Common Ports - CompTIA Network+ N10-009 - 1.4

Question 1

SSH

Answer 1

Port 22 TCP or UDP. Securely transfer data.
Terminal Access: Works at CMD.
Remote in via command line.
Used by Secure copy protocol (SCP) (port 22), and SFTP (port 22).
Supports tunneling. Takes a protocol and encapsulates it in a SSH connection.

Question 2

DNS

Answer 2

Domain Name Service
Converts FQDN to IP Address
UDP Port 53.
TCP/53 for large data transfers
Layer 7 TCP/IP protocol.

Question 3

SMTP

Answer 3

Simple Mail Transfer Protocol
TCP Port 25
Server to Server email transfer
Client to Server email transfer

Question 4

SFTP

Answer 4

TCP Port 22. Since SFTP runs over the SSH protocol as a subsystem, SFTP uses port 22 by default.
Secure File Transfer Protocol (SFTP) is a network protocol for securely accessing, transferring and managing large files and sensitive data.
Two ways to authticate with SFTP. Password or public key.
can be used for time stamping. records Date and time of, file type and size.

Question 5

FTP

Answer 5

A service. TCP 20, 21
20 file transfers
21 send commands and responses through CMD.
Not secure.
Used for shared file in corporate network
and data from web servers.

Question 6

TFTP

Answer 6

Trivial File Transfer Protocol
UDP 69
Used to transfer a small amount of information very quickly. Like a config file from server

Question 7

TELNET

Answer 7

23 TCP can remote into devices. Not encrypted. Can be done through command line.
Quick remote access.

Question 8

DHCP

Answer 8

Dynamic Host Configuration Protocol
udp/67, udp/68
Assigns IP address to network devices.
Requires a DHCP server
UDP 7 layer
Uses UDP because service needs to be always open.

Question 9

HTTP

Answer 9

Hypertext Transfer Protocol
TCP Port 80
Unencrypted.
Web Server communication

Question 10

HTTPs

Answer 10

Hypertext Transfer Protocol Secure
TCP Port 443
Encrypted over TLS SSL
Web Server communication with encryption

Question 11

Alternative port for HTTP.

Answer 11

8080

Question 12

SNMP

Answer 12

Simple Network Management Protocol.
UDP Port 161 and 162 USP.
Monitor network devices performance.
SNMP V3 is most current.

Question 13

RDP

Answer 13

3389 TCP. Establish connections remotely.

Question 14

NTP

Answer 14

Network Time Protocol
123 UDP.
Used to sync date and time on all network devices. Always want to have open
Accuracy in atomic or GPC clocks. Used to ensure correct time.

Question 15

SIP

Answer 15

TCP and UDP. 5060, 5061 Session Initiation Protocol. Enables VOip over IP networks.

Question 16

SMB

Answer 16

TCP 455
Server Message Block
Provides communication between devices.

Question 17

POP

Answer 17

110

Question 18

IMAP

Answer 18

Internet Message Access Protocol.
TCP Port 143. Secure communications.
Allows email clients to access and manage emails stored on a remote mail server

Question 19

LDAP

Answer 19

TCP 389.
Directory. centralized location we can use to store all info on users and data.

Question 20

SMTP

Answer 20

25 sents email.

Question 21

Kerberos

Answer 21

88 TCP or UDP.
Authorization protocol for client server applications.

Question 22

TACACS+

Answer 22

49 TCP remote authentication

Question 23

pop3

Answer 23

UDP 110. Post office Protocol. retrieves emails from email servers. 110 receives email. Uses Client Server Architecture.
Only a retrieval protocol.
Not encrypted.

Question 24

Network socket address

Answer 24

IP address and Port number it is sending or receiving on
192.168.4.24 : 80

Question 25

ICMP provides

Answer 25

provides info and error reporting to devices.

Question 26

Windows ssh is called

Answer 26

OpenSSH. A connectivity tool for remote sign-in that uses the SSH protocol

Question 27

TCP three-way handshake

Answer 27

How TCP establisjed a connectiob between a source and destination.

SYN, SYN-ACK, and ACK

Question 28

HTTP uses which layer

Answer 28

7

Question 29

which protocol is http directly encapsulated in?

Answer 29

TCP

Question 30

Which protocol is DHCP directly encapsulated in?

Answer 30

UDP

Question 31

TCP

Answer 31

A service. Uses connection oreinted sessions. A beginning and a end to that data transmission connection. Also known as a three way handshake.

Question 32

HTTPs transfers data in

Answer 32

cipher text (encrypted text)

Question 33

which protocol is used for info and error erporting

Answer 33

ICMP

Question 34

What is the purpose of ports

Answer 34

to represent a logical way for traffic to move into and out of a program or service on a machine.

Question 35

which port do web servers listen for informing traffic and send their own traffic.

Answer 35

Port 80

Question 36

what is a URL

Answer 36

Uniform Resource Locator, is essentially the address of a web page on the internet.

Question 37

HTTPS can use which two versions of encryption protocols

Answer 37

SSL or TLS.
Depending on the type of protocol. It will determine the certificates we use.

Question 38

LDAP SSL

Answer 38

LDAP over SSL, LDAPS
Encrypting the data with (SSL) or newer (TLS).
Port 636

Question 39

DHCP address are assigned

Answer 39

by mac address in the DHCP server