module02-reviewV2

module02-reviewV2 - Review of Important Networking Concepts...

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1 Review of Important Networking Concepts Introductory material. This module uses the example from the previous module to review important networking concepts: protocol architecture, protocol layers, encapsulation, demultiplexing, network abstractions.
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2 Networking Concepts Protocol Architecture Protocol Layers Encapsulation Network Abstractions
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3 neon.tcpip-lab.edu "Neon" 128.143.71.21 argon.tcpip-lab.edu "Argon " 128.143.137.144 router137.tcpip-lab.edu "Router137" 128.143.137.1 router71.tcpip-lab.edu "Router71" 128.143.71.1 Ethernet Network Ethernet Network Router Sending a packet from Argon to Neon
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4 DNS: The IP address of “neon.tcpip-lab.edu is 128.143.71.21 ARP: What is the MAC neon.tcpip-lab.edu "Neon" 128.143.71.21 argon.tcpip-lab.edu "Argon " 128.143.137.144 router137.tcpip-lab.edu "Router137" 128.143.137.1 router71.tcpip-lab.edu "Router71" 128.143.71.1 Ethernet Network Ethernet Network Router Sending a packet from Argon to Neon DNS: What is the IP address of “neon.tcpip-lab.edu ? 128.143.137.1 is 00:e0:f9:23:a8:20 128.143.71.21 is not on my local network. Therefore, I need to send the packet to my default gateway with address 128.143.137.1 frame 128.143.71.21 is on my local network. Therefore, I can send the packet directly. ARP: The MAC address of 128.143.137.1 is 00:20:af:03:98:28 ARP: What is the MAC address of 128.143.71.21? frame
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5 Communications Architecture The complexity of the communication task is reduced by using multiple protocol layers : Each protocol is implemented independently Each protocol is responsible for a specific subtask Protocols are grouped in a hierarchy A structured set of protocols is called a communications architecture or protocol suite
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6 TCP/IP Protocol Suite The TCP/IP protocol suite is the protocol architecture of the Internet The TCP/IP suite has four layers: Application, Transport, Network, and Data Link Layer End systems (hosts) implement all four layers. Gateways (Routers) only have the bottom two layers. Application Transport Network Operating system User-level programs Data Link Data Link Media Access Control (MAC) Sublayer in Local Area Networks
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7 Functions of the Layers Data Link Layer: Service: Reliable transfer of frames over a link Media Access Control on a LAN Functions: Framing, media access control, error checking Network Layer: Service: Move packets from source host to destination host Functions: Routing, addressing Transport Layer: Service: Delivery of data between hosts Functions: Connection establishment/termination, error
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This note was uploaded on 03/05/2012 for the course CS 458 taught by Professor Staff during the Fall '08 term at UVA.

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module02-reviewV2 - Review of Important Networking Concepts...

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