Core 1 - 2.1

Question 1

TCP 20/21

Answer 1

FTP - File Transfer Protocol

-Transfers files between an FTP client and FTP server

Question 2

TCP 22

Answer 2

-Secure Shell (SSH)

-Secure terminal emulation that replaces Telnet

Question 3

TCP 23

Answer 3

-Telnet

-Terminal emulation

Question 4

TCP 25

Answer 4

-SMTP (Simple Mail Transfer Protocol)

-Sends an email

Question 5

UDP 53

Answer 5

-DNS (Domain Name System)

-Used by DNS clients to perform DNS queries against DNS servers

Question 6

TCP/UDP 67/68

Answer 6

-DHCP (Dynamic Host Configuration Protocol)

-Used for assigning IP addresses to clients

Question 7

TCP 80

Answer 7

-HTTP (Hypertext Transfer Protocol)

-Web page transmission to web browser

Question 8

TCP 110

Answer 8

-POP3 (Post office protocol)

-Retrieves emails from POP3 mail servers

Question 9

TCP 137/139

Answer 9

-NetBIOS/ NetBIOS over TCP/IP (NetBT)

-Supports older applications that use NetBIOS protocol

Question 10

TCP 143

Answer 10

-IMAP4 (Internet message access protocol version 4)

-Retrieves email

-Advanced features beyond POP3 / Folder synchronization

Question 11

UDP 161/162

Answer 11

-SNMP (Simple Network Management Protocol)

-Queries network devices for status and statistics

Question 12

TCP 389

Answer 12

-LDAP (Lightweight directory Access Protocol)

-A standard method of accessing a network database
-Often used for authenticating user accounts during user logon

Question 13

TCP 443

Answer 13

-HTTPS (Hypertext Transfer Protocol Secure)

-Secure transmission of web pages

Question 14

TCP 445

Answer 14

-SBM (Secure message block)
-CIFS (Common internet file system)

-Windows file and print sharing services

Question 15

TCP 3389

Answer 15

-RDP (Remote desktop protocol)

-Used to remotely access a windows desktop

Question 16

TCP vs UDP

Answer 16

TCP (transmission control protocol) is Connection based
-Reliable (Error recovery), can send messages out of order or retransmit
-flow control on data

UDP (user datagram protocol) is Connectionless
-“unreliable” as there’s no error recovery
-no flow control
-UDP is good for real-time communication

Question 17

DHCP (Dynamic Host Configuration Protocol)

Answer 17

DHCP is a client/server protocol that automatically provides an Internet Protocol (IP) host with it’s IP address and other related configuration information such as the subnet mask and default gateway

Question 18

TFTP (Trivial file transfer protocol)

Answer 18

-Simple protocol for sending/receiving files in a client-server application