Ports and Protocols

Question 1

Port

Answer 1

Logical communication endpoint that exists on a computer or server

Question 2

Inbound Port

Answer 2

Logical communication opening on a server that is listening for a connection with a client. I.e Port 443

Question 3

Outbound Port

Answer 3

Logical communication opening created on a client in order to call a server that is listening for a connection.

Open a random high port, I.e. 51233, and send request to web server (port 443)

Connect over secure shell protocol (ssh)

Question 4

Port # Range

Answer 4

0 - 65,535

Question 5

Well Known Ports

Answer 5

0 - 1023 are WKPs and are assigned by the Internet Assigned Number Authority (IANA)

Question 6

IANA

Answer 6

Internet Assigned Number Authority

Question 7

Registered Ports

Answer 7

1024 - 49,151 are usually assigned to proprietary protocols for vendor use. Registered with IANA.

Question 8

Dynamic and Private Ports

Answer 8

49,152 - 65,535 can be used by an application wi the out being registered with IANA.

Used in gaming, instant messaging, and chats for connection

Question 9

Protocol

Answer 9

Defined set of rules governing device communication and data exchange

Question 10

FTP

Answer 10

File Transfer Protocol
TCP
Port 21
Used to transfer files from host to host

Question 11

SSH

Answer 11

Port 22
TCP
Provides secure remote terminal access and file transfer capabilities

Question 12

SCP

Answer 12

Port 22
TCP
Provides secure copy function

Question 13

SFTP

Answer 13

Port 22
TCP
Provides secure file transfers

Question 14

Telnet

Answer 14

Port 23
TCP
Provides insecure remote control of another machine using a text-based environment

Question 15

SMTP

Answer 15

Simple Mail Transfer Protocol
Port 25
TCP
Provides ability to send emails over network

Question 16

DNS

Answer 16

Domain Name System
Port 53
TCP, UDP
Translates domain names to IP addresses

Question 17

TFTP

Answer 17

Trivial File Transfer Protocol
Port 69
UDP
Used as a lightweight file transfer method for sending configuration files or network booting of an operating system

Question 18

HTTP

Answer 18

Hypertext Transfer Protocol
Port 80
TCP
Used for insecure web browsing

Question 19

Kerberos

Answer 19

Port 88
UDP
Network authentication protocol

Question 20

POP 3

Answer 20

Post Office Protocol Version 3
Port 110
TCP responsible for retrieving emails from a server

Question 21

NNTP

Answer 21

Network News Transfer Protocol
port 119
TCP
Used for accessing news groups

Question 22

RPC

Answer 22

Remote Procedure Call
Port 135
TCP/UDP
Facilitates communication between different system processes

Question 23

NetBIOS

Answer 23

Ports 137, 138, 139
TCP, UDO
Networking protocol suite

Question 24

IMAP

Answer 24

Internet Message Access Protocol
Port 143
TCP
Allows access to email messages on a server

Question 25

IMAP

Answer 25

Internet Message Access Protocol Port 143 TCP Allows access to email messages on a server

Question 26

TCP

Answer 26

Transmission Control Protocol - Requires established connection before transmitting data - can sequence data (send in specific order) - Data retransmission - can retransmit if packets fail to arrive -guaranteed deliver -thorough error checking guarantees data arrives in its intended stay -broadcasting not supported -slow, but complete deliver

Question 27

UDP

Answer 27

User Datagram Protocol -No connection needed to start and end a data transfer - cannot sequence or arrange data - no data retransmitting, lost data cannot be received - delivery not guaranteed - minimal error-checking covers the basics but may not prevent all errors -broadcasting is supported -speed is fast, but at risk of incomplete data delivery

Question 28

SNMP

Answer 28

Simple Network Management Protocol Port 162 UDP Managed network devices

Question 29

SNMP Trap

Answer 29

Port 162 UDP Responsible for sending SNMP trap messages

Question 30

LDAP

Answer 30

Lightweight Directory Access Protocol port 388 Facilitates directory services

Question 31

HTTPS

Answer 31

HTTP Secure (HTTPS) Port 443 Provides secure web communication

Question 32

SMB

Answer 32

Server Message Block Port 445 Used for file and printer sharing over a network

Question 33

SMTPS

Answer 33

Simple Mail Transfer Protocol Secure Port 465 587 TCP Provides secure SMTP communication Use SSL, TLS, or TCP connection

Question 34

Syslog

Answer 34

Port 514 UDP Used for sending log messages

Question 35

LDAPS

Answer 35

LDAP Secure Port 636 TCP LDAP communication over SSL/TLS

Question 36

IMAPS

Answer 36

Internet Message Access Protocol over SSL or TLS Port 993 TCP Used for secure email retrieval

Question 37

POP3S

Answer 37

Post Office Protocol Version 3 over SSL/TLS Port 995 TCP Used for secure email retrieval

Question 38

Microsoft SQL

Answer 38

Port 1433 TCP Used to facilitate communication with Microsoft SQL server

Question 39

RADIUS TCP

Answer 39

Ports 1645 and 1646 TCP Used for remote authentication, authorization, and accounting

Question 40

RADIUS UDP

Answer 40

Ports 1812 and 1813 UDP Used for authentication and accounting as defined by Internet Engineering Task Force (IETF)

Question 41

RDP

Answer 41

Remote Desktop Protocol port 3389 TCP Enables Remote Desktop access

Question 42

Syslog TLS

Answer 42

Port 6514 TCP Used in secure Syslog that uses SSL/TLS to encrypt the IP packets using a certificate before sending them across the IP network to the Syslog collector

Question 43

TLS

Answer 43

Transport Layer Security Encrypts all data sent over the TCP connection Encryption is performed at the TCP socket layer, not at the application layer.