Lecture 1
Introduction - Part1
Internet, Protocols
Video 1 of 3 for this lecture.
Prof. Anja Feldmann, PhD
Goals, Terminology, Protocols, Nuts and bolts, ISPs, RFC, IETF,
This video is part of the first lecture with technical content. We will take a first look on what the Internet is and what role protocols play.
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Lecture 1
Introduction - Part2
Network Edge
Video 2 of 3 for this lecture.
Prof. Anja Feldmann, PhD
Edge, Network,
This video is part of the first lecture with technical content. In this video we will look at the Network edge and try to give you a feeling for the terminology. We will have more in-depth views later in the course.
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Lecture 1
Introduction - Part3
The Network Core
Video 3 of 3 for this lecture.
Prof. Anja Feldmann, PhD
The Core, Network Core, Routing, Forwarding, Queueing, Store-and-forward
This video is part of the first lecture with technical content. We will look at the network core, why the Internet mostly uses packet switching and learn what role a Tier 1 provider plays.
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Lecture 2
Introduction - Part4
Delay, loss, and throughput
Video 1 of 2 for this lecture.
Prof. Anja Feldmann, PhD
delay, loss, throughput, performance
This video is part of the first lecture with technical content. In this part we will take a closer look at Performance, namely: Delay, loss, and throughput.
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Lecture 2
Introduction - Part5
Layers, History, Security
Video 2 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Service models, Security, History
This video is the last part of the first lecture with technical content. We wil talk about protocol layers, service models, Security and the history of the Internet
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Lecture 3
Application Layer - Part1
Client-Server, Peer2Peer
Video 1 of 4 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Application Layer, Client-Server, Peer-to-Peer
This video is the first of two parts on the Application Layer. We will take a look at different Methods of Communication, e.g., Client-Server and Peer-to-Peer, and talk about how processed fit into that scheme.
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Lecture 3
Application Layer - Part2
Sockets, Layers, Protocols
Video 2 of 4 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Application Layer, Sockets, adressing sockets, transport protocols
This video is the second of two parts on the Application Layer. We will talk about sockets, adressing themn, protocols, Internet transport protocols and transport service requirements of applications.
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Lecture 3
Application Layer: HTTP Part 1
HTTP Basics
Video 3 of 4 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Application Layer, protocols, HTTP, protocols by example, HTTP messages, HTTP Request, HTTP Response
This video is part of the lecture series on the Application Layer. It is the first of two videos on HTTP, the HyperTextTransferProtocol, within that series. We will look at the basic modes of operation of HTTP and also show some examples of using a telnet client to send HTTP requests.
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Lecture 3
Application Layer: HTTP Part 2
HTTP Caching and Cookies
Video 4 of 4 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Application Layer, protocols, HTTP, protocols by example
This video is part of the lecture series on the Application Layer. It is the second of two videos on HTTP within that series. It covers some of the 'advanced' features of HTTP, including how this stateless protocol can be used to handle state using cookies and how the most simple form of authentication works.
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Lecture 4
Application Layer: DNS
The Domain Name System
Oliver Gasser
Layers, Application Layer, protocols, DNS, protocols by example, adresses, PTR, NS, MX, nameserver, dig
This video is part of the lecture series on the Application Layer. We will talk about the largest distributed Database of the world, the DNS, often called the phone book of the Internet.
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Lecture 5
Application Layer: Email
A look at SMTP, IMAP, POP3
Video 2 of 2 for this lecture.
Balakrishnan Chandrasekaran, PhD
Layers, Application Layer, protocols, Network Programming, Network Protocols, Email, e-mail, SMTP, IMAP, POP, POP3, mail, MUA, Mail User Agent, MTA, Mail Transfer Agent, MDA, Mail Delivery Agent
E-mail is one of the oldest applications on the internet. But it's not just one protocol, it's several! We will take a dive into SMTP, the Simple Mail Transfer Protocol, and talk about message access protocols like IMAP, the Internet Message Access Protocol, and POP3, the Post Office Protocol.
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Lecture 7
Transport Layer
Intro and UDP
Video 1 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Transport Layer, UDP, User Datagram, Multiplexing, Ports, Sockets, Segments, PDU
In this lecture we will take a look at the Transport Layer and UDP. We will revisit Sockets, Ports and dive right into UDP.
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Lecture 7
Transport Layer: TCP - Part 1
TCP Part 1 of 3
Video 2 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Transport Layer, TCP, Sequence Numbers, Segments, Header, RFC 793, RFC 1122, RFC 1323, RFC 2018, RFC 2581,
In this video we will take a first look at TCP, it's header structure and Sequence Numbers.
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Lecture 8
Transport Layer: TCP - Part 2
TCP Part 2 of 3
Video 1 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Transport Layer, RTT, Retransmission, Timouts, State Machine, TCP, Sequence Numbers, ACK generator, Retransmits
This is the second of three videos on TCP. We will cover some of the basic mechanisms that TCP implements to offer reliable data transfer and take a peek under the hood of some state machine in TCP.
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Lecture 8
Transport Layer: TCP - Part 3
TCP Part 3 of 3
Video 2 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Transport Layer, TCP, window size, state machine, 3-way Handshake, connection management, flow control
This is the third and last video of the series on TCP. We will look into the finite state machine of the protocol, window sizes, connection management and flow control, as well as connection management.
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Lecture 10
Transport Layer: TCP Variants
There are many TCPs
Balakrishnan Chandrasekaran, PhD
Layers, Transport Layer, TCP, Variants, Variants, Protocols, Congestion Control, Congestion Avoidance, Congestion Collapse, BBR, Reno, CUBIC, BBR, NDP, Vegas, BIC, Tahoe
We talked a lot about TCP as one of the major transport protocols in the Internet. Suprisingly there is not just one variant of TCP used on the Internet but there exist dozens of slightly modified versions. We will take a closer look at some of the differences in the protocol definitions and how this changes its behavior.
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Lecture 12
Network Layer: Routing Algorithms
Link State and Distance Vector
Dr. Oliver Gasser
Layers, Network Layer, Routing, Dijstra, Algorithms, Distance Vector, DV, Link-state, LS, Dijkstra, Bellman-Ford, Routing, Costs,
In this video we will discuss two well known routing algorithms: Dijkstra' Algorithm and Bellman-Ford. We will introduce a classification of Routing Algorithms and compare Distance Vector and Link-state Routing.
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Lecture 13
Network Layer: Routing (1)
Routing and RIP
Video 1 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, Historic Protocols, RIP, Algorithms, Inter-AS, Intra-AS, count-to-infinity
In this video we will take a closer look at routing. We will discuss the RIP protocol, which should not be used any more, but can still teach us a lot of valuable lessons.
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Lecture 13
Network Layer: Routing (2)
OSPF - Part 1
Video 2 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, OSPF, Algorithms, IGP, Intra-AS routing, Link state protocol, Dijkstra, LSA, Multicast, Flooding
This is the first of two videos on OSPF, a commonly used routing protocol inside of an AS. We will discuss the protocol phases and look at some examples.
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Lecture 14
Network Layer: Routing (3)
OSPF - Part 2
Video 1 of 3 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, OSPF, Algorithms, IGP, Intra-AS routing, Link state protocol, Dijkstra, LSA, Multicast, Flooding
This is the second of two videos on the inner workings of OSPF, a commonly used routing protocol inside of an AS.
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Lecture 14
BGP Part 1
Routing: BGP
Video 2 of 3 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, BGP, Algorithms, EGP, Inter-AS routing, Policies, BGP Basics, BGP-4, Stub AS, BGP messages
This is the first of four videos on BGP. We will discuss the Basics of BGP, the Border Gateway Protocol, see what routing policies are, why they are important and take a first look at network architectures.
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Lecture 14
BGP Part 2
Overview continued
Video 3 of 3 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, BGP, Algorithms, EGP, Inter-AS routing, path-vector, OSPF, attributes, local pref, Local preference, route processing, route selection, AS Path, AS-Path
This video will continue the introduction to BGP with more details on the inner workings of the protocol. We will take a look at attributes and how routing decisions are being made.
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Lecture 15
BGP Part 3
Routing Policies
Video 1 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, BGP, Algorithms, EGP, Inter-AS routing, MED, Multi-homing, Local Preference, Hot Potato Routing, path-vector
In this video we will take a closer look at policies and why they are so important for routing in the Internet. We will take a look how policies are implemented using BGP.
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Lecture 15
BGP Part 4
Advanced Topics
Video 2 of 2 for this lecture.
Prof. Anja Feldmann, PhD
Layers, Network Layer, Routing, BGP, Algorithms, EGP, Inter-AS routing, Intra--AS routing, iBGP, eBGP, e-bgp, i-bgp, BAD GADGET, Confederations, reflectors, routing instability
In this video we will talk about some of teh advanced features of BGP. We will discuss internal and external BGP (iBGP, eBGP), Route reflectors, confederations and sources for routing instability.
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Lecture 16
Link Layer (1)
Part 1
Video 3 of 3 for this lecture.
Dr. Oliver Gasser
Link Layer, Collisions, ALOHA, TDMA, FDMA, CSMA, CSMA/CD, Token Ring, CRC, Parity
This lecture is the first of two on the link layer. This is the lowest layer we discuss and we will take a look at how access to the communication media is handled and what strategies exist to enable cooperation.
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Lecture 17
Link Layer (2)
Part 2
Dr. Oliver Gasser
Link Layer, Ethernet, Switch, Router, Bridge, 802.3, LAN, Hub, Neighbor discovery, ARP
This is the second part on the Link Layer. We will discuss the differences between Hub, Switch, Bridge, and Router, how they evolved, how ARP and neighbor discovery works and close with a comparison between Hub/Switch/Router.
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Lecture 20
Datacenter - Part 1
The physical cloud
Video 1 of 2 for this lecture.
Balakrishnan Chandrasekaran, PhD
Topology, Networks, Top of Rack, TOR, Fat tree, Pods, Datacenters, cloud
In this video we will talk about Datacenters and try to give an overview about the network topolgy used in these networks.
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Lecture 20
Datacenter - Part 2
Characteristics and Challenges
Video 2 of 2 for this lecture.
Balakrishnan Chandrasekaran, PhD
Topology, Networks, Top of Rack, TOR, Fat tree, Pods, Datacenters, Characteristics, Challenges, Layer 2, Layer 3, TCP, Buffers, Configuration, Management
In this video we will discuss some high level characteristics and challenges inherent in designing and running datacenters.
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Lecture 21
Software-defined Networking (SDN)
Part I
Video 1 of 2 for this lecture.
Savvas Zannettou, PhD
SDN, control plane, data plane, management plane,
This video introduces the software defined networking paradigm
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Lecture 21
Software-defined Networking (SDN)
Part II
Video 2 of 2 for this lecture.
Savvas Zannettou, PhD
control and data plane separation, controller, openflow, fault tolerance, challenges,
This video introduces the software defined networking paradigm
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Lecture 23
State - Part 1
Hard or Softstate?
Video 2 of 4 for this lecture.
Prof. Anja Feldmann, PhD
HTTP, FTP, State, Hard-state, Soft-state, Signaling, inband
In this video we will focus on State and the difference between Hard- and Soft-state. We will take a look at state in HTTP and FTP and discuss the different aspects of hard- vs. softstate.
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Lecture 23
State - Part 2
Model and Evaluation
Video 3 of 4 for this lecture.
Prof. Anja Feldmann, PhD
State, Soft-state, lifetime, timer, evaluation, modeling
This video takes a short look at design principles, models and (performance) evaluation of soft-state.
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Lecture 23
RSVP
Resource Reservation
Video 4 of 4 for this lecture.
Prof. Anja Feldmann, PhD
RSVP, state, protocol design, signaling, reservation, resources
This video is on RSVP, the Resource Reservation Protocol - not the closing "répondez s'il vous plaît" in invitations. We will not discuss RSVP in detail, as it is rather complex, but focus on some parts that are well suited to explain important aspects of signaling.
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Lecture 26
Quality of Service (QoS)
Priorities, priorities...
Video 1 of 3 for this lecture.
Balakrishnan Chandrasekaran, PhD
QoS, Quality of service, ToS, service classes, differentiated services, VoIP
This video covers some aspects of traffic priorization. What are some challenges when different applications share the available bandwidth. For example, how can the network help ensure that applications that require low rtt, typically voice and real-time video applications, remain usable while starting a download in the background.
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Lecture 26
QUIC
Quick UDP Internet Connections
Video 3 of 3 for this lecture.
Balakrishnan Chandrasekaran, PhD
Head of Line blocking, HTTP, UDP, QUIC, protocol design
In this video we again focus on a protocol, that is implemented on top of UDP. We will explore some of the reasons why HTTP via TCP was considered unsuitable and look into the protocol design of QUIC - Qick UDP Internet Connections.
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