Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?
POP3: Post Office Protocol (Responsible for retrieve email)
SMTP: Simple Mail Transfer Protocol (Responsible for send Email)
IMAP: Internet Message Access protocol (Responsible for store and view)
MIME: Multi purpose Internet Mail Extensions (For media)
(i) and (ii) only
(ii) and (iii) only
(ii) and (iv) only
A protocol that requires keeping of the internal state on the server is known as a stateful protocol.
Stateless - HTTP, IP
Stateful - FTP, SMTP, POP3, TCP
TCP is stateful as it maintains connection information across multiple transfers, but TCP is a Transport layer protocol.
FTP and POP3 is stateful Application layer protocol.
The protocol data unit (PDU) for the application layer in the Internet stack is
Consider different activities related to email:
- m1: Send an email from a mail client to a mail server
m2: Download an email from mailbox server to a mail client
m3: Checking email in a web browser
Which is the application level protocol used in each activity?
m1: HTTP m2: SMTP m3: POP
m1: SMTP m2: FTP m3: HTTP
m1: SMTP m2: POP m3: HTTP
m1: POP m2: SMTP m3: IMAP
What is the maximum size of data that the application layer can pass on to the TCP layer below?
216 bytes-size of TCP header
Transport Layer - 65515 byte
Network layer - 65535 byte
Data link layer - 1500 byte
Assume that you have made a request for a web page through your web browser to a web server. Initially the browser cache is empty. Further, the browser is configured to send HTTP requests in non-persistent mode. The web page contains text and five very small images. The minimum number of TCP connections required to display the web page completely in your browser is ______.
Hence, 1 Text + 5 Image = 6 Objects
FTP→ File transfer protocol
SNMP→ Simple network management protocol
SMTP→ Simple mail transfer protocol Simple Mail Transfer Protocol (SMTP): is an Internet standard for email transmission.
→ Mail servers and other mail transfer agents use SMTP to send and receive mail messages on TCP port 25.