Aloha, Slotted Aloha Aloha First MAC protocol for packet-based wireless networks Media access control (MAC) Time multiplex, variable, random access NO previous sensing of medium and no announcement of intended transmission Asynchronous access 🔴 Problem: Collision possible
2021-03-18
TCP congestion control summary Focus on congestion control in the context of the Internet and its transport protocol TCP implicit window-based congestion control unless explicitly stated differently Basics Shared (Network) Resources General problem: Multiple users use same resource E.
2021-03-14
Network Functions Middleboxes and Network Functions Middlebox Device on the data path between a source and destination end system Performs functions other than normal, standard functions of an IP route Network function
2021-03-14
SDN summary Basics and Architecture High Level View on Traditional IP Networks Abstract view on an IP router Control plane Exchange of routing messages for calculation of routes … Additional tasks, such as load balancing, access control, … Data plane: Forwarding of packets at layer 3 Every router has control and data plane functions
2021-03-11
Summary of Label Switching Motivation Issues related to IP based routing Lookup is rather complex Longest matching prefix $\rightarrow$ high performance forwarding needed Shortest path routing selects shortest path to destination
2021-03-10
Summary Baiscs Internet: network of networks High-level View on an IP Router Control Plane Routing protocols Exchange of routing messages for calculation of routes Data Plane Lookup Forwarding of packets at layer 3
2021-03-04
Schematic view and generic architecture of router Basic Functionalities Intermediate Systems Forward data from input port(s) to output port(s) Forwarding is a task of the data path May operate on different layers
2021-03-01
Router Acronym Full Name ISP Internet Service Provider IXP Internet Exchange Point FIB Forwarding Information Base CAM Content-Addressable Memory Internet Routing Acronym Full Name AS Autonomous Systems IGP Interior Gateway Protocol EGP Exterior Gateway Protocol ASN Autonomous Systems Number CDN Content Delivery Network OSBF Open Shortest Path First LSA Link State Advertisement ABR Area Border Router BGP Border Gateway Protocol RIB Routing Information Base Label Switching Acronym Full Name MPLS Multiprotocol Label Switching LSR Label-switching router LER Label edge router FEC Forwarding equivalency class RSVP Resource ReserVation Protocol **VPN ** Virtual Private Networks Software Defined Network (SDN) Network Function Virtualization (NFV) Acronym Full Name NAT Network Address Translation NFVI Network Function Virtualization Infrastructure VNF Virtualized Network Functions MANO Management and Orchestration SFC Service Function Chaining Congestion Control Acronym Full Name RTT Round Trip Time EWMA Exponential Weighted Moving Average RTO Retransmission TimeOut AIMD Additively Increase Multiplicatively Decrease AQM Active Queue Management ECN Explicit Congestion Notification RED Random Early Detection Ethernet Acronym Full Name CSMA Carrier Sense Multiple Access CD Collision Detection CA Collision Avoidance IFS Inter Frame Space BPDU Bridge Protocol Data Units STP Spanning Tree Protocol RSTP Rapid Spanning Tree Protocol (RSTP) Data Center Acronym Full Name PFC Priority-based Flow Control PCP Priority Code Point ETS Enhanced Transmission Selection PG Priority Groups QCN Quantized Congestion Notification SPB Shortest Path Bridging TRILL Transparent Interconnection of Lots of Links IS-IS Intermediate-System-to-Intermediate-System DCTCP Data Center TCP ECN Explicit Congestion Notification TCP Evolution Acronym Full Name TLV Type-Length-Value TFO TCP Fast Open Accees Networks Acronym Full Name ISDN Integrated Services Digital Network NT Network Termination DSL Digital Subscriber Line ADSL Asymmetric DSL SDSL Symmetric DSL BRAS Broadband Remote Access Server
2021-03-01
Motivation Human interacts with environment multimodal Modalities Text Audio Vision Other modalities can be used to disambiguate text Jointly using different modalities Image description Generation Generate description/caption of image Verbalize the most salient aspects of the image
2020-09-20
Overview Information Retrieval (IR): finding material (usually documents) of an unstructured nature (usually text) that satisfies an information need from within large collections (usually stored on computers). Use case / applications
2020-09-20