Protocols and Ports

Question 1

What are the transport layer protocols in the TCP/IP stack?

Answer 1

There are two transport layer protocols in the TCP/IP stack, which are TCP and UDP.

Question 2

What does the initials TCP denote?

Answer 2

TCP stands for the Transport Control Protocol. TCP provides guaranteed connection-oriented delivery.

Question 3

What does UDP denote?

Answer 3

UDP stand for User Datagram Protocol which provides no guaranteed, contactless delivery.

Question 4

Which default port(s) does the File Transfer Protocol (FTP) use?

Answer 4

FTP uses ports 20 and 21 by default.

Question 5

Which default port(s) does the Simple Mail Transfer Protocol (SMTP) use?

Answer 5

SMTP uses port 25.

Question 6

Which default port(s) does the Internet Mail Access Protocol (IMAP) uses?

Answer 6

IMAP uses port 143

Question 7

Which default port(s) does the Post Office Protocol version 3 (POPv3) use?

Answer 7

POPv3 uses port 110.

Question 8

Which default port(s) does the Hypertext Transfer Protocol (HTTP) use?

Answer 8

HTTP uses TCP port 80.

Question 9

Which default port(s) does the Hypertext Transfer Protocol Secure (HTTPS) use?

Answer 9

HTTPS uses port 443.

Question 10

Which default port(s) does the Trivial File Transfer Protocol (TFTP) use?

Answer 10

TFTP uses UDP port 69.

Question 11

Which default port(s) does the Telnet use?

Answer 11

Telnet uses port 23.

Question 12

Which default port(s) does the Secure Shell (SSH) use?

Answer 12

SSH uses TCP port 22.

Question 13

Which default port(s) does the Remote Desktop Protocol (RDP) use?

Answer 13

RDP uses port 3389.

Question 14

Which default port(s) does the Domain Name System (DNS) use?

Answer 14

DNS uses port 53.

Question 15

Which default port(s) does the NetBIOS use?

Answer 15

NetBIOS use ports 137 and 139.

Question 16

Which default port(s) does the Dynamic Host Configuration Protocol (DHCP) use?

Answer 16

DHCP uses UDP ports 67 and 68

Question 17

Which default port(s) does the Simple Network Management Protocol (SNMP) use?

Answer 17

SNMP uses ports 161 and 162

Question 18

Which default port(s) does the Lightweight Directory Access Protocol (LDAP) use?

Answer 18

LDAP uses port 389

Question 19

Which default port(s) does the Sever Message Block (SMB) use?

Answer 19

SMB uses port 445

Question 20

What does the initials SMTP denote?

Answer 20

Simple Mail Transfer Protocol

Question 21

What does the initials TLS denote with regards to network transmission security?

Answer 21

Transport Layer Security

Question 22

Which protocol is used to transmit data securely between a File Transfer Protocol (FTP) client and an FTP server?

Answer 22

Secure File Transfer Protocol (SFTP), which uses SSH; or File Transfer Protocol Security (FTPS), which uses Secure Socket Layer (SSL).

Question 23

What does the initials HTTP denote?

Answer 23

Hypertext Transfer Protocol

Question 24

What does the initials SNTP denote?

Answer 24

Simple Network Time Protocol

Question 25

Which protocol is used for transferring files from one computer to another?

Answer 25

File Transfer Protocol (FTP)

Question 26

Which lower-layer protocol provides communication between computers or other network devices by using unique global addressing?

Answer 26

Internet Protocol;

Question 27

Which protocol resolves IP address to Media Access Control (MAC) address?

Answer 27

Address Resolution Protocol (ARP)

Question 28

What does the acronym POP3 denote?

Answer 28

Post Office Protocol version 3

Question 29

Which service translates domain names into numeric IP addresses?

Answer 29

Domain Name Systems (DNS)

Question 30

What does the initials RDP denote?

Answer 30

Remote Desktop Protocol

Question 31

What does the initials HTTPS denote?

Answer 31

Hypertext Transfer Protocol Security

Question 32

What does the acronym IMAP denote?

Answer 32

Internet Mail Access Protocol

Question 33

What does the initials ARP denote?

Answer 33

Address Resolution Protocol

Question 34

Which of the TCP/IP protocols was designed as a replacement for Telnet?

Answer 34

Secure Shell (SSH)

The SSH protocol uses encryption to secure the connection between a client and a server. All user authentication, commands, output, and file transfers are encrypted to protect against attacks in the network.

Question 35

Which TCP/IP protocol allows a user to log into a remote computer and manage files as if
they were logged in locally?

Answer 35

Remote Desktop Protocol

Question 36

Which TCP/IP protocol is used to provide shared access to files and printers on the network? 
A. FTP
B. SSH 
C. SMB
D. SMTP

Answer 36

File Transfer Protocol

Question 37

Which TCP/IP Internet layer protocol is responsible for delivering error messages if communication between two computers fails? 
A. ICMP
B. IP
C. TCP
D. UDP

Answer 37

The main Internet layer protocol is Internet Protocol (IP), and it’s the workhorse of TCP/ IP. Another key protocol at this layer is Internet Control Message Protocol (ICMP), which is responsible for delivering error messages. If you’re familiar with the ping utility, you’ll know that it utilizes ICMP to send and receive packets. Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are both communication protocols; TCP guarantees delivery but UDP does not.

Question 38

Which TCP/IP protocol, developed by Microsoft, uses port 3389 to connect to a remote computer?

Answer 38

RDP

Question 39

Which TCP/IP protocol, that’s designed to download email, allows for multiple clients to be simultaneously connected to the same mailbox?

Answer 39

Internet Message Access Protocol (IMAP) is a secure protocol designed to download email. It has several advantages over the older Post Office Protocol 3 (POP3). First, IMAP4 works in connected and disconnected modes. Second, it lets you store the email on the server, as opposed to POP3, which requires you to download it. Third, IMAP4 allows multiple clients to be simultaneously connected to the same inbox.