CISSP Exam Note (Domain 2: Telecommunications and Networking Security) – Firewalls
March 12, 2010 · Posted in Don's eBook Report, InfoSec Docs, Information Security, Information Systems, Information Technology · Comment
Firewalls
Packet Filtering Firewall – First Generation
- Screening router
- Operates at Network and Transport Level
- Examines Source and Destination IP address
- Can deny based on ACLs
- Can specify port
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CISSP Exam Note (Domain 2: Telecommunications and Networking Security) – More Protocols
March 10, 2010 · Posted in Don's eBook Report, Information Security, Information Systems, Information Technology · Comment
Host-to-Host Transport Layer Protocols
TCP – Transmission Control Protocol
- Connection oriented
- Sequenced packets
- Acknowledgement is sent back for received packets
- If no acknowledgement then packet is resent
- Packets are re-sequenced
- Manageable data flow is maintained
Note: TCP and UDP use dynamic port numbers greater than 1023





