ACTUAL CNIT 34220 EXAM 2 |2025-2026 LATEST UPDATED|
REAL EXAM QUESTIONS AND ANSWERS | 100% RATED
CORRECT | 100% VERFIED | ALREADY GRADED A+
1. What are the two types of computer clocks: Real Time Clock (RTC) is stored in
the BIOS and keeps time even when the computer is turned off. Is notoriously inaccurate.
System clock is maintained by the OS while the computer is running. Relies on the processor
clock which means it can drift due to power saving, virtualization, or CPU throttling.
2. What is SNTP: Simple Network Time Protocol synchronizes the time across a
network once and is less accurate than NTP
3. What is NTP: Network Time Protocol synchronizes the time across a network by
gradually adjusting (slewing). Uses stratum levels.
4. Who do domain members sync time to: PDC FSMO role
5. How many stratum servers are there: 16 servers (0-15)
6. How does the stratum hierarchy work: Stratum 1 references stratum 0 and so
on
7. How many stratum servers does each server reference: Good practice to
reference at least two in case one fails
8. Stratum 0 time sources: Atomic clocks, GPS receivers, etc.
, 9. Stratum 15: unsynchronized server
10. What are NTP timestamps: Special time values used by NTP to represent
precise time
11. How many bits is a NTP timestamp: 64 bits long. 32 bits for seconds since
NTP epoch (Jan 1, 1900) 32 bits for fractional seconds
12. How many bits is a NTP5 timestamp: 128 bits long. NTP will expire in 2036 so
this will fix it
13. Who should VMs be synchronized to: VMs should only be synchronized to
their host
14. What is SMTP: Simple Mail Transfer Protocol is the primary protocol used to
send mail between servers
15. SMTP Process: Only one mail item is sent to any individual host
16. How does SMTP define a host: Fully qualified DNS host names or DNS aliasing
via MX records
17. What port does SMTP use: Port 25 (TCP)
18. SMTP Commands: HELO<sysname>
MAIL FROM:<user@sourcehost>
RCPT TO:<user@destinationhost>
,DATA QUIT RSET
NOOP
19. HELO<sysname>: Connection request from sysname
20. EHLO: I have MIME extensions, do you have them and what's enabled?
21. MAIL FROM:: From this user
22. RCPT TO:: Send to this user
23. DATA: The text data follows terminated by <CR><LF>.<CR><LF>
24. QUIT: Terminate the connection
25. RSET: Abort the connection
26. NOOP: No Operation
27. Server Responses: 250 - OK
500 - Syntax Error
28. SMTP arrival: Mail is delivered, mail is forwarded, or mail is refused (bounced)
29. Bounce reasons: Unknown host
Host was unreachable
Unknown user
User's mailbox is full
, 30. What is MIME: Multipurpose Internet Mail Extensions that makes emails more
robust by allowing attachments, emojis, videos, etc.
31. What is S/MIME: Secure/Multipurpose Internet Mail Extensions encrypts and
verifies email. Relies on a PKI and requires sender's certificate in order to send an
encrypted message
32. S/MIME difficulties: Hard to integrate with webmail because webmail is
designed to be easy to access. Doesn't do well with SPAM because filters can't scan the
messages
33. MX Records: Records used by SMTP servers to determine where to send mail.
The lower the priority number, the more preferred.
34. Common record types: A
CNAME
MX
TXT
SPF
DKIM
DMARC
PTR
35. A record: Maps a hostname to an IP address
REAL EXAM QUESTIONS AND ANSWERS | 100% RATED
CORRECT | 100% VERFIED | ALREADY GRADED A+
1. What are the two types of computer clocks: Real Time Clock (RTC) is stored in
the BIOS and keeps time even when the computer is turned off. Is notoriously inaccurate.
System clock is maintained by the OS while the computer is running. Relies on the processor
clock which means it can drift due to power saving, virtualization, or CPU throttling.
2. What is SNTP: Simple Network Time Protocol synchronizes the time across a
network once and is less accurate than NTP
3. What is NTP: Network Time Protocol synchronizes the time across a network by
gradually adjusting (slewing). Uses stratum levels.
4. Who do domain members sync time to: PDC FSMO role
5. How many stratum servers are there: 16 servers (0-15)
6. How does the stratum hierarchy work: Stratum 1 references stratum 0 and so
on
7. How many stratum servers does each server reference: Good practice to
reference at least two in case one fails
8. Stratum 0 time sources: Atomic clocks, GPS receivers, etc.
, 9. Stratum 15: unsynchronized server
10. What are NTP timestamps: Special time values used by NTP to represent
precise time
11. How many bits is a NTP timestamp: 64 bits long. 32 bits for seconds since
NTP epoch (Jan 1, 1900) 32 bits for fractional seconds
12. How many bits is a NTP5 timestamp: 128 bits long. NTP will expire in 2036 so
this will fix it
13. Who should VMs be synchronized to: VMs should only be synchronized to
their host
14. What is SMTP: Simple Mail Transfer Protocol is the primary protocol used to
send mail between servers
15. SMTP Process: Only one mail item is sent to any individual host
16. How does SMTP define a host: Fully qualified DNS host names or DNS aliasing
via MX records
17. What port does SMTP use: Port 25 (TCP)
18. SMTP Commands: HELO<sysname>
MAIL FROM:<user@sourcehost>
RCPT TO:<user@destinationhost>
,DATA QUIT RSET
NOOP
19. HELO<sysname>: Connection request from sysname
20. EHLO: I have MIME extensions, do you have them and what's enabled?
21. MAIL FROM:: From this user
22. RCPT TO:: Send to this user
23. DATA: The text data follows terminated by <CR><LF>.<CR><LF>
24. QUIT: Terminate the connection
25. RSET: Abort the connection
26. NOOP: No Operation
27. Server Responses: 250 - OK
500 - Syntax Error
28. SMTP arrival: Mail is delivered, mail is forwarded, or mail is refused (bounced)
29. Bounce reasons: Unknown host
Host was unreachable
Unknown user
User's mailbox is full
, 30. What is MIME: Multipurpose Internet Mail Extensions that makes emails more
robust by allowing attachments, emojis, videos, etc.
31. What is S/MIME: Secure/Multipurpose Internet Mail Extensions encrypts and
verifies email. Relies on a PKI and requires sender's certificate in order to send an
encrypted message
32. S/MIME difficulties: Hard to integrate with webmail because webmail is
designed to be easy to access. Doesn't do well with SPAM because filters can't scan the
messages
33. MX Records: Records used by SMTP servers to determine where to send mail.
The lower the priority number, the more preferred.
34. Common record types: A
CNAME
MX
TXT
SPF
DKIM
DMARC
PTR
35. A record: Maps a hostname to an IP address
