2.1 Common Network Ports - CompTia A+ 220-1101

What is required to connect to a server for network communication?

Knowledge of the port number of the service running on that device.

What is the purpose of well-known port numbers?

They are used to configure firewall rules to control traffic by adding an IP address and a corresponding port number.

What does FTP stand for and what is its primary purpose?

FTP stands for File Transfer Protocol, used for transferring files and managing file systems.

What are the port numbers used by FTP?

TCP Port 20 for active mode data transfer and TCP Port 21 for control connection.

What authentication methods does FTP commonly use?

Username and password; some servers allow anonymous logins.

What is the main purpose of SSH?

Provides secure access to the command line of a remote device.

Which port number is associated with SSH?

TCP Port 22.

What makes SSH more secure compared to Telnet?

SSH uses encrypted communication.

What is the primary purpose of Telnet?

Provides console or terminal access to devices using a text-based interface.

What port number does Telnet use?

TCP Port 23.

What is a major security concern with using Telnet?

Unencrypted communications make it insecure.

What does SMTP stand for and what is its primary purpose?

SMTP stands for Simple Mail Transfer Protocol, used to send emails between devices.

What port number does SMTP use?

TCP Port 25.

What is the function of DNS?

Converts fully qualified domain names into IP addresses.

What port number is utilized by DNS?

UDP Port 53.

What is the purpose of DHCP?

Automatically assigns IP addresses and other network configuration settings to devices.

What are the port numbers associated with DHCP?

UDP Port 67 for server-side and UDP Port 68 for client-side.

What functionality does DHCP provide?

Real-time IP address assignments with a lease time and IP address reservations based on MAC addresses.

What is HTTP and its primary purpose?

HTTP stands for Hypertext Transfer Protocol, used for web browsing, transmitting data between client and web server.

Which port number is associated with HTTP?

TCP Port 80.

What is the purpose of HTTPS?

Secure version of HTTP with encrypted data transmission.

What port number does HTTPS use?

TCP Port 443.

What does POP3 stand for and what is its main function?

POP3 stands for Post Office Protocol version 3, used to retrieve emails from a server.

What port number is used by POP3?

TCP Port 110.

What is a limitation of POP3?

Lacks synchronization capabilities across multiple devices.

What does IMAP stand for and what is its primary purpose?

IMAP stands for Internet Message Access Protocol version 4, used to retrieve and synchronize emails across devices.

What port number does IMAP use?

TCP Port 143.

What is SMB and its primary function?

SMB stands for Server Message Block, a protocol for file and printer sharing, primarily associated with Windows.

What port number is associated with SMB?

TCP Port 445 for direct SMB over IP.

What are the port numbers associated with SNMP?

UDP Port 161 for queries and UDP Port 162 for SNMP traps.

What does SNMP stand for?

SNMP stands for Simple Network Management Protocol.

What is the purpose of SNMP?

Monitors and manages network devices.

What are the versions of SNMP and a key feature of each?

SNMPv1: Basic single queries, no security; SNMPv2: Bulk data transfer, still unsecured; SNMPv3: Enhanced security with encryption.

What does LDAP stand for and what is its function?

LDAP stands for Lightweight Directory Access Protocol, used to access directory services like Microsoft Active Directory.

Which port number is associated with LDAP?

TCP Port 389.

What is RDP and what is its purpose?

RDP stands for Remote Desktop Protocol, which provides remote desktop access to Windows machines.

What port number is used by RDP?

TCP Port 3389.

What functionality does RDP provide?

Allows full control of the desktop or access to specific applications and supports various operating systems as RDP clients.

What is a network protocol?

A set of rules governing the exchange of data between devices.

What protocol is used for securely accessing network devices?

SSH (Secure Shell) is used for secure remote access.

What is NAT?

Network Address Translation; a method for remapping an IP address space.

What does VPN stand for?

Virtual Private Network; it extends a private network across a public network.

What is the function of a firewall?

Controls incoming and outgoing network traffic based on security rules.

What does DHCP provide to devices?

Dynamic assignment of IP addresses and network configuration.

What is a subnet mask?

A 32-bit number that divides an IP address into network and host portions.

What is a MAC address?

A unique identifier assigned to network interfaces for communications at the data link layer.

What is the function of a gateway in a network?

Acts as an access point to another network, often providing translation between different protocols.

What does the acronym WLAN mean?

Wireless Local Area Network, allowing devices to connect and communicate wirelessly.