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