E-commerce (firewalls)

Network layer firewall works as a

• Frame filter

• Packet filter

• Both (a) and (b)

Network layer firewall has two sub-categories as

• State full firewall and stateless firewall

• Bit oriented firewall and byte oriented firewall

• Frame firewall and packet firewall

Which of the following networking device is called as protocol converter?

1) Repeater

2) Gateway

3) Firewall

4) Switch

• 1

• 3

• 4

• 2

Which mode is a block cipher implementation as a self synchronizing stream cipher?

• Cipher Block Chaining Mode

• Cipher Feedback Mode

• Electronic Codebook Mode

Functional expression of the idea/invention will be protected by ______

• copyright

• patent

• registered trademark