TCP and UDP Protocols and Ports

Question 1

Protocol?

Used to transfer files across the internet. TCP Port 20-21

Answer 1

File Transfer Protocol (FTP)

TCP Port 20-21

Question 2

Protocol?

A remote administration and file copy program that is flexible enough to support VPNs. Designed to replace unsecure administration and file copy programs. Uses encryption. TCP port 22.

Answer 2

Secure Shell (SSH)

TCP port 22

Question 3

Protocol?

TCP/IP application protocol supporting remote command-line administration of a host (terminal emulation). Is unauthenticated and has therefore been superseded. TCP port 23.

Answer 3

Telnet

TCP port 23

Question 4

Protocol?

The protocol used to send mail between hosts on the internet. TCP port 25.

Answer 4

Simple Mail Transfer Protocol (SMTP)

TCP port 25

Question 5

Protocol?

A network service that provides names to IP address mapping services on the Internet and large intranets. Allows users to access resources using host names and Fully Qualified Domain Names (FQDN). TCP/UDP port 53.

Answer 5

Domain Name System (DNS)

TCP/UDP port 53

Question 6

Protocol?

The protocol used to provide web content to browsers. TCP port 80.

Answer 6

Hypertext Transfer Protocol (HTTP)

TCP port 80

Question 7

Protocol?

Provides a means for a client to access email messages stored in a mailbox on a remote server. Usually deletes messages after the client downloads them. TCP port 110.

Answer 7

Post Office Protocol (POP3)

TCP port 110

Question 8

Protocol?

Provides a means for a client to access email messages stored in a mailbox on a remote server. Messages persist on the server after the client has downloaded them. TCP port 143.

Answer 8

Internet Message Access Protocol (IMAP)

TCP port 143

Question 9

Protocol?

A protocol used to provided encrypted web content to browsers. TCP port 443.

Answer 9

Hypertext Transfer Protocol Secure (HTTPS)

TCP port 443

Question 10

Protocol?

Allows a remote user to connect to a desktop. Technitians can also use to configure or troubleshoot a computer. TCP port 3389.

Answer 10

Remote Desktop (RDP)

TCP port 3389

Question 11

Protocol?

Session management protocol used to provide name registration and resolution services on Microsoft networks. Re-engineered to work over the TCP and UDP protocols on port 137-139.

Answer 11

NetBIOS over TCP/IP (NetBT)

TCP/UDP port 137-139

Question 12

Protocol?

Used for requesting files from Windows servers and delivering them to clients, underpinning file and printer sharing on Windows Networks. Allows machines to share files and printers. TCP port 445.

Answer 12

Server Message Block/Common Internet File System (SMB/CIFS)

TCP port 445

Question 13

Protocol?

Used for sharing files and printers on Apple networks running Mac OS. Uses TCP/UDP on port 427 and TCP on port 548.

Answer 13

Service Location Protocol (SLP) and
Apple Filing Protocol (AFP)

TCP/UDP port 427
TCP port 548

Question 14

Protocol?

Assign IP address information to hosts automatically when they connect to the network. UDP ports 67 and 68.

Answer 14

Dynamic Host Configuration Protocol (DHCP)

UDP ports 67/68

Question 15

Protocol?

Used for accessing and updating information in an X.500-style network resource directory. Unsecured. TCP/UDP port 389.

Answer 15

Lightweight Directory Access Protocol (LDAP)

TCP/UDP port 389

Question 16

Protocol?

Monitors and manages network devices. UDP port 161 and 162.

Answer 16

Simple Network Management Protocol (SNMP)

UDP ports 161/162