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chap 1 data communications & network management overview…
chap 1 data communications &
network management overview
telephone network
characteristic
dependable
good operation & management of network
good quality of connection
reliable
good planning, design, implementation
telephone network model
operation system
monitor telephone network parameters
S/N ratio, transmission loss, call blockage
real-time management of network
trunk maintenance system measures loss
traffic measurement systems measure call blockage
OS are distributed at central offices
computer data is carried over long distance by telephone
modem : modulate / demodulate (analog format & back)
output telephone : analog - output computer : digital
IBM SNA Architecture
major step in network architecture
based on multitude of dumb terminals accessing a mainframe host at a remote location
DCE with LAN
LAN
LAN - WAN network
no centralized IT controller
hosts doing specialized function
no more monopolistic service provider
C/S architecture formed the core of DCE network
desktop processor
Client/Server Model
TCP/IP Based Network
IP is internet protocol at the network layer level
TCP is connection-oriented transport protocol & ensures end-to-end connection
is a suite of protocols
UDP is connectionless transport protocol & provides datagram service
ICMP part of TCP/IP suite
internet configuration
Architecture, protocols and standards
communication protocols
operaitional procedures - intra / inter modules
communication standard
agreement between manufacurers on protocols - physical characteristic & operational procedures
communication architecture
modeling of systems, comprising, functional component, operations interfaces between them
communication architecture
peer-layer protocol interface
analogy of hearing-impaired student
inter-layer interface : user & service provider
role of intermediate systems
gateway : router with protocol conversion as gateway to an autonomous network
osi model
PDU communication model
what is relevance of PDU model ? gateway
gateway
mail from a station in Novel IPX network to an internet station with SMTP e-mail
SNA, OSI, Internet
simplicity of internet : specifies only layer 3 and 4
integrated application layers over internet
commonality of layers 1 and 2 - IEEE standard
application protocol
IU - FTP / OSIU - FTA & Mnagement
IU - SMTP / OSIU - Message-oriented Text Interchange standard
IU - Telnet / OSIU - virtual terminal
IU - SNMP / OSIU - Common Management Information Protocol
common network problems
intermittent problems
network configuration issues
duplicate IP address
non-problems
loss of connectivity
perfomance problems
challenges of IT Managers
rapid technological advance
scalability
non-real time problems
reliability
trouble prediction
network management
OAM&P
administration
maintenance
Operations
provisioning
NM Functional Flowchart
NM Components
NMS = Agent = Object
status and future trends
status
limited SMIP management
operations systems
SNMP management
polled systems
future trends
object-oriented approach
service and policy management
business management
web-based management
