ccna 1 v3.0 module 2 networking fundamentals. objectives
TRANSCRIPT
CCNA 1 v3.0 Module 2 Networking Fundamentals
Objectives
Data Networks
What is a Network?
At its simplest a network is two or more devices which are connected together using some kind of “transmission medium” A very simple network may be one desktop connected to a laptop
Network History
Network History continued
Networking Devices
Network Topology
Network Protocols
Local-area Networks (LANs)
Wide-area Networks (WANs)
Metropolitan-Area Network (MANs)
Storage-Area Networks (SANS)
Virtual Private Networks (VPNs)
The following are the three main types of VPNs:
Access VPNs – Access VPNs provide remote access to a mobile worker and small office/home office (SOHO) to the headquarters of the Intranet or Extranet over a shared infrastructure. Access VPNs use analog, dialup, ISDN, digital subscriber line (DSL), mobile IP, and cable technologies to securely connect mobile users, telecommuters, and branch offices. Intranet VPNs – Intranet VPNs link regional and remote offices to the headquarters of the internal network over a shared infrastructure using dedicated connections. Intranet VPNs differ from Extranet VPNs in that they allow access only to the employees of the enterprise. Extranet VPNs – Extranet VPNs link business partners to the headquarters of the network over a shared infrastructure using dedicated connections. Extranet VPNs differ from Intranet VPNs in that they allow access to users outside the enterprise.
Benefits of VPNs
Intranet and Extranet VPN
Importance of Bandwidth
Bandwidth Pipe Analogy
Bandwidth Highway Analogy
Bandwidth Measurements
Bandwidth Limitations
Bandwidth Throughput
Digital Transfer Calculation
Digital versus Analog
Using Layers to Analyze Problems
Communication
All of the different types of network face the problem of interconnectionComputers are made by different manufacturers to many different standardsIn order for them to communicate they must adopt the same rules
Open Systems Interconnection
ISO OSI Reference modelThe International Standards Organisation set out a system for Open Systems InterconnectionThis lays out the way that systems should communicate with each otherThe OSI model has 7 layers
Advantages
• Breaks network communication into smaller, simpler parts
• Makes learning easier. • Lets people and companies specialise• It allows different types of network hardware
and software to communicate with each other. • It prevents changes in one layer from affecting
the other layers, so that they can develop more quickly.
OSI Layers
OSI Layers
OSI Layers
OSI Layers
OSI Layers
OSI Layers
•Provides connectivity and path selection between two host
•Provides Logical address
•No error correction, best effort delivery.
OSI Layers
TCP/IP Model
Data Encapsulation
OSI Reference Model
OSI Reference Model
Summary