3.3 PART 2 Network Security

Question 1

What is a firewall?

Answer 1

Hardware/software that monitors, filters and blocks traffic/ packets being transmitted, sitting between two networks

Acting as a barrier between a trusted and untrusted network, using static filtering or stateful inspection

Question 2

What is the purpose of a firewall?

Answer 2

Attempts to prevent malicious traffic entering the trusted network

Can be configure to prevent certain data leaving the network

Question 3

What is static filtering?

Answer 3

Checking the headers of packets arriving from an untrusted network

Checks against a set of rules (packet filters) defined by the network admin

Question 4

What type of firewalls use stateful inspection?

Answer 4

Sophisticated firewalls, due to needing to carry out more intelligent filtering.

Question 5

What is stateful inspection?

Answer 5

Dynamic filtering; continuously monitoring inbound/outbound traffic, after a connection is established.

Analyses packet types and the payload.

Question 6

What is a prerequisite of stateful inspection?

Answer 6

Firewall must maintain a connection table

Tracks all conversations between networks.