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Free Online Flashcard Deck

2 Common TCP Ports and Services Free Online FlashCards

Study 2 Common TCP Ports and Services with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.

12 cards
01
Front

What does a port identify?

Back

A port identifies an application service on a host.

02
Front

What is the typical role of TCP port 21?

Back

TCP port 21 is used for FTP control commands and responses.

03
Front

What service typically uses TCP port 22?

Back

TCP port 22 typically provides SSH: encrypted remote login and command-line administration.

04
Front

What service typically uses TCP port 25?

Back

TCP port 25 is typically SMTP, which transfers email between mail servers.

05
Front

What is TCP port 53 used for?

Back

TCP port 53 carries DNS queries and responses when TCP is used, including reliable transfers such as zone transfers.

06
Front

What web traffic typically uses TCP port 80?

Back

TCP port 80 typically carries HTTP web traffic without TLS by default.

07
Front

Why doesn't a port number prove which service is using it?

Back

Services can use nonstandard ports, and registered ports may carry other traffic; a port number is a clue, not proof.

08
Front

How does FTP file data use connections?

Back

FTP file data travels over a separate connection, whose port depends on the transfer mode.

09
Front

How does SSH access differ from RDP and VNC?

Back

SSH generally provides command-line access, while RDP and VNC provide graphical desktop access.

10
Front

What is TCP port 23 typically used for, and what is its security concern?

Back

TCP port 23 is typically Telnet, an older, unencrypted remote terminal protocol. SSH is the secure alternative for administration.

11
Front

Which other transport commonly uses port 53 for DNS?

Back

DNS also commonly uses UDP port 53.

12
Front

What does HTTPS on TCP port 443 provide?

Back

TCP port 443 typically carries HTTPS: HTTP protected with TLS.