Norman notes Until Structured Cabling Flashcards
(38 cards)
Computer Networks
the interconnection of a collection of autonomous computers
Advantages of Computer Networks
Resource Enhancement (Sharing)
High speed communications
Cost Balancing (scalable and agile)
Reliable
Availability
Mobility (accessed from anywhere)
Simple network model
Logical connection between two APS comes about by a physical connection of circuits
Protocols
A set of rules that govern the communication between two entities
Categories of protocols
Proprietary
Public
De Jure Standards
De Facto standards
Proprietary Protocols
Device can only communicate with devices of the same protocol
Public protocol
Standardized publicly used protocol such as tcpip
Defacto standards protocols
Standard protocol that comes around due to widespread acceptance
De jure standards
Formal standards by organizations such as IEEE. Ensure QoS
Types of Protocol
Master and slave
Peer to peer
Connection less data gram
Connection oriented virtual circuit
Send and pray
Remote procedural call
Synchronous
Asynchronous
Layered
Monolithic
Heavy
Light
Master and Slave
One device known as master controls all other slave devices
Connectionless data gram
Data is transmitted without establishing dedicated connection. Each packet treated individually, no guarantee they will arrive in order
Connection oriented (VC)
Dedicated connection, packets arrive in order
Send and pray
Transmit data without any error checking
Remote procedural call (rpc)
Program on one pc allowed to execute on another pc over a network
Synchronous
Sender and receiver operate in lockstep
Asynchronous
Data transmitted independently
Layered
System broken down into separate layers that interact through interface
Monolithic
Single tightly coupled unit with no separation between modules
Heavy
Needs a lot of overhead to function
Light
Simple and efficient, less overhead required
What is the function of a protocol
It’s the way two ends of the service exchange data. Uses communication systems to define what each user sees.
Uses classes of service
Classes of service
Connection oriented
Connection less service
Acknowledged connectionless
Unconfirmed connection oriented (send and pray)
Responsibilities of protocols
Data formatting (prepare data)
Address resolution (map address to physical location)
Synchronization (between sender and receiver)
Error detection and correction
Flow control
Routing (select best path)
Segmentation and reconstruction
Congestion control
Access control
Link management
Quality of service
