UGC NET CSE | September 2013 | Part 3 | Question: 58

Question

A _____ can forward or block packets based on the information in the network layer and transport layer header

• A. Proxy firewall
• B. Firewall
• C. Packet filter firewall
• D. Message digest firewall

Answer 1

A firewall can be used as a packet filter. It can forward or block packets based on the information in the network layer and transport layer headers: source and destination IP addresses, source and destination port addresses, and type of protocol (TCP or UDP). A packet-filter firewall is a router that uses a filtering table to decide which packets must be discarded (not forwarded).

Hence,Option(C)Packet filter firewall.

Reference :- http://mvn.edu.in/lms/mod/book/view.php?id=86

Comments

Packet filter firewall doesn't hv transport layer...so how can it handle transport layer header...so answer is proxy firewall or layer 5 firewall