ISRO CS 2015
January 8, 2025UGC NET CS 2007-Dec-Paper-2
January 10, 2025GATE 2011
| Question 15 |
A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT
| block entire HTTP traffic during 9:00PM and 5:00AM | |
| block all ICMP traffic | |
| stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address | |
| block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM |
Question 15 Explanation:
(A) It is possible to block entire HTTP traffic by blocking port no.80.
(B) Possible because it is network layer protocol.
(C) Possible because SP address is present in Network layer.
(D) Not possible, because to block specific user, we need user id which is present in Application layer.
(B) Possible because it is network layer protocol.
(C) Possible because SP address is present in Network layer.
(D) Not possible, because to block specific user, we need user id which is present in Application layer.
Correct Answer: D
Question 15 Explanation:
(A) It is possible to block entire HTTP traffic by blocking port no.80.
(B) Possible because it is network layer protocol.
(C) Possible because SP address is present in Network layer.
(D) Not possible, because to block specific user, we need user id which is present in Application layer.
(B) Possible because it is network layer protocol.
(C) Possible because SP address is present in Network layer.
(D) Not possible, because to block specific user, we need user id which is present in Application layer.