ECPE / COMP 177 Fall Some slides from Kurose and Ross, Computer Networking, 5 th Edition
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1 ECPE / COMP 177 Fall 2014 Some slides from Kurose and Ross, Computer Networking, 5 th Edition
2 Instructor: Dr. Jeff Shafer jshafer at pacific dot edu Office: Anderson 205 Office hours (posted on my door) Monday: 1:00-3:00pm Thursday: 1:00-3:00pm plus whenever my office door is open 2
3 Lecture When: Tuesday / Thursday, 5pm- 6:30pm Where: Chambers 115 (might change ) Lab When: Monday, 3:30-6:30pm Where: Baun 214 Lab start date: Mon Sept 8 th 3
4 Course websites: network.serv.pacific.edu/ecpe- 177 Slides, syllabus, schedule, assignments, and more Sakai for assignment submission and s only Should auto- signup if enrolled in course 4
5 COMP 53 Data structures Programming in high level language Basic data structures, arrays, pointers, functions, system calls, ECPE 170 Computer Systems and Networks Linux / command- line usage C programming 5
6 What do I, as an application programmer, need to understand about computer networks (including software and hardware both on your computer and elsewhere on the network) in order to write efficient, high- performing programs? 6
7 Labs 10% Applying theoretical concepts to real- world network equipment (Cisco routers and switches) Lab Practical Exam 10% 7
8 In- class Presentations 8% Two presentations Quizzes 12% Six quizzes throughout the semester Posted on class schedule 15 minutes max In lieu of a midterm and final exam 8
9 Projects 60% 6 programming projects using network sockets Individual Implementation platform: Linux Python (3.4+) Past projects: Web server (basic) + web server (parallel) Latency / bandwidth measurement tool Instant messenger / file sharing client 9
10 Will have in- class project work days throughout the semester A laptop to bring to class would be ideal Must be able to run Linux (either in a virtual machine, or dual boot) Do you have a laptop? Do we need an alternate plan? (USB key booting ) 10
11 ??? 11
12 What is the Internet? Network edge - vs- Network core Protocol layers 12
13 What good is a computer when the network is down? I just keep hitting refresh on my web browser until something happens What good is my iphone with no AT&T / Verizon service? What good is a TV without on- demand Netflix streaming? 13
14 PC server wireless laptop cellular handheld router access points wired links Hosts (end systems) Millions of connected computing devices Running network apps Communication links Fiber, copper, radio, satellite Transmission rate = bandwidth Routers Forward packets (chunks of data) between links Mobile network Global ISP Home network Regional ISP Institutional network 14
15 Protocols Control sending and receiving of messages e.g., TCP, IP, HTTP, Skype, Ethernet Mobile network Global ISP Internet standards Who makes (some of) the protocols? IETF: Internet Engineering Task Force RFC: Request for comments Home network Regional ISP Institutional network Internet: network of networks Loosely hierarchical Public Internet versus private intranet 15
16 What is the Internet? Network edge - vs- Network core Protocol layers 16
17 Network edge Applications and hosts Access networks and physical media Wired, wireless communication links Network core Interconnected routers Network of networks 17
18 18
19 End systems (hosts) at edge Run application programs Two models of applications Client/server Peer- to- Peer (P2P) What s the difference? peer- peer Client/server model client/server Client host requests data from always- on server (e.g. web, , ) Peer- to- peer model Minimal (or no) use of dedicated servers (e.g. Skype, BitTorrent) 19
20 Mesh of interconnected routers Fundamental question: how is data transferred through mesh? Circuit switching Dedicated circuit per call Classic telephone network Packet- switching: Data sent thru mesh in discrete chunks 20
21 Each end- end data stream divided into packets User A, B packets share network resources Each packet uses full link bandwidth Resources used as needed Bandwidth division into pieces Dedicated allocation Resource reservation Resource contention Aggregate resource demand can exceed amount available Congestion: packets must wait in queue Store and forward: packets move one hop at a time Receive complete packet before forwarding 21
22 A 100 Mb/s Ethernet statistical multiplexing C B queue of packets waiting for output link 1.5 Mb/s D E Sequence of A & B packets does not have fixed pattern, bandwidth shared on demand statistical multiplexing. Contrast against circuit switching / time- division multiplexing Each host gets same slot (fixed pattern) 22
23 Packet switching allows more users to use network! 1 Mb/s link Each user: 100 kb/s when active Active 10% of time Circuit- switching: 10 users max Packet switching: With 35 users, probability > 10 active at same time is less than.0004 N users 1 Mbps link 23
24 Is packet switching perfect in all situations? (Think about your own experiences) Great for bursty data Resource sharing Simpler, no call setup Less great during excessive congestion: packet delay / loss Protocols needed for reliable data transfer and congestion control Some applications really want circuit- like behavior Streaming video, streaming audio, interactive games, If streaming video data arrives late, it is useless Bandwidth / latency (delay) guarantees needed Still an unsolved problem! 24
25 Roughly hierarchical At center: tier- 1 ISPs with national/international coverage Treat each other as equals Examples: Sprint, Cogent, NTT, L3, Verizon, AT&T Tier- 1 providers interconnect (peer) privately Tier 1 ISP Tier 1 ISP Tier 1 ISP 25
26 POP: point-of-presence to/from backbone peering. to/from customers 26
27 Tier- 2 ISPs: smaller (often regional) ISPs Connect to one or more tier- 1 ISPs, possibly other tier- 2 ISPs Tier- 2 ISP pays tier- 1 ISP for connectivity to rest of Internet (they are a customer of the Tier- 1 provider) Tier-2 ISP Tier 1 ISP Tier 1 ISP Tier-2 ISP Tier 1 ISP Tier- 2 ISPs also peer privately with each other. Tier-2 ISP Tier-2 ISP Tier-2 ISP 27
28 Tier- 3 ISPs and local ISPs last hop ( access ) network (closest to end systems) Local and tier- 3 ISPs are customers of higher tier ISPs connecting them to rest of Internet local ISP local ISP Tier 3 ISP Tier-2 ISP Tier 1 ISP Tier-2 ISP local ISP local ISP Tier 1 ISP local ISP Tier-2 ISP Tier 1 ISP Tier-2 ISP local ISP local ISP Tier-2 ISP local ISP 28
29 A packet passes through many networks local ISP Tier 3 ISP Tier-2 ISP local ISP local ISP Tier-2 ISP local ISP Tier 1 ISP local ISP Tier 1 ISP Tier-2 ISP local ISP Tier 1 ISP Tier-2 ISP local ISP Tier-2 ISP local ISP 29
30 What is the Internet? Network edge - vs- Network core Protocol layers 30
31 HUMAN PROTOCOLS What s the time? I have a question Introductions NETWORK PROTOCOLS Machines rather than humans All communication activity in Internet governed by protocols Protocols (human and computer!) define Format of message Order of messages sent/received on network Actions taken after sending/receiving message 31
32 HUMAN PROTOCOL COMPUTER NETWORK PROTOCOL Hi Hi What s the time? 2:00 time TCP connection request TCP connection response Get <file> 32
33 Networks are complex with many pieces Hosts Routers Links of various media Applications Protocols Hardware, software We divide network functions into layers Easier to understand and discuss role of various devices 33
34 Human Understanding / Discussion Dealing with complex systems Explicit structure show relationship of between components Modularization eases maintenance and system updates Can change how a layer is implemented without modifying other layers (change is transparent) e.g., change in gate procedure doesn t affect rest of system 34
35 Application: supporting network applications FTP, SMTP, HTTP Transport: process- process data transfer TCP, UDP Network: routing of datagrams from source to destination IP, routing protocols Link: data transfer between neighboring network elements Ethernet Physical: bits on the wire application transport network link physical 35
36 source segment datagram frame message H l H t H n H t H n H t M M M M application transport network link physical link physical switch H l H n H n H t H t H t M M M M destination application transport network link physical H l H n H n H t H t M M network link physical H n H t M router 36
37 TCP: Reliable, in- order delivery IP: Un- reliable, order not guaranteed Magic TCP is built on top of IP! Great clown analogy by Joel Spolsky 37
38 Need to move clowns from Broadway to Hollywood for a new job Broadway, NYC 38
39 Car crash / lost Many cars, many clowns Bad things are guaranteed to happen to at least some of them Shaved head / too ugly to work! Different routes 39
40 People in Hollywood get frustrated It s hard to make movies with clowns in this condition! 40
41 New company Hollywood Express UFO crash in Nevada blocks highway? Guarantees that all clowns (1) Arrive (2) In Order (3) In Perfect Condition Mishap? Call and request clown s twin brother be sent immediately Clowns re- routed via Arizona Director never even hears about the UFO crash Clowns arrive a little more slowly 41
42 TCP provides a similar reliable delivery service for IP Abstraction has its limits Ethernet cable chewed through by cat? No useful error message for that problem! The abstraction is leaky it couldn t save the user from learning about the chewed cable 42
43 Today s brief overview Internet overview What s a protocol? Network edge vs Network core Protocol layers Rest of the semester: more depth! 43
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