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11 Cards in this Set
- Front
- Back
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What is a firewall? |
An integrated collection of security measures that are designed to prevent unauthorised access to a network computer system. |
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How does a network security system act as a firewall? |
It monitors and controls incoming and outgoing network traffic. Establishes a barrier between a trusted internal network and untrusted external network. |
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Problems with open networks? |
A user may gain access to a workstation and pretend to be another user, alter network address or eavesdrop on communications and do replay attacks. |
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What can a firewall do? |
Security gateway Traffic control device Packet filtering Enforce security policies Secure the network |
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What is a stateless firewall? |
A firewall that makes a decision on a packet by packet basis using IP addresses or other static information. |
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What is a stateful firewall? |
The firewall keeps state information about transactions (connections). Aware of communication paths uses IPSec
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What does NAT- Network Address translation do? |
Translates public IP address(es) to private IP address(es) on a private LAN. |
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Firewall methods? |
Packet filters Stateful Packet Inspection Proxy Firewalls Stateful Multilayer Packet Inspection |
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Firewall types |
Hardware Software |
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Firewall risks? |
Central point for attack (once down whole network down) Packet filtering by a software firewall can degrade your systems peformance. May restrict legitimate users from accessing valuable services Do not provide data Integrity and confidentiality |
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Determine placement of a firewall? |
Risk assessment |
