01-Comm+Nets+and+Layers

01-Comm+Nets+and+Layers - Communication Networks and...

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1 Communication Networks and Layered Architectures Today • Define computer communications • Define networks Define networks • Discuss layered architectures Computer Communications McNair 2011 2
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2 Computer Communications Dest 4 Local Area Network (LAN) Router ISP Router Router Wide Area Network (WAN) MAN Router LAN Home PC McNair 2011 3 Computer Communications Local Area Networks (LANs) • Scope: Small scope • Ownership: Privately owned. • Communication: Broadcast Router • Topology: Varied, e.g., bus/ring/etc Local Area Network (LAN) McNair 2011 Computer Communications 4
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3 Metropolitan Area Networks (MANs) • Larger in scope than LANs. • Private or Public • LAN Technology • Bus or wireless topology Router Router ISP Router Home PC McNair 2011 Computer Communications 5 Wide Area Networks (WANs) • Large Geographical Area. • Public networks Rt Public networks • Hosts connected by subnets. • Subnets connected by transmission lines. Transmission lines Router ISP Router Router Wide Area Network (WAN) • Transmission lines connected by switching elements (switches or routers). McNair 2011 Computer Communications 6
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4 Circuit Switching versus Packet Switching End Office End Office Switch Router Router Router Router Switch Switch Switch End Office Wide Area Network (WAN) Wide Area Network (WAN) McNair 2011 Computer Communications 7 Computer Architecture and Networks
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01-Comm+Nets+and+Layers - Communication Networks and...

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