Transcript Lecture1 - Lane Thames

ECE 4110 –
Internetwork Programming
Tuna Tugcu
GTREP
[email protected]
Outline
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General information about the course:
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Objective
Textbooks and web site
Labs and C programming language
Rules
Review of computer networks:
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Definitions and architecture
OSI model
Internetwork connections
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Tuna Tugcu
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Objective
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Understand how the Internet works
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IP addressing
TCP/IP
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Flow control, congestion avoidance, etc.
Routing
Linux kernel
Hands on networking exercises
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Sockets programming
TCP/IP Protocol implementation
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Textbooks and Web Site
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We will use three textbooks:
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TCP/IP Illustrated: Volume I (Stevens)
Unix Network Programming (Stevens)
TCP/IP Protocol Suite (Forouzan)
Lots of additional resources mentioned
on the web site.
http://www.gtrep.gatech.edu/academics/ece/summer03/4110.html
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Course material and announcements
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Labs
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We will have 8-10 labs.
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Each day late  -10 points
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Maximum 7 days late; o/w you will get zero from that lab.
We will use Linux OS.
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Digilab I in Chatham Center
Tech 2118 in GaSoU
Lab hours  TBA
Installing Linux on your PC is encouraged.
Topics:
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TCP-UDP traffic generators, network sniffing, IP
forwarding, routing and queuing, etc.
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C Programming Language
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Yes, you need to learn C language
(but not C++).
I will teach some basic concepts in C,
but remember that this is not a C
Programming course.
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You have to study mostly by yourself.
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Rules
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Grading:
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Three tests (20% each)
Final exam (20%)
Labs (20%)
Open books, but not notes
You know the difference between
discussing with friends and cheating.
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Introduction to Computer
Networks
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Network: Collection of devices
(computers, printers, etc.) that are
able to communicate with each other.
internet: Collection of more than one
networks.
Internet: You know …
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Internet
Hierarchy
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Introduction
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Protocol: Set of rules that define what is
communicated when and how.
Protocols are defined by standards:
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(cont’d)
De facto
De jure
Standard bodies, forums, and agencies:
ISO, ITU-T (formerly CCITT), ANSI, IEEE,
EIA, Frame Relay Forum, ATM Forum, FCC.
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OSI Model
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
OSI Model
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(cont’d)
Layered architecture
Peer processes
Interfaces between layers (use of
primitives)
(1) Physical Layer: Transmits bit streams
over a physical medium. [representation of
bits; synchronization; transmission mode
(simplex, half-duplex, full-duplex); etc.]
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OSI Model
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(cont’d)
(2) Data Link Layer: Provides link
connectivity. [framing; physical addressing;
flow, error, and access control]. MAC is a
sublayer of data link layer.
(3) Network Layer: Provides network
connectivity, i.e., delivery of packets from
source to destination. Each packet is
handled independently (no flow concept).
[logical addressing; routing]
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OSI Model
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(cont’d)
(4) Transport Layer: Provides end-toend connectivity, i.e., flow control for
a sequence of packets. [SAP;
segmentation and reassembly;
connection, flow, and error control]
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Connectionless
Connection-oriented
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SAR in Transport Layer
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
OSI Model
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(cont’d)
(5) Session Layer: Provides dialog control
and synchronization.
(6) Presentation Layer: Provides syntax and
semantics interoperability. [encoding
translation; encryption; compression]
(7) Application Layer: Provides network
virtual terminal, file transfer, mail, and
directory services.
Actually, the last three layers are very thin
or non-existent.
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Data exchange in OSI Model
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Node-to-Node Delivery
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
End-to-End Delivery
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Connecting Multiple Networks
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Repeater
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Physical layer.
Connects two segments of a LAN.
Regenerates the signal in one segment and transmits to the other.
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Hub
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Physical layer
Multiport repeater
Implements star topology.
Hub removes the length limitation. How ???
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Bridge
• Two layers.
• Has filtering capability.
• Most bridges today are transparent  they learn the physical (MAC)
addresses of the stations connected directly.
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Router
• Physical, data link, and network layers.
• Provides LAN/LAN, LAN/WAN, WAN/WAN
connectivity. (Repeaters, hubs, and bridges
connect the segments of the same LAN.)
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* From TCP/IP Protocol Suite, B. A. Forouzan, Prentice Hall
Router
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(cont’d)
Three important points about a router:
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For each interface, there is one physical
(MAC) and one logical (IP) address.
If the arriving packet at an interface is
NOT destined to that interface, the router
ignores the packet.
The router changes both the source and
destination physical addresses in the
packet.
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Switch
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Two-layer switch:
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Unique interface for each terminal  no
competing traffic.
A better design for bridge.
Three-layer switch:
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Same as a router in functionality; just
better in performance.
A better design for router.
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