2.1 Common Network Ports Flashcards
(51 cards)
For well-known port numbers, what 2 things need to match?
Client and server
What are the port numbers for FTP?
tcp/20 (active mode data)
tcp/21 (control)
What does FTP do?
Transfers files between systems with full-featured functionality such as List, add, delete, etc
How does FTP authenticate users?
With a username and password (some systems use a generic/anonymous login)
What is the port number for SSH?
tcp/22
SSH looks and acts just like what?
Telnet
What is Telnet’s port number?
tcp/23
What does Telnet allow us to do?
Allows us to log in to a device remotely using in-the-clear communication (not secure)
What is the port number for SMTP?
tcp/25
What is SMTP’s function?
Server-to-server email transfer, also used by mobile devices and email clients to send mail
What protocols are used to receive mail?
IMAP, POP3
What is DNS’s port number?
udp/53
What does DNS do?
Converts names to IP addresses
Usually, multiple DNS servers are in production. T or F?
True, they are very critical resources
What are the ports for DHCP?
udp/67
udp/68
What’s the purpose of DHCP?
Automatic configuration of IP address, subnet mask, etc
What does DHCP require?
A DHCP server
Where can you find DHCP servers? (3)
Its own server, as an appliance, integrated into a SOHO router, etc
How are dynamic IP addresses assigned by DHCP?
taken from a pool of IP addresses in real-time
How long do assigned IP addresses last?
Each system is given a lease and must renew the IP address at certain intervals
What is DHCP reservation?
IP addresses are assigned by MAC address in the DHCP server to help manage addresses from one location
HTTP and HTTPS is for communication taking place where?
in the browser
In the clear HTTP and encrypted HTTPS is supported by which web servers and clients?
Nearly all
What is the port number for POP3?
tcp/110
