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Network Security. CHRISTOPHER D. CONEWAY. under the direction of Dr. Foorood Amirmadhi for the CASS/CREST STARS Program Tennessee State University. Agenda. Objective Basic Network Components The Lab Systems Securing the Network Current Work Conclusion. Objective.

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network security

Network Security

CHRISTOPHER D. CONEWAY

under the direction of Dr. Foorood Amirmadhifor theCASS/CREST STARS Program

Tennessee State University

agenda
Agenda
  • Objective
  • Basic Network Components
  • The Lab Systems
  • Securing the Network
  • Current Work
  • Conclusion
objective
Objective
  • Our objective is to better understand Network Security issues, and means to protect it.
  • Our goals are as follows:
    • Network Layer
    • Host Layer
    • Application Layer
a conceptual packet structure
A Conceptual Packet Structure

Control

Source

Destination

Protocol

Data

basic network components
Basic Network Components
  • PCs
  • Router
  • Switch
  • Hub
  • Firewall
the lab systems
The Lab Systems
  • Hardware components
    • Switch, Hub, PC’s
  • Operating Systems
    • Unix: Sun Os 5.5
    • Linux: Red Hat 9.0, SuSE 8.2
    • Windows: 2000, 2000 Server, NT4.0
network diagram
Network Diagram

Internet

Hub

Router

Firewall NG

NAT

Network Address Translator

Firewall

Network 1

Private Class-C:

Address

Network 2

Private Class-C:

Address

Hub

Switch

UNIX BOX

W2K server

Linux

SUSE/W2K

W2K/REDHAT

W2K/REDHAT

W2K/SUSE

W2K-WS1/REDHAT

SUSE

firewall
Firewall
  • Firewall –Hardware or software that examines and controls the traffic between two or more networks (i,e; Internal, and Internet)
  • Firewall policies are a collection rules:

internet

securing the network security tools
Securing the Network:Security Tools
  • Port Scanner (Protocol holes)
  • Security Analyzer (Application Holes)
  • Network Analyzer/Sniffer (Decoding)
current works
Current Works
  • Secure Mail
  • Microsoft Active Directory
  • VPN (Virtual Private Network)
  • Unix systems
secure mail
Secure Mail
  • Virus protection - Server based virus protection using your existing antivirus software.
  • Spam filtering - Checks to see if the computer which sent a message is blacklisted on the major RBL lists. Quarantines or deletes any such messages.
  • Content filtering -. Check for unacceptable language.
  • Attachment filtering - Part of the content filtering. Removes unwanted types of file attachment before they reach the end user.
  • IMAP (Internet Message Access Protocol)support - Store all message folders centrally, allowing side by side access from a mail client or web-mail.
  • Web-based mail client - Provide users with web-based access to their e-mail.
  • Web-based administration - Remotely administer mail using a web browser.
  • Http-s- An extension to the http protocol to support sending data securely over the web.
secure mail diagram
Secure Mail Diagram

Mail Server

Client Computers

active directory
Active Directory
  • Microsoft Active Directory
    • Domain Name Service
    • User and Group account management
    • Organizational units and resources management
vpn virtual private network
VPN (Virtual Private Network)
  • VPN (Virtual Private Network)
    • Checkpoint VPN (CP2000, CPNG)
    • Data integrity and confidentiality are protected through authentication and encryption
    • Data can be securely transmitted between two locations across the Internet or be encrypted between a server and a client

within a Local Area Network

unix systems
Unix Systems
  • Unix systems
    • Internet services (web, mail, proxy, etc..)
    • Redhat & Suse, Sun system platforms
conclusions
Conclusions
  • Security in All Layers Required
  • Be Up-to-date in New Security Issues
  • Consistency in the process of securing systems
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