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Network Fundamentals

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Network Fundamentals Outline LANs LAN Routers / Gateways Wireless Connection Firewalls NAT Network Protocols Protocol Analysis Single Machine Security Risk: Physical ... – PowerPoint PPT presentation

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Learn more at: http://sce2.umkc.edu
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Title: Network Fundamentals


1
Network Fundamentals
2
Outline
  • LANs
  • LAN Routers / Gateways
  • Wireless Connection
  • Firewalls
  • NAT
  • Network Protocols
  • Protocol Analysis

3
Single Machine
  • Security Risk Physical Security
  • Access to Machine (loss of equipment)
  • Hack Machine (loss of information)

4
Local Area Networks
  • Security Risk Physical Security
  • Access to Machine (loss of equipment)
  • Access to Hub / Switch (loss of information)
  • Hack Machine (loss of information)

Hub / Switch
5
Local Area Networks(Routers / Gateways)
Internet
Router / Gateway
6
Local Area Networks(Access Technologies)
  • 56 Kbps Modem
  • Establish a point-to-point connection to ISP
  • Use PPTP (etc.) to establish an internet
    connection
  • Private link
  • DSL
  • Full Time, Broadband connection
  • Uses existing telecom facilities
  • Private link
  • Cable Modem
  • Full Time, Broadband connection
  • Shares existing cable TV facility with others

7
Wireless Connection
WAP Router
Internet
8
Firewalls
  • Provides a mechanism to control / monitor access
    to the LAN

Internet
Firewall
9
Network Address Translation
  • Many networks configured with private IP
    addresses (10.0.0.0, 172.0.0.0, 192.168.0.0)
  • Must convert to public address for Internet
    access.
  • May also have many hosts sharing limited network
    addresses.
  • If only 1 network address, then service is called
    Port Address Translation - PAT
  • NAT provides the translation services

10
Network Address Translation
123.75.46.89
192.168.1.1
192.168.1.25
134.193.17.52
11
Network Protocols
OSI Model
Internet
Application Layer
TCP / UDP Layer
Internet Protocol
Physical Layer
12
LAN Physical Layer Protocols
  • Ethernet
  • 10base5
  • 10base2
  • 10baseT, 100baseT, 1000baseT
  • Wireless Networks
  • 802.11a
  • 802.11b
  • 802.11g
  • Token Ring
  • etc.

13
WAN Physical Layer Protocols
  • Telecommunications
  • DS0, DS1, DS3
  • SONET
  • ISDN
  • etc.
  • Metro Area Protocols
  • Cellular Telephone
  • FDDI
  • WiMAX

14
Network Layer Protocols
  • Internet Protocol (IP)
  • Routes packets across the network
  • Manages packet fragmentation across network
  • Internet Control Message Protocol (ICMP)
  • Provides support for IP and TCP
  • Address Resolution Protocol (ARP)
  • Provides address resolution between network layer
    and data link layer addresses.

15
Transport Layer Protocols
  • Transmission Control Protocol (TCP)
  • Provides reliable end-to-end packet transport
  • Provides packet flow control
  • User Datagram Protocol (UDP)
  • Provides simplified end-to-end packet transport
  • No control overhead
  • No packet fragmentation

16
Application Support Protocols
  • Provide Security
  • SSH / SSL
  • HTTPS
  • Provide Compression / Data Translation
  • zip , tar, compress
  • MIME

17
Application Layer Protocols
  • Support specific network applications
  • FTP
  • WWW (HTTP, etc.)
  • E-MAIL

18
Protocol Analysis
  • Packet Sniffers
  • WireShark (Ethereal)
  • Etherpeek
  • EtherDetect
  • Zx Sniffer
  • AnalogX PacketMon
  • Colasoft Capsa
  • AirMagnet Enterprise (Wireless monitoring)
  • etc.

19
Wireshark Example
20
Summary
  • LANs
  • LAN Routers / Gateways
  • Wireless Connection
  • Firewalls
  • NAT
  • Network Protocols
  • Protocol Analysis
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