Ports

A new employee is attempting to configure a cell phone to connect to the email server of the company. Which port number should be selected when using the POP3 protocol to access messages stored on the email server?

110

An employee of a company is attempting to remotely access a computer system using a virtual terminal (vty) session via Telnet. Which destination port number should the employee put in the remote access software being used?

23

A new employee is configuring a cell phone for company email. Once configured, what is the destination port number used when the employee sends an email from the phone?

25

A client device has initiated a secure HTTP request to a web browser. Which well-known port address number is associated with the destination address?

443

What is the well-known port address number used by DNS to serve requests?

53

A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?

DNS

Post Office Protocol version 3 (POP3)

TCP 110

Internet Message Access Protocol (IMAP)

TCP 143

File Transfer Protocol (FTP) - Data

TCP 20

File Transfer Protocol (FTP) - Control

TCP 21

Secure Shell (SSH)

TCP 22

Telnet

TCP 23

Simple Mail Transfer Protocol (SMTP)

TCP 25

Hypertext Transfer Protocol Secure (HTTPS)

TCP 443

Hypertext Transfer Protocol (HTTP)

TCP 80

A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?

TFTP

Destination Port

The client places a destination port number in the segment to tell the destination server what service is being requested

Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?

Netstat

A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

POP3

Registered Ports

Ports 1024 through 49151 can be used as either source or destination ports. These can be used by organizations to register specific applications such as IM applications

Private Ports

Ports 49152 through 65535 are often used as source ports. These ports can be used by any application.

A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?

DHCP

Well-Known Ports

Destination ports that are associated with common network applications are identified as well-known ports. These ports are in the range of 1 to 1023

A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

FTP

A client packet is received by a server. The packet has a destination port number of 443. What service is the client requesting?

HTTPS

A client packet is received by a server. The packet has a destination port number of 143. What service is the client requesting?

IMAP

A client packet is received by a server. The packet has a destination port number of 25. What service is the client requesting?

SMTP

A client packet is received by a server. The packet has a destination port number of 161. What service is the client requesting?

SNMP

A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?

SSH

Domain Name System (DNS)

UDP & TCP 53

Simple Network Management Protocol (SNMP)

UDP 161

Dynamic Host Configuration Protocol (DHCP) - Server

UDP 67

Dynamic Host Configuration Protocol - Client

UDP 68

Trivial File Transfer Protocol (TFTP)

UDP 69

Which port group includes port numbers for FTP, HTTP, and TFTP applications?

Well-known ports