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IT PRO TV Network Plus n10-006 001 Various Network Devices

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 							IT PRO.TV Network Plus 001 Various Network Devices.mp4 
  n10-006 
  
  CompTIA N10-006 1.0
Network Architecture
  Part I
  
  In this episode, Ronnie and Daniel take you through some of the
various network devices that you will most likely encounter as a network tech in the field. They explain in great detail
network appliances like routers, switches, firewalls, and even intrusion detection/prevention systems.
  
 
1.1 Explain the functions and applications of various network devices
  Router (Diagram)
  Used to connect
dissimilar networks
  Dissimilar networks will be on different subnets
  Usually connecting private networks
to/through public network
  Used to separate broadcast domains
  Any network nodes that can receive each
other's broadcast traffic is in the same broadcast domain
  Has multiple interfaces for connecting networks
 
Works on Layer 3 of the OSI model
  Network Layer
  Internet Protocol (IP)
  Data packets
  Learns
networks through the building of a Routing Table
  Routing tables are built automatically through the use of
routing protocols
  RIP
  OSPF
  EIGRP
  Routing tables can also be made up by entering Static
Routes
  Static Routes are manually entered paths to different networks
  3 basic types of router uses
 
Access
  SOHO devices that access the internet and provide internet access
  Fairly inexpensive devices
 
Distribution
  Aggregates data from multiple access routers and funnels them to a main centralized site
 
Higher capabilities than that found in access routers
  Core
  Internet backbone router with highspeed
throughput
  Has multiple interfaces
  Supports multiple protocols
  Switch (Diagram)
  Used to
connect network nodes and separate collision domains
  Works on Layer 2 of the OSI model
  Data-link Layer
  Frames
  LLC and MAC
  Logical Link Control
  Gives functionality of flow control, acknowledgements
and error checking
  Media Access Control
  Used like a traffic cop to control access to the physical media
  Carrier Sense Multiple Access w/ Collision Detection (CSMA/CD)
  MAC Addresses
  48-bit hexadecimal
address
  Hard coded on network interface cards
  Each MAC address is unique
  Learns which MAC address
is connected to which port on the switch
  MAC Address Table
  Switch keeps a table containing all the learned
MAC addresses and their corresponding switch port
  Data is passed in Frames
  Data is sent only to the port
that is connected to the destination host
  Reduces collisions
  Each port is its own Collision Domain
 
Great for all networks, particularly large enterprise-level businesses
  Multilayer Switch (Diagram)
  Does
both switching and routing
  Works on both Layer 2 and Layer 3 of the OSI model
  Firewall (Diagram)
 
Appliance or software designed to permit or deny network traffic governed by a list of rules called an Access Control
List (ACL)
  This is done for the purposes of security
  Can be a dedicated appliance or a feature of another
appliance like a router
  Cisco ASA
  Sonicwall
  Examples of software based Firewalls
  Windows
Firewall
  PFSense
  IPTables
  Inspects incoming and/or outgoing packets
  Packets can be filtered
by...
  Source address
  Destination address
  Port/Protocol
  HIDS (No Diagram)
  Host-based
Intrusion Detection System
  Software application that runs on a computer
  Inspects traffic looking for
intrusion specific footprints
  Viruses, rootkits, malware, etc.
  Also takes a baseline of the system which
allows the HIDS to know if any critical or specified files have been changed
  Alerts the user to unauthorized
changes
  SANS "What is a Host Intrusion Detection System?"
  IDS/IPS (Diagram)
  Intrusion Detection
System (IDS)
  Network appliance that checks for signs of intrusion
  Modified log files
  Modified
system files
  Malware/spyware, virus, worm
  Passive
  Alarms are tripped after the fact
  Other
than alerts, there is no countermeasures taken
  Intrusion Prevention System (IPS)
  Network Appliance that
checks for signs of intrusion in real time
  Actively working to prevent intrusion
  3 types of detection
  Signature detection
  Looks for known avenues or patterns of intrusion
  Statistical anomaly detection
  Creates a statistical analysis of normal network usage and then looks for abberations
  Because of the
statistical nature, new threats are detected before a signature can become available
  Stateful protocol analysis
detection
  AKA Deep Packet Inspection
  Has a knowledge base of how each protocol is supposed to work and
then checks each packet for deviation
  Access Point (wireless/wired) (Diagram)
  Wireless Access Point
 
Appliance that facilitates the connection of wireless
  enabled hosts to a network and/or the Internet
  Most
Wireless APs have routing capability built-in
  Complies with 802.11x standards (a/b/g/n/etc.)
  Connects by
wire to network/internet appliance
  Wired Access Point
  Any appliance that facilitates a network connection
via a wired media
  Hub
  Switch 						

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