port numbers

Question 1

Ports 20 and 21

Answer 1

File Transfer Protocol (FTP). FTP is for transferring files between a client and a server.

Question 2

Port 22

Answer 2

Secure Shell (SSH). SSH is one of many tunneling protocols that create secure network connections.

Question 3

Port 25

Answer 3

Simple Mail Transfer Protocol (SMTP). SMTP is used for email.

Question 4

Port 53

Answer 4

Domain Name System (DNS). DNS is an essential process for the modern Internet; it matches human-readable domain names to machine-readable IP addresses

Question 5

Port 67 and 68

Answer 5

DHCP (UDP) DHCP allows hosts to obtain required TCP/IP configuration information from a DHCP server

Question 6

Port 69 (nice)

Answer 6

TFTP Trivial File Transfer Protocol (TFTP) is a simple protocol for exchanging files between two TCP/IP machines. TFTP servers allow connections from a TFTP Client for sending and receiving files. The TFTP protocol supports only file send and receive operations.

Question 7

Port 80

Answer 7

Hypertext Transfer Protocol (HTTP). HTTP is the protocol that makes the World Wide Web possible.

Question 8

Port 110

Answer 8

POP3 “110 year old pops” is the most commonly used protocol for receiving email over the internet.

Question 9

Ports 137/139

Answer 9

NetBIOS/NetBT

Question 10

Port 143

Answer 10

(IMAP) Internet Message Access Protocol is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection.

Question 11

Ports 161 and 162

Answer 11

SNMP Simple Network Management Protocol is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks and for modifying that information to change device behaviour. Devices that typically support SNMP include cable modems, routers, switches, servers, workstations, printers, and more

Question 12

Port 389

Answer 12

LDAP (Lightweight Directory Access Protocol) LDAP is an open, vendor-neutral application protocol for accessing and maintaining that data. LDAP can also tackle authentication, so users can sign on just once and access many different files on the server. LDAP is a protocol, so it doesn’t specify how directory programs work.

Question 13

Port 443

Answer 13

HTTP Secure (HTTPS). HTTPS is the secure and encrypted version of HTTP. All HTTPS web traffic goes to port 443. Network services that use HTTPS for encryption, such as DNS over HTTPS, also connect at this port.

Question 14

Port 445

Answer 14

SMB/CIFS, TCP, both server message blocks, (CIFS) Protocol is a dialect of SMB, (SMB) enables file sharing, printer sharing, network browsing, and inter-process communication (through named pipes) over a computer network. SMB serves as the basis for Microsoft’s Distributed File System implementation.

Question 15

Port 3389

Answer 15

RDP Remote Desktop Protocol. RDP enables users to remotely connect to their desktop computers from another device.