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Introduction to Computer Networks: Course Syllabus, Lecture notes of Computer Networks

Stanford UniversityComputer Networks

A course outline for an Introduction to Computer Networks course. It covers the fundamental concepts of network protocols and architectures, including the Internet, application layer, naming, network layer, addressing and routing, link layer and wireless, transport layer and queue management, multimedia networking and content distribution, security in networks, wired, wireless, cellular, and cloud computing. The document also provides an overview of communication networks, the Internet, and the ARPANET. The course does not cover homepage design, CSS, PGP, MySQL, Photoshop, Flash, Silverlight, web site administration, web hosting and data center setup and maintenance, DSL or cable modem setup. The document also includes information on late penalties and cheating policies.

Typology: Lecture notes

2021/2022

Uploaded on 05/11/2023

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Lecture 1: Introduction to
Computer Networks
and to Course
Computer Networks
What this Course is NOT About
We do NOT cover:
•Homepage design, CSS, PGP, MySQL
•Photoshop, Flash, Silverlight
•Web site administration
•Web hosting and data center setup and maintenance
•DSL or cable modem setup
•LAN setup and administration
•How to connect to the Internet
•How to become an ISP
•How to run an ISP
What this Course Covers
Network Protocols and Architectures:
•Internet: a netwo rk of networks
•Application layer, naming
•Network layer: addressing and routing
•Link layer and wireless
•Trans port layer and queue management
•Multimedia networking and content distribution
•Security in networks
•Cloud computing
What this Course Covers
Focus on the fundamental concepts, not just the
technology
•there will always be new protocols, how to go about
designing one?
•what are the architectural principles?
Provide high-level overview of computer networks
•wired, wireless, cellular
•how they are interconnected
pf3
pf4
pf5

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Download Introduction to Computer Networks: Course Syllabus and more Lecture notes Computer Networks in PDF only on Docsity!

Lecture 1 : Introduction to

Computer Networks

and to Course

Computer Networks

What this Course is NOT About

We do NOT cover:

  • Homepage design, CSS, PGP, MySQL
  • Photoshop, Flash, Silverlight
  • Web site administration
  • Web hosting and data center setup and maintenance
  • DSL or cable modem setup
  • LAN setup and administration
  • How to connect to the Internet
  • How to become an ISP
  • How to run an ISP

What this Course Covers

Network Protocols and Architectures:

  • Internet: a network of networks
  • Application layer, naming
  • Network layer: addressing and routing
  • Link layer and wireless
  • Transport layer and queue management
  • Multimedia networking and content distribution
  • Security in networks
  • Cloud computing

What this Course Covers

Focus on the fundamental concepts, not just the

technology

  • there will always be new protocols, how to go about

designing one?

  • what are the architectural principles?

Provide high-level overview of computer networks

  • wired, wireless, cellular
  • how they are interconnected

What is a Communication Network?

Communication networks offer one basic service:

move information

  • bird, fire, messenger, truck, telegraph, telephone, Internet …

Another example of networks: transportation network

  • horse, train, truck, airplane ...

What service does a transportation network provide?

What distinguish different types of networks?

What characteristics distinguish the services?

What is the Internet?

regional ISP router workstation server (^) mobile company network local ISP

Internet: “network of networks”

  • loosely hierarchical
  • public Internet versus private intranet

Network components:

  • hosts – communication endpoints: desktops, laptops, tablets, smart phones, glasses, millions of them, running network applications - applications: browser, email clients, facebook app, tweet apps, etc.
  • links – carry bits from one place to another: fiber, copper, satellite, wireless …
  • routers/switches – interconnect links: store and forward packets regional ISP router workstation server (^) mobile company network local ISP

Communication over the Internet

A packet-switched network:

  • data parceled into packets
  • each carries a destination address
  • each is routed independently
  • packets can arrive out of order
  • packets may not arrive at all

Strengths:

  • intelligence at end points
  • decentralized control
  • heterogeneous access technologies

Weaknesses:

  • variable performance, no quality of service
  • no trusted infrastructure

In the Beginning: The ARPANET

Paul Baran

  • RAND Corp, early 1960 s
  • Communications networks that would survive a major enemy attack ARPANET: research vehicle for “Resource Sharing Computer Networks”
  • 2 September 1969 : UCLA first node on the ARPANET
  • December 1969 : 4 nodes connected by phone lines SRI 940 UCLA Sigma 7 UCSB IBM 360 Utah PDP 10 IMPs BBN team that implemented the Interface Message Processor

Course Announcements

Announcement page on course web site (CTools)

Both course web site and Announcement page are

“required readings”

We will post FAQ’s on the Announcements page,

check it first before asking your questions

Grading Policy

• 1 Final Exam: 15 % Wed 4 /27, 4 - 6 pm

• 1 Midterm Exam: 15 % Wed 3/9, 6 - 8 pm, 1013|4 DOW

• 2 Homeworks and n Pop Quizzes: 20%

Hand in hardcopies

• 8 Labs and 4 PAs: 48 % Turn in online

• Class Participation: 2 %

Do not email us any

of your assignments!

Labs and PAs

Each PA has 2 supporting labs

Each lab comprises ≤30% of a PA

If your PA works 100%, you get the full 100 points,

even if you didn’t turn in either of the supporting labs

If you got a lab to work and turned it in on time, but

couldn’t get it to work as part of the PA, you will get

credit for the lab

But if you didn’t turn in a lab on time and couldn’t get

it to work in the PA, you will NOT get credit for the lab

Labs are not accepted late--today’s Lab 0 is not

graded

Grading Policy

Regrade:

  • within 5 working days (except PA 4 and Final Exam, same day)
  • written request
  • whole work will be regraded

Late days:

  • 4 free late days in total for all programming

assignments and homework together

  • including weekends
  • NOT per assignment
  • no need to inform us to use any of your free late days
  • keep track of your own free late day usage

Help with PAs stops 2 days before due date

Late Penalty

Applied to PAs and HW after free late days are used up

Labs and pop quizzes are not accepted late

Penalty schedule:

  • ≤ 24 hours: 4%
  • ≤ 48 hours: 8+4=12%
  • HW will not be accepted more than 2 days late
  • ≤ 72 hours: 12+12=24%
  • ≤ 96 hours: 16+24=40%
  • PAs will not be accepted more than 4 days late

Example:

  • HW is worth 100 points, work late by 24 hours and 1 min
    • if no free late days left: 12 points late penalty
    • if 1 free late day left: 8 points late penalty
  • turning in HW after lecture has started is considered one day late

Collaboration

All work must be done individually

Cheating and plagiarizing are not tolerated

To pass off the implementation of an algorithm

as that of another is considered cheating:

  • e.g., insertion sort is not heap sort
  • must let us know when you turn in your assignment if a

required algorithm/data structure cannot be implemented

Consultation of online and offline sources allowed,

but must not be copied verbatim

Cite your sources, including classmates and

roommates, but not teaching staff or required readings