Network security
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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


Osi model

OSI Model


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


Policies firewall

Policies-Firewall


Securing the network security tools

Securing the Network:Security Tools

  • Port Scanner (Protocol holes)

  • Security Analyzer (Application Holes)

  • Network Analyzer/Sniffer (Decoding)


Security analyzer report sample

Security Analyzer Report Sample


Port analysis section

Port Analysis Section


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


Active directory diagram

Active Directory Diagram


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


Vpn diagram

VPN Diagram


Vpn client connected to private coe lab network

VPN Client Connected to Private COE-Lab 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


Questions

Questions


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