Networking: Explain common TCP and UDB ports, protocols, and their purpose

Question 1

This provides a centralized database of domain name to IP address resolution on a server that other computers on a network can use for name resolution

Answer 1

The Domain Name System (DNS)

Question 2

Which applications use UDB? (User Datagram Protocol)

Answer 2

NFS, TFTP, SNMP

Question 3

What protocol enables a router to notify you when it exceeds a specified performance threshold?

Answer 3

SNMP (Simple Network Management Protocol)

Question 4

What port is used for secure web browsing, due to the way it establishes connections?

Answer 4

Port 443 aka HTTPS (Hyper Text Transfer Protocol Secure)

Question 5

This protocol will allow you to automatically configure hosts on your network with IP configurations

Answer 5

DHCP (Dynamic Host Configuration Protocol)

Question 6

If an application uses UDP (user datagram protocol) to send a file and data collision occurs, what will most likely happen?

Answer 6

• The protocol will drop the packets

- The application will automatically retransmit the packets

Question 7

What service uses port 3389

Answer 7

RDP (Remote Desktop Protocol)

Question 8

What well known UDP port does DNS use?

Answer 8

53

Question 9

FTP default port(s)

Answer 9

20, 21

Question 10

Telnet default port

Answer 10

23

Question 11

SMTP default port

Answer 11

25

Question 12

DNS default port

Answer 12

53

Question 13

HTTP default port

Answer 13

80

Question 14

POP 3 default port

Answer 14

110

Question 15

IMAP default port

Answer 15

143

Question 16

HTTPS default port

Answer 16

443

Question 17

RDP default port

Answer 17

3389

Question 18

What protocol is used to automate the assignment of IP addresses?

Answer 18

DHCP (Dynamic Host Configuration Protocol)

Question 19

What protocol is used by active directory?

Answer 19

LDAP (Lightweight Directory Access Protocol)

Port 389 by default