13. Application Layer (2) Flashcards
(10 cards)
Multiple Choice
Which port does the FTP control connection use?
A) 20
B) 21
C) 69
D) 80
Select one
FTP control connection
B) 21
Explanation
FTP control connections use port 21. Port 20 is for FTP data transfer.
True/False
TFTP uses TCP as its underlying transport protocol.
True or False
TFTP protocol details
False
Explanation
TFTP uses UDP, not TCP, because it is simpler and has lower overhead.
Open-Ended
Name three transmission modes FTP can use.
Answer briefly
FTP transmission modes
Stream mode, Block mode, Compressed mode
Explanation
FTP supports these three modes for data transmission.
Multiple Choice
Which command is used to initiate a file transfer request in TFTP?
A) INIT
B) FTP
C) RRQ
D) PUSH
Select one
TFTP initiation commands
C) RRQ
Explanation
RRQ (Read Request) initiates file transfer in TFTP.
True/False
SMTP uses encryption by default to secure email communications.
True or False
SMTP security
False
Explanation
SMTP does not use encryption by default; security features like SSL are added optionally.
Open-Ended
What does MIME stand for in email communications?
Answer briefly
MIME details
Multipurpose Internet Mail Extensions
Explanation
MIME allows different types of content to be sent over SMTP.
Multiple Choice
Which encoding is used by MIME to encode binary data?
A) ASCII
B) UTF-8
C) Base64
D) Unicode
Select one
MIME encoding methods
C) Base64
Explanation
Base64 encoding is specifically used by MIME to convert binary data into ASCII.
True/False
POP3 allows users to manage emails directly on the server.
True or False
POP3 protocol capabilities
False
Explanation
POP3 is limited and typically downloads emails from the server, minimizing server-side management.
Open-Ended
How many bytes are typically in a TFTP data packet block?
Answer briefly
TFTP data transfer
512 bytes
Explanation
Default block size in TFTP is 512 bytes, but it can be negotiated differently.
Multiple Choice
SMTP uses which port for sending emails?
A) 25
B) 110
C) 143
D) 443
Select one
SMTP ports
A) 25
Explanation
SMTP typically uses port 25 for sending emails. POP3 (110) and IMAP (143) are for email retrieval.
