source and destination.
SYN, SYN-ACK, and ACK
HTTP uses which layer
7
which protocol is http directly encapsulated in?
TCP
Which protocol is DHCP directly encapsulated in?
UDP
TCP
A service. Uses connection oreinted sessions. A beginning and a end to that data transmission connection. Also known as a three way handshake.
HTTPs transfers data in
cipher text (encrypted text)
which protocol is used for info and error erporting
ICMP
What is the purpose of ports
to represent a logical way for traffic to move into and out of a program or service on a machine.
which port do web servers listen for informing traffic and send their own traffic.
Port 80
what is a URL
Uniform Resource Locator, is essentially the address of a web page on the internet.
HTTPS can use which two versions of encryption protocols
SSL or TLS.
Depending on the type of protocol. It will determine the certificates we use.
LDAP SSL
LDAP over SSL, LDAPS
Encrypting the data with (SSL) or newer (TLS).
Port 636
DHCP address are assigned
by mac address in the DHCP server
