Network +: 1.1 Protocols and Ports Flashcards
SSH
22
DNS
53
SMTP
25
SFTP
22
FTP
20,21
TFTP
69
TELNET
23
DHCP
67,68
HTTP
80
HTTPS
443
SNMP
161
RDP
3389
NTP
123
SIP
5060, 5061
SMB
445
POP
110
IMAP
143
LDAP
389
LDAPS
636
H.323
1720
Secure Shell
cryptographic protocol that is used remotely administer Linux server and network equipment through a text console. Securely log in without risk of password transmission in clear text. Incoming requests on TCP port 22. Common practice for cloud providers to use SSH for authentication of admins.
Domain Name Services
A distributed directory of domain resource records. Used in translating fully qualified domain names to IP addresses. Also used other lookups such as IP addresses to FQDNs for locating services such as Lightweight Directory Access Protocol servers. Operate on UDP port 53 for simple lookups and TCP port 53, or zone transfer, for data replication
Simple Mail Transport Protocol
Used by mail transfer agents to deliver emails to a destination email server. Process delivering the email to the email server. Other protocols such as Internet Message Access Protocol and Post Office Protocol on the email server are responsible for client access. Operates on TCP port 25
Secure File Transfer Protocol
A file transfer protocol that uses the SSH inner workings. When SSH is installed on a system like Linux, SFTP is automatically enabled to transfer files. Command used is “scp”, which stands for Secure Copy Protocol. Awaits an incoming connection on TCP port 22
File Transfer Protocol
Legacy file-sharing protocol that is still commonly used on the Internet. SFTP replacing FTP because encryption. Consists of control channel and data channel. Operates in active and passive modes.
