Ports

Question 1

20, 21

Answer 1

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

Question 2

22

Answer 2

Secure Shell SSH (Port 22)
▪ Cryptographic network protocol for operating network services securely over an unsecured network
▪ Best known for remote login to computer systems by users

SSH File Transfer Protocol SFTP (Port 22)
▪ Provides file access, file transfer, and file management over any reliable data stream

Question 3

23

Answer 3

Telnet (Port 23)
▪ Provides bidirectional interactive text-oriented communication facility using a virtual terminal connection
▪ Like SSH, but insecure

Question 4

25

Answer 4

Simple Mail Transfer Protocol SMTP (Port 25)
▪ Internet standard for sending electronic mail
▪ RFC 821 was defined originally in 1982
▪ RFC 5321 developed in 2008 (current version)

Question 5

53

Answer 5

Domain Name Service DNS (Port 53)
▪ 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 6

69

Answer 6

Trivial File Transfer TFTP (Port 69)
▪ 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 7

80

Answer 7

Hyper Text Transfer HTTP (Port 80)
▪ Foundation of data communication for WWW
▪ Designed for distributed, collaborative, and hypermedia presentation across many devices

Question 8

110

Answer 8

Post Office Protocol v3 POP3 (Port 110)
▪ Used by local e-mail clients to retrieve e-mail from a remote server over
TCP/IP connection

Question 9

123

Answer 9

Network Time Protocol NTP (Port 123)
▪ Provides clock synchronization between computer systems over packet- switched, variable-latency data networks
▪ Created in 1985, one of the oldest Internet protocols in current use

Question 10

139

Answer 10

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

Question 11

143

Answer 11

Internet Mail Application IMAP (Port 143)
▪ 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 12

389

Answer 12

Lightweight Directory Access LDAP (Port 389)
▪ Open, vendor-neutral, industry standard for accessing and maintaining
distributed directory information services
▪ LDAP and Active Directory use this port

Question 13

443

Answer 13

HTTP Secure HTTPS (Port 443)
▪ Foundation of ecommerce on WWW
▪ Designed for adding security to the insecure HTTP protocol

Question 14

445

Answer 14

Server Message Block SMB (Port 445)
▪ Provides shared access to files, printers, and miscellaneous communications between devices on a network

Question 15

514

Answer 15

System Logging Protocol Syslog (Port 514)
▪ Used to send logging data back to a centralized server

Question 16

587

Answer 16

Simple Mail Transfer Protocol Transport Layer Security SMTP TLS (Port 587)
▪ Secure and encrypted way to send emails

Question 17

636

Answer 17

LDAP Secure LDAPS (Port 636)
▪ Open, vendor-neutral, industry standard for accessing and maintaining distributed directory information services Provides secure directory services

Question 18

993

Answer 18

Internet Message Access Protocol over SSL IMAP over SSL (Port 993)
▪ Secure and encrypted way to receive emails

Question 19

995

Answer 19

Post Office Protocol Version 3 over SSL POP3 over SSL (Port 995)
▪ Secure and encrypted way to receive emails

Question 20

1433

Answer 20

Structured Query Language Server Protocol SQL (Port 1433)
▪ Used for communication from a client to the database engine

Question 21

1521

Answer 21

SQLnet Protocol (Port 1521)
▪ Used for communication from a client to an Oracle database

Question 22

3306

Answer 22

MySQL (Port 3306)
▪ Used for communication from a client to the MySQL database engine

Question 23

3389

Answer 23

Remote Desktop Protocol RDP (Port 3389)
▪ 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 24

161, 162

Answer 24

Simple Network Management SNMP (Port 161)
▪ 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 25

67, 68

Answer 25

Dynamic Host Control DHCP (Port 67, 68)
▪ 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 26

5060, 5061

Answer 26

Session Initiation Protocol SIP (Port 5060, 5061)
▪ Provides signaling and controlling multimedia communication sessions in applications
▪ Used for Internet telephony for voice and video calls, VOIP, and instant messaging