ISU CPRE 230 Cyber Security FINAL EXAM || 100% Correct
Answers.
Message Author: What protocol does it use? Are those protocols encrypted? correct answers The
sender of the message
User Agent (UA): What protocol does it use? Are those protocols encrypted? correct answers
Application that allows the user to create, read, send, and manage email messages. Two types:
Local (UA is on the same computer as email server MTA, Webmail implementations, Historic
mail applications such as telnet/ssh to the server, and authentication don with login).
Remote (UA is application on device/laptop, device uses SMTP to send messages, uses IMAP or
POP3 to read messages, and Authentication done before mail is retrieved).
IMAP, POP3 and SMTP are NOT encrypted.
Message Handling System: What protocol does it use? Are those protocols encrypted? correct
answers The entire everything: Message Author, User Agent, Message Transfer Agent, and
Message Recipient.
Message Transfer Agent (MTA): What protocol does it use? Are those protocols encrypted?
correct answers Mail servers that store and forward email. Email will move through multiple
MTAs before arriving at its final destination.
Each of the MTA can store a copy of the email (stores inbound email waiting to be picked up,
outpound email waiting to got out, stored in intermediate servers or 'hops', and don't necessarily
open or read the email unless they provide a spam filter or virus filter function).
Communicate via the SMTP protocol. SMTP is NOT encrypted.
Message Recipient: What protocol does it use? Are those protocols encrypted? correct answers
The receiver of the message.
, What is a plaintext protocol? correct answers A text-based protocol or plain text protocol is a
communications protocol whose content representation is in human-readable format.
Just regulatory text and is not encrypted at all and can be intercepted or sniffed.
Which of these are plaintext: SMTP, IMAP, POP3, HTTP, FTP, Telnet? correct answers SMTP -
Port 25, Plaintext
IMAP - Port 143, Plaintext
POP3 - Port 110, Plaintext
HTTP - Not Plaintext
FTP - Clear Text, so not supposed to be encrypted
Telnet - Sent in Plaintext
What are secure/better alternatives to: SMTP, IMAP, POP3, HTTP, FTP, Telnet? correct answers
SMTP - SMTPS
IMAP - IMAPS
POP3 - POP3S
HTTP - HTTPS
FTP - FTPS
Telnet - SSH
How did we demonstrate plaintext protocols in lab? correct answers Telnet to port 25 and 110,
ran protocol interactively, capturing traffic with wireshark.
What is an X.509 Certificate? correct answers Universally accepted certificate format that is
based on public key cryptography and digital signatures.
Answers.
Message Author: What protocol does it use? Are those protocols encrypted? correct answers The
sender of the message
User Agent (UA): What protocol does it use? Are those protocols encrypted? correct answers
Application that allows the user to create, read, send, and manage email messages. Two types:
Local (UA is on the same computer as email server MTA, Webmail implementations, Historic
mail applications such as telnet/ssh to the server, and authentication don with login).
Remote (UA is application on device/laptop, device uses SMTP to send messages, uses IMAP or
POP3 to read messages, and Authentication done before mail is retrieved).
IMAP, POP3 and SMTP are NOT encrypted.
Message Handling System: What protocol does it use? Are those protocols encrypted? correct
answers The entire everything: Message Author, User Agent, Message Transfer Agent, and
Message Recipient.
Message Transfer Agent (MTA): What protocol does it use? Are those protocols encrypted?
correct answers Mail servers that store and forward email. Email will move through multiple
MTAs before arriving at its final destination.
Each of the MTA can store a copy of the email (stores inbound email waiting to be picked up,
outpound email waiting to got out, stored in intermediate servers or 'hops', and don't necessarily
open or read the email unless they provide a spam filter or virus filter function).
Communicate via the SMTP protocol. SMTP is NOT encrypted.
Message Recipient: What protocol does it use? Are those protocols encrypted? correct answers
The receiver of the message.
, What is a plaintext protocol? correct answers A text-based protocol or plain text protocol is a
communications protocol whose content representation is in human-readable format.
Just regulatory text and is not encrypted at all and can be intercepted or sniffed.
Which of these are plaintext: SMTP, IMAP, POP3, HTTP, FTP, Telnet? correct answers SMTP -
Port 25, Plaintext
IMAP - Port 143, Plaintext
POP3 - Port 110, Plaintext
HTTP - Not Plaintext
FTP - Clear Text, so not supposed to be encrypted
Telnet - Sent in Plaintext
What are secure/better alternatives to: SMTP, IMAP, POP3, HTTP, FTP, Telnet? correct answers
SMTP - SMTPS
IMAP - IMAPS
POP3 - POP3S
HTTP - HTTPS
FTP - FTPS
Telnet - SSH
How did we demonstrate plaintext protocols in lab? correct answers Telnet to port 25 and 110,
ran protocol interactively, capturing traffic with wireshark.
What is an X.509 Certificate? correct answers Universally accepted certificate format that is
based on public key cryptography and digital signatures.
