Gate Exam

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?

option
(A) m1:HTTP m2:SMTP m3:POP
(B) m1:SMTP m2:FTP m3:HTTP
(C) m1: SMTP m2: POP m3: HTTP
(D) m1: POP m2: SMTP m3:IMAP

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Gate Other Question
A layer-4 firewall (a device that can look at all protocol headers up to the
transport layer) CANNOT
(A) block entire HTTP traffic during 9:00PM and 5:00AM
(B) block all ICMP traffic
(C) stop incoming traffic from a specific IP address but allow outgoing traffic to
the same IP address
(D) block TCP traffic from a specific user on a multi-user system during 9:00PM
and 5:00AM Let the time taken to switch between user and kernel modes of execution be t1
while the time taken to switch between two processes be t2. Which of the
following is TRUE?
(A) t1 > t2
(B) t1 = t2
(C) t1 < t2
(D) Nothing can be said about the relation between t1 and t2