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Module 1 - 5a Networked Systems

Module 1 – 5a Networked Systems
Networked Systems: group of interconnected (via cable and/or wireless) computers and peripherals that
are capable of sharing software and hardware resources between many users
Enables multiple users to share devices/data which saves time/money
Basic Network Components
Computer or device on network that request resources or services from another
computers/devices within network
Any computer or device on network that enables resources sharing
Network Devices
Devices used to connect computers or other electronic devices together for sharing of files and
Any device connected to network other than networking cabling which has a unique address and
capable of sending or receiving data
o Ex. Printer
Powerful computers that provide specific resources or services to other computers (clients)
Transmission Media
Various channels through which data is transmitted and received
Client Server Architecture
Network architecture where each computer is configured either as a client or a sever
Easier organization/management of resources to include data updates and editing along with
creating backups
Monitoring access rights as well as defining rules for security which is meant to prevent any
illegal/unauthorized access
More expensive in setup and maintenance due to specialized sever equipment and software
Module 1 – 5a Networked Systems
When clients are added it increases the workload placed on the server; reduces network speed
Should the server fail, the network could collapse. Clients need a server to function. A crash can
loss all server data
Server Types
Application Server
Designed to run specific applications
DHCP Server
Assigns each computer an IP address from a list of available addresses. Logs and tracks IP and
network connections
Domain Name System (DMS) Sever
Provides a translation of domain names into IP addresses
Mail Server
Emails; transfers and stores mail over corporate networks thru LANS
Proxy Server
Mediator between client and server
Filtering device
Virtual Servers
Data center shared by multiple web site owners
Web Server
Provides content to a web browser by loading a file from a disk
Types and Structure
Network comprised of computers connected for purpose of sharing resources
Ability to share information over dissimilar networks known as internetworking
Local Area Network (LAN)
Grouping computers and other devices a in single physical location
Metropolitan Area Network (MAN)
Network physically covering an area larger than a Lan yet smaller than a WAN
Wide Area Network
Module 1 – 5a Networked Systems
Network covering a larger geographical area networks (LAN, MAN,WAN) together
Global Area Network (GAN)
Personal Area Network (PAN)
Wireless Local Area Network (WLAN):
Lan without wires
Network Topologies
the physical structure of a network,
Stat topology
Tress Hierarchical Topology
central node connecting multiple nodes to one another
Mesh Topology
Hybrid Topology
Transmission Media
channel between
Transmission Media Category
Twisted-Pair Cable
Fiber-Optic Cable
Single Mode Fiber
Multi-mode Finer
Module 1 – 5a Networked Systems
Factors selecting transmission media
Frequency (Bandwidth)
Network Devices
Network Interface Car (NIC)
card that allows computer to become a network node
determines the proper path for traffic to take by saving routing info in an internal table
limits network connections
connects 2 or more networks together
may connect dissimilar physical topologies as well as wired or wireless
intelligent network node connecting networking of different types
intelligent devices maintaining routing table determining best path to destination node
devices used to give data the extra extension to reach its destination
combinations of networking hardware and software connecting dissimilar networks
Wireless Remote Access
end user has wireless NIC connecting to an access point (corporate LAN or Internet)