Exploration - Chapter 1 (Rev. 1.2)
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Transcript of Exploration - Chapter 1 (Rev. 1.2)
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8/4/2019 Exploration - Chapter 1 (Rev. 1.2)
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2007 Cisco System s, Inc. All rights reserved. Cisco Public
ITE PC v4.0
Chapter 1 1
Living in a NetworkCentric World
Network Fundamentals Chapter 1
CCESC
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Chapter 1 2 2007 Cisco System s, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life
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Chapter 1 3 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Some Popular Communication ToolsInstant messagingReal time communication
between 2 or more
people based on typed text
Weblogs (Blogs)
Web pages created
by an individual
Wiki
web pages that groups of
people can edit and view
together; group creation
Podcasting
Website that contains
audio files available
for downloading
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Networks Support the Way We Learn
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Chapter 1 5 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Networks Support the Way We Work
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Chapter 1 6 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Networks Support the Way We Play
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Chapter 1 7 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, andChallenges Basic characteristics of communication
Rules or agreements are first established
Important information may need to be repeated
Various modes of communication may impact the
effectiveness of getting the message across.
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Chapter 1 8 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Quality of Communications
For data networks, as a message moves through thenetwork, many factors can prevent the message fromreaching the recipient or distort its intended meaning.
These factors can be eitherexternal orinternal.
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Data Networking Role, Components, andChallenges
All networks have four basicelements in common:
Devices
Used to communicate
with one anotherMedium
This is how the devicesare connected together
Messages
Information that travelsover the medium
Rules
Governs how messagesflow across network
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Some Data Network Symbols
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Network Connections
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Applications and Services
Transmission Control Protocol/Internet Protocol(TCP/IP) - industry standard in networking today; theprimary protocol of the Internet today
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Converged NetworksA type of network that can carry voice, video & data
over the same network
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Network Architecture CharacteristicsNetwork Architecture - technologies that support the
infrastructure, the programmed services and theprotocols that move the messages across thatinfrastructure.
Characteristics addressed by network architecturedesign:
Fault tolerance
Scalability
Quality of serviceSecurity
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Network Architecture Characteristics
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Fault-Tolerant Network Architecture
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Fault-Tolerant Network Architecture
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Chapter 1 18 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Internet Architecture
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Internet Architecture
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Internet Architecture
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Internet Architecture
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Internet Architecture
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Internet Architecture
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Chapter 1 24 2007 Cisco System s, Inc. All rights reserved. Cisco Public
Providing QoS Congestion is caused when the demand on the network
resources exceeds the available capacity. Sincenetworks have finite resources, QoS mechanisms areneeded.
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Providing QoSIn order to maintain high QoS for applications thatrequire it, it is necessary to prioritize which types ofdata packets must be delivered at the expense of othertypes of packets that can be delayed or dropped.
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Network Architecture CharacteristicsSelecting the appropriate QoS strategy for a given typeof traffic:
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Providing Network SecuritySome consequences of a network security breach:
Network outage that prevents communications andtransactions occurring, with consequent loss ofbusiness
Misdirection and loss of personal or business funds
Company intellectual property (research ideas,patents or designs) that is stolen and used by acompetitor
Customer contract details that become known tocompetitors or made public, resulting in a loss ofmarket confidence in the business
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Network Architecture CharacteristicsBasic measures to secure data networks
Ensure confidentiality through use of
User authentication
Data encryption
Maintain communication integrity through use of
Digital signatures
Ensure availability through use of
Firewalls
Redundant networkarchitecture
Hardware without a single
point of failure
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Summary