Messer domain 3 course notes

Question 1

voice and video protocol and port number

Answer 1

SRTP (secure real-time transport protocol/secure RTP), port 5004

uses AES (advanced encryption standard) to encrypt voice/video flow

uses HMAC-SHA1: hash based message authentication code using SHA1

Question 2

time synchronization (insecure and secure) protocol and port number

Answer 2

classic NTP
NTPsec, port 4460

Question 3

protocol for email and port number

Answer 3

S/MIME (secure/multipurpose internet mail extensions)
public key encryption and digital signing of mail content
requires PKI (public key infrastructure)

Question 4

protocol for secure POP and port number

Answer 4

use a STARTTLS extension to encrypt POP3 with SSL (POP3S) and port 995

Question 5

secure IMAP

Answer 5

IMAP with SSL (IMAPS), protocol 993