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Module 7 Final Quiz: The Application Layer MCQs
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1
In what sequence does a recursive DNS resolver query the DNS hierarchy to resolve 'www.example.com'?
A.
Authoritative → TLD → Root
B.
Root Server (.) → TLD Server (.com) → Authoritative Server (example.com)
C.
Browser cache → Web server → Client
D.
Google → ISP → Router
Explanation & Key
Correct Answer:
2
Which transport protocol and port does standard DNS use for user name resolution queries?
A.
TCP port 80
B.
UDP port 53
C.
TCP port 443
D.
UDP port 25
Explanation & Key
Correct Answer:
3
What is the difference between HTTP and HTTPS?
A.
HTTPS is faster than HTTP
B.
HTTPS layers standard HTTP over Transport Layer Security (TLS/SSL), providing end-to-end encryption, data integrity, and server authentication
C.
HTTPS only works with mobile phones
D.
HTTP requires a password to view websites
Explanation & Key
Correct Answer:
4
What HTTP response status code indicates that the requested resource could not be found on the server?
A.
200 OK
B.
301 Moved Permanently
C.
404 Not Found
D.
500 Internal Server Error
Explanation & Key
Correct Answer:
5
Which HTTP request method is Idempotent (making multiple identical requests produces the exact same server state)?
A.
POST
B.
GET (as well as PUT and DELETE)
C.
PATCH
D.
CONNECT
Explanation & Key
Correct Answer:
6
What are the 4 steps of the DHCP DORA process used by a host to obtain an IP configuration?
A.
Data, Order, Route, Assign
B.
Discover → Offer → Request → Acknowledge
C.
Dial → Open → Read → Accept
D.
Deliver → Obtain → Run → Activate
Explanation & Key
Correct Answer:
7
What is the key functional difference between POP3 and IMAP for reading emails?
A.
POP3 sends email; IMAP receives email
B.
POP3 downloads emails and removes them from the server; IMAP synchronizes emails across multiple devices, keeping messages centrally on the server
C.
IMAP cannot read attachments
D.
POP3 requires an encrypted tunnel
Explanation & Key
Correct Answer:
8
Which protocol is responsible for PUSHING email from a mail client to a mail server and between mail servers?
A.
POP3
B.
IMAP
C.
SMTP (Simple Mail Transfer Protocol - Port 25)
D.
FTP
Explanation & Key
Correct Answer:
9
How does FTP use its two communication channels (Port 20 and Port 21)?
A.
Port 20 for passwords; Port 21 for usernames
B.
Port 21 for Control/Commands (login, directory navigation); Port 20 for raw Data transfer (file uploading/downloading)
C.
Port 20 for uploading; Port 21 for downloading
D.
Port 20 for audio; Port 21 for video
Explanation & Key
Correct Answer:
10
What does an HTTP Cookie allow a web server to accomplish?
A.
Speed up the client CPU
B.
Maintain state, user sessions, and preferences across inherently stateless HTTP requests
C.
Permanently encrypt all disk drives
D.
Bypass firewall rules
Explanation & Key
Correct Answer:
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