A+ 1101 ports/ protocols

Question 1

Telnet

Answer 1

TCP Port 23,
Main function is to establish connection between sever and a remote computer. Not a secure connection. Enables the remote connection of a computer to be established with routers and switches as well.
Application layer

Question 2

SMTP

Answer 2

TCP/IP protocol,
Port 25 for SMTP port relays,
Today now uses 587.
An outdated port is 465
Simple Mail Transfer Protocol, used in sending and receiving e-mail securely. used in the application layer. Can also deliver messages between different networks

Question 3

IMAP

Answer 3

TCP protocol, Port 143,
Internet Message Access Protocol.
by default a non-encrypted port.
Allows you to access your email from a remote server from any devices
Application Layer

Question 4

DNS

Answer 4

Port 53 of TCP and UDP,
Domain name sever,
Turns Domain names into IP addresses
Application layer

Question 5

RDP

Answer 5

Port 3389 of the TCP protocol,
Remote Desktop Protocol,
Allows users to remotely connect and mange a computer

Question 6

DHCP

Answer 6

UDP Port 67 for Server,
UDP Port 68 for Clients,
Dynamic Host Configuration Protocol,
Assigns IP addresses to network endpoints so they can communicate with other network endpoints over IP
Application layer

Question 7

TCP and UDP

Answer 7

Are main protocols which are used during the transport layer of TCP/IP
UDP is used in situations where the volume of data is large and security of data is not of much significance, think video call.
Conectionless
TCP is used in those situations where security of data is one of the main issues. Connection-Oriented

Question 8

HTTP

Answer 8

Port 80, TCP protocol
Hypertext Transfer Protocol,
Most widely used ports,
Allows the browser to connect to the web pages on the internet.
Web asks for a connection then once a connection is made you get privilege to connect to the world wide web.
Application layer

Question 9

HTTPS

Answer 9

Port 443, TCP protocol,
Lets you connect to the internet by establishing a connection between the webpages and the browser. However this port added a feature of security to it which HTTP does not have.

Question 10

FTP

Answer 10

File transfer Protocol,
Transfers files over the internet. Lays down rules for transfer of data, also asks for authentication by the user before the transfer of data.
Application layer
Port 20 performs the task of forwarding and transferring of data
Port 21 performs the task of signalling for FTP. It listens to all of the commands and provides a flow control for data.

Question 11

POP3

Answer 11

Port 110, TCP protocol,
It allows the email messages to be retrieved from the the SMTP servers.You will download the messages in order to read them. Messages deleted from sever when downloaded.
Application layer

Question 12

SSH

Answer 12

Port 22, TCP protocol
Secure Shell,
Carries out the task of remotely connecting to a remote server or host. Also allows you to execute commands and move your files remotely. SECURE: sends files in an encrypted form.
Application later

Question 13

SNMP

Answer 13

Port 161 and port 162
Simple Network Management Protocol,
a networking protocol used for the management and monitoring of network-connected devices in Internet protocol networks
Manager sends commands down with port 161. The agent sends reports or responds to commands with port 162

Question 14

ARP

Answer 14

Address Resolution Protocol, Connects an ever-changing IP address to a fixed physical machine address, in a local-area network

Question 15

NetBIOS/ NetBT

Answer 15

Network Basic Input/ Output System.
3 services
Name service for registration and resolution Ports 137 for both UDP and TCP
Datagram distribution service for connectionless communication Port 138 UDP
Session service for connection-oriented communication Port 139 TCP

Question 16

LDAP

Answer 16

Port 389 - default port for unencrypted communication.
Port 636 is the encrypted counterpart
Lightweight Directory Access Protocol.
Used to lookup information or devices within a network.

Question 17

CIFS

Answer 17

Port 445
Common Internet File System.
Allows clients to communicate with servers and access file sharing and print services as if they were stored locally.

Question 18

SMB

Answer 18

Port 445,
Server Message Block,
Allows devices to share file, printers, and other resources over a network by establishing a client-server relationship, where the client sends a request to the server and the server responds