Objectives
Living in a Network
Centric World
Network Fundamentals – Chapter 1
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ƒ
Describe how networks impact our daily lives.
ƒ
Describe the role of data networking in the human
network.
ƒ
Identify
y the key
y components
p
of any
y data network.
ƒ
Identify the opportunities and challenges posed by
converged networks.
ƒ
Describe the characteristics of network architectures:
fault tolerance, scalability, quality of service and
security.
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Network Architecture Characteristics
Data Networking Components
ƒ Devices
–These are used to
communicate with one
another
ƒ Fault tolerance
ƒ Scalability
ƒ Medium
ƒ Quality of service
–This
This is ho
how the de
devices
ices
are connected together
ƒ Security
ƒ Messages
–Information that travels
over the medium
ƒ Rules (protocols)
–Governs how messages
flow across network
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Network Architecture Characteristics
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Network Architecture Characteristics
ƒ Circuit-switched Connection-oriented Networks
ƒ Packet switching helps improve the resiliency and fault
tolerance of the Internet architecture
A temporary circuit must be setup between devices before
data can be transmitted (delay for dial-up)
Users have dedicated access to the circuit that connects
them
Inefficient use of bandwidth
ƒ Packet-switched Connectionless Networks
Messages are split into discrete packets
Each packet is routed to the destination device
The message is re-assembled
Links between devices are shared – more efficient use of
bandwidth
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Network Architecture Characteristics
Quality of Service
ƒ Characteristics of the Internet that help it scale to meet
user demand
ƒ QoS mechanisms work to ensure quality of service for
applications that require it.
–Hierarchical
–Common standards
–Common protocols
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Quality of Service
Quality of Service
ƒ Need to select the appropriate QoS strategy for a given
type of traffic
ƒ Queuing strategy mechanisms necessary to ensure
QoS
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Network Architecture Characteristics
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Network Security
ƒ Basic measures to secure data networks
ƒ Networks must be secure
–Ensure confidentiality through use of
• User authentication
• Data encryption
–Maintain communication integrity through use of
• Digital signatures
–Ensure availability through use of
• Firewalls
• Redundant network
architecture
• Hardware without a single
point of failure
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Chapter 1 Labs
ƒ Activity 1.1.4:
Using Google Earth
ƒ Activity 1.4.5.3:
Security
ƒ Lab
L b1
1.6.1:
61
Using collaboration tools: IRC and IM
ƒ Lab 1.6.2:
Using collaboration tools: Wikis and Web Logs
ƒ PT Lab 1.7.1:
Contains the details of the standard topology used
throughout Exploration 1.
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