Ports and Protocols

Question 1

File Transfer Protocol: FTP
(Port 20,21)

Answer 1

▪ Transfers computer files between a client and server on a computer
network
▪ Unsecure method
▪ Data transferred in the clear

Question 2

Secure Shell: SSH
(Port 22)

Answer 2

Cryptographic network protocol for operating network services securely
over an unsecured network
▪ Best known for remote login to computer systems by users

Question 3

SSH File Transfer Protocol: SFTP
Port 22

Answer 3

▪ Provides file access, file transfer, and file management over any
reliable data stream

Question 4

Telnet (Port 23)

Answer 4

Provides bidirectional interactive text-oriented communication facility
using a virtual terminal connection
▪ Like SSH, but insecure

Question 5

Simple Mail Transfer Protocol: SMTP
Port 25

Answer 5

▪ Internet standard for sending electronic mail
▪ RFC 821 was defined originally in 1982
▪ RFC 5321 developed in 2008 (current version)

Question 6

Domain Name Service: DNS
Port 53

Answer 6

▪ Hierarchical decentralized naming system for computers, services, or
other resources connected to the Internet or a private network
▪ Converts domain names to IP addresses

Question 7

Dynamic Host Control : DHCP
Port 67,68

Answer 7

▪ DHCP server dynamically assigns an IP address and other network
configuration parameters to a client
▪ Enables computers to request IP addresses and networking parameters
automatically?
▪ Reduces burden on network administrators

Question 8

Trivial File Transfer: TFTP
Port 69

Answer 8

Transmits files in both directions of a client-server application
▪ Used for booting an operating system from a local area network file
server
▪ Doesn’t provide user authentication or directory visibility
▪ Essentially a stripped-down version of FTP

Question 9

Hyper Text Transfer: HTTP
Port 80

Answer 9

Foundation of data communication for WWW
▪ Designed for distributed, collaborative, and hypermedia presentation
across many devices

Question 10

Post Office Protocol v3: POP3
Port 110

Answer 10

▪ Used by local e-mail clients to retrieve e-mail from a remote server over
TCP/IP connection

Question 11

Network Time Protocol: NTP
Port 123

Answer 11

Provides clock synchronization between computer systems over packetswitched, variable-latency data networks
▪ Created in 1985, one of the oldest Internet protocols in current use

Question 12

NetBIOS: Port 139

Answer 12

Network Basic Input/Output System
▪ Provides services allowing applications on separate computers to
communicate over a local area network for file and printer sharing

Question 13

Internal Mail Application: IMAP
Port 143

Answer 13

Provides e-mail clients to retrieve e-mail messages from a mail server
over a TCP/IP connection
▪ Allows the end user to view and manipulate the messages as if they’re
stored locally

Question 14

Simple NEtwork Management: SNMP
Port 161

Answer 14

▪ Provides collection and organization of information about managed
devices on IP networks
▪ Can modify that information to change device behavior, commonly used
in network devices

Question 15

Lightweight Directory Access: LDAP
Port 389

Answer 15

▪ Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
▪ LDAP and Active Directory use this port

Question 16

HTTP Secure: HTTTPS
Port 443

Answer 16

Foundation of ecommerce on WWW
▪ Designed for adding security to the insecure HTTP protocol

Question 17

Server Message BLock: SMb
Port 445

Answer 17

Provides shared access to files, printers, and miscellaneous
communications between devices on a network

Question 18

System Logging Protocol: Syslog
Port 514

Answer 18

▪ Used to send logging data back to a centralized server

Question 19

Simple Mail Transfer Protocol Transport Layer Security SMTP TLS (Port 587)

Answer 19

Secure and encrypted way to send emails

Question 20

LDAP Secure LDAPS (Port 636)

Answer 20

Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
Provides secure directory services

Question 21

Internet Message Access Protocol over SSL IMAP over SSL (Port 993)

Answer 21

▪ Secure and encrypted way to receive emails

Question 22

Post Office Protocol Version 3 over SSL POP3 over SSL (Port 995)

Answer 22

Secure and encrypted way to receive emails

Question 23

Structured Query Language Server Protocol SQL (Port 1433)

Answer 23

Used for communication from a client to the database engine

Question 24

SQLnet Protocol (Port 1521)

Answer 24

Used for communication from a client to an Oracle database

Question 25

MySQL (Port 3306)

Answer 25

Used for communication from a client to the MySQL database engine

Question 26

Remote Desktop Protocol RDP (Port 3389)

Answer 26

Proprietary protocol developed by Microsoft
▪ Provides a user with a graphical interface to connect to another
computer over a network connection
▪ User employs RDP client software for this purpose and the other
computer must run RDP server software

Question 27

Session Initiation Protocol SIP (Port 5060, 5061)

Answer 27

▪ Provides signaling and controlling multimedia communication sessions in
applications
▪ Used for Internet telephony for voice and video calls, VOIP, and instant
messaging