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

You may also want to consider these CISSP resources from Amazon.com

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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

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