Firewalls and NAT Flashcards
1
Q
Describe what a router does
A
A router normally just forwards packets without changing them most of the time
2
Q
Describe the role of firewall
A
A firewall can protect networks and devices from external threats by packet filtering
3
Q
Describe how a firewall can be implemented
A
A manager configures the packet filter by specifying which packets can pass in each direction - typically based on IP addresses and application port numbers but the payload of packets may also be examined
4
Q
Describe an NAT
A
An NAT device changes the local IP addresses and ports when they pass on packets
