12-Networking - CSE 265: System and Network Administration...

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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison CSE 265: CSE 265: System and Network Administration System and Network Administration TCP/IP Networking We will cover just some of the practical issues Highly recommend taking a networking course What is TCP/IP? Layers, addresses, NAT Protocols: ARP, DHCP
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison TCP/IP TCP/IP Most common networking protocol suite Foundation of the Internet 1B+ users online worldwide (Dec 2005) 394M+ hosts online (Jan 2006 number) Network applications typically use one of two transport protocols: TCP – Transmission Control Protocol UDP – User Datagram Protocol All traffic carried by IP – Internet Protocol
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Protocols Protocols IP Packet-oriented (routers don't care what is in packets or what came before) TCP Connection-oriented, two-way, reliable, in-order transport of stream of bytes Congestion control – slow down when congestion is noticed, speed up when resources available Flow control – don't overwhelm receiver UDP Unreliable but quick/easy transport of individual packets
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Network layers Network layers Application layer – end-user applications Transport layer – delivery of data between applications Network layer – basic communication, addressing, and routing Link layer – network hardware and device drivers Physical layer – cable or physical medium
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Encapsulation Encapsulation As data is sent downward through the stack, it is encapsulated with layer-specific headers E.g. App sends 100 bytes UDP adds 8 bytes of header IP adds 20 bytes Ethernet adds 18 bytes
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Layers + Encapsulation Layers + Encapsulation application transport network link physical application transport network link physical source destination M M M M H t H t H n H t H n H l M M M M H t H t H n H t H n H l message segment datagram frame
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Addressing Addressing Different layers use different addressing App. layer (usu.) allows people to use hostnames IP (network) layer requires IP addresses Link layer requires MAC addresses e.g., Ethernet (48 bits) First 3 bytes are manufacturer ID Last 3 bytes are serial number Ports identify process or service on a host List of well-known ports in /etc/services Ports <= 1024 are privileged ports
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Spring 2006 CSE 265: System and Network Administration ©2006 Brian D. Davison Address types Address types IP layer and link layer have multiple address
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This note was uploaded on 08/06/2008 for the course CSE 265 taught by Professor Davison during the Spring '08 term at Lehigh University .

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12-Networking - CSE 265: System and Network Administration...

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