ports and protocols

Question 1

Apple Filing Protocol (AFP)

TCP 548

Answer 1

Enables sharing between Macs. Also used by
macOS Time Machine for backing up macOS over the network. Uses TCP
port 548.

Question 2

DHCP (Dynamic Host Configuration Protocol)

UDP 67, 68

Answer 2

Protocol that enables
client hosts to request and receive TCP/IP settings automatically from an
appropriately configured server. Uses UDP ports 67 and 68.

Question 3

DNS (Domain Name Service)

UDP 53

Answer 3

TCP/IP name resolution system that

translates a host name into an IP address. Uses UDP port 53.

Question 4

FTP (File Transfer Protocol)

TCP 20, 21

Answer 4

Rules that enable two computers to talk to
one another during a file transfer. Protocol used when you transfer a file from
one computer to another across the Internet. FTP uses port numbers 20 and
21. TCP

Question 5

HTTP (Hypertext Transfer Protocol)

TCP 80

Answer 5

Extremely fast protocol used for network file transfers in the WWW environment. Uses port 80.

Question 6

HTTPS (HTTP over Secure Sockets Layer)

TCP 443

Answer 6

Secure form of HTTP used
commonly for Internet business transactions or any time when a secure
connection is required. Uses port 443

Question 7

IMAP4 (Internet Message Access Protocol version 4)

TCP 143

Answer 7

An alternative to

POP3 that retrieves e-mail from an e-mail server; IMAP uses TCP port 143.

Question 8

Lightweight Directory Access Protocol (LDAP)

TCP/UDP 389

Answer 8

Protocol used by many

operating systems and applications to access directories. Port 389

Question 9

NetBIOS (Network Basic Input/Output System)

TCP/UDP

TCP 137, 139
UDP 137, 138

Answer 9

Protocol that operates at
the Session layer of the OSI seven-layer model. This protocol creates and
manages connections based on the names of the computers involved. Uses
TCP ports 137 and 139, and UDP ports 137 and 138.

Question 10

POP3 (Post Office Protocol 3)

TCP 110

Answer 10

One of the two protocols that receive e-mail
from SMTP servers. POP3 uses TCP port 110. While historically most e-mail
clients used this protocol, the IMAP4 e-mail protocol is now more common.

Question 11

port (networking)

Answer 11

In networking, the number used to identify the requested
service (such as SMTP or FTP) when connecting to a TCP/IP host. Examples
include application protocol ports such as 80 (HTTP), 443, (HTTPS), 21
(FTP), 23 (Telnet), 25 (SMTP), 110 (POP3), 143 (IMAP), and 3389 (RDP).

Question 12

Remote Desktop Protocol (RDP)

TCP/UDP 3389

Answer 12

Protocol used for Microsoft’s Remote

Desktop tool. Uses port 3389.

Question 13

Service Location Protocol (SLP)

TCP/UDP 427

Answer 13

Protocol for advertising and discovering
available services over a network. Most common with print devices. Uses
TCP/UDP port 427.

Question 14

The Server Message Block (SMB)/Common Internet File Service (CIFS)

TCP/UDP

UDP 137, 138
TCp 139, 445

Answer 14

Windows’ network file and
print sharing protocol. UNIX and Linux systems used a competing protocol,
Network File System (NFS), but that use has declined. Today, every major OS
uses SMB: Windows, macOS, and Linux (using SAMBA). SMB is the
protocol of choice for LAN file servers. Over the years, Microsoft has introduced several versions
(what Microsoft calls dialects) of SMB, and one of the more widespread dialects is Common Internet File System (CIFS). CIFS is currently deprecated
but still widely supported
CIFS uses UDP ports 137 and 138, and TCP ports 139 and 445

Question 15

Secure POP3

TCP 995

Answer 15

TCP port 995

Question 16

Secure IMAP4

TCP 993

Answer 16

TCP port 993.

Question 17

Secure SMTP

TCP 465, 587

Answer 17

TCP port 465 or 587.

Question 18

SMTP (Simple Mail Transport Protocol)

TCP 25

Answer 18

Main protocol used to send

electronic mail on the Internet. Uses port 25

Question 19

SNMP (Simple Network Management Protocol)

TCP/UDP 161, 162

Answer 19

A set of standards for
communication with devices connected to a TCP/IP network. Examples of
these devices include routers, hubs, and switches. Uses ports 161 and 162.

Question 20

SSH (Secure Shell)

TCP 22

Answer 20

Terminal emulation program similar to Telnet, except

that the entire connection is encrypted. Uses port 22

Question 21

Telnet

TCP 23

Answer 21

Terminal emulation program for TCP/IP networks that allows one
machine to control another as if the user were sitting in front of it. Uses port
23.