Multiple choice

A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT

  1. block entire HTTP traffic during 9:00 PM and 5:00 AM

  2. block all ICMP traffic

  3. stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address

  4. block TCP traffic from a specific user on a multi-user system during 9:00 PM and 5:00 AM
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since it is a layer 4 firewall, it cannot block application layer protocol like HTTP.

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