Computer Network (Harbin Institute of Technology)

The "Computer Network" course is divided into three units: "Making the Best Use of Computer Networks", "Exploring the Mysteries of Computer Networks" and "Computer Networks Are Surrounded by Crisis".

"Making the Most of Computer Networks" will help you quickly understand and understand computer networks, understand and master basic concepts such as computer networks and network protocols, network composition and network architecture, and analyze the types of network applications you use every day. The operating principles and application layer protocols help you understand the application programming interface - Socket (Socket) used by most network applications, learn and master the basics of Socket programming technology, and have the ability to develop simple network applications.

"Exploring the Mysteries of Computer Networks" will take you deep inside computer networks, explore the deep mysteries of computer networks, understand and master the deep principles, protocols and network technologies of computer networks, allowing you to not only know what is happening but also why it is happening, truly Become an expert in computer networking. This part mainly teaches: basic principles of reliable data transmission, stop-and-wait protocol and sliding window protocol, typical transport layer protocols (UDP and TCP), virtual circuit network and datagram network, routing and forwarding, IP protocol and IP address, CIDR, Subnetting and route aggregation, ICMP protocol, DHCP protocol, NAT, IPv6, routing algorithm, routing protocol, error coding, MAC protocol, ARP protocol, Ethernet, VLAN, PPP protocol, wireless LAN, etc.

"Computer Networks Are Surrounded by Crisis" will help you understand network security threats, understand and master the basic principles, network protocols and technical measures to ensure network security, and let you realize how to enjoy the many conveniences brought by the network while avoiding them as much as possible. The self is in many crises. This part mainly teaches: basic concepts of network security; network security threats; basic cryptography; information integrity and digital signatures; identity authentication; secure email; SSL; IPsec and VPN; wireless LAN security; firewalls; intrusion detection, etc.

• Chapter 1：What is a computer network? (11 minutes and 47 seconds)

• Chapter 2：What is a network protocol? (8 minutes and 53 seconds)

• Chapter 3：computer network structure (20 minutes and 52 seconds)

• Chapter 4：Internet structure (6 minutes and 52 seconds)

• Chapter 5：circuit switching (10 minutes and 24 seconds)

• Chapter 6：Multiplexing (21 minutes and 35 seconds)

• Chapter 7：Message switching and packet switching (1) (12 minutes and 59 seconds)

• Chapter 8：Message switching and packet switching (2) (18 minutes and 20 seconds)

• Chapter 9：Message switching and packet switching (3) (20 minutes and 20 seconds)

• Chapter 10：speed, bandwidth, delay (20 minutes and 44 seconds)

• Chapter 11：Delay bandwidth product, packet loss rate, throughput (10 minutes and 15 seconds)

• Chapter 12：Computer Network Architecture Overview (17 minutes and 24 seconds)

• Chapter 13：OSI Reference Model (1) (18 minutes and 19 seconds)

• Chapter 14：OSI Reference Model (2) (21 minutes and 43 seconds)

• Chapter 15：OSI reference model (3), TCPIP reference model (21 minutes and 25 seconds)

• Chapter 16：Computer network and Internet development history (23 minutes and 6 seconds)

• Chapter 17：Network application (layer) content overview (3 minutes and 10 seconds)

• Chapter 18：web application architecture (20 minutes and 22 seconds)

• Chapter 19：Network application process communication (18 minutes and 32 seconds)

• Chapter 20：Network application requirements (15 minutes and 32 seconds)

• Chapter 21：Web application overview (13 minutes and 18 seconds)

• Chapter 22：HTTP connection type (18 minutes and 59 seconds)

• Chapter 23：HTTP message format (17 minutes and 11 seconds)

• Chapter 24：Cookie technology (14 minutes and 3 seconds)

• Chapter 25：Web caching technology (20 minutes and 42 seconds)

• Chapter 26：Email application overview (19 minutes and 8 seconds)

• Chapter 27：Email message format and POP protocol (18 minutes and 16 seconds)

• Chapter 28：DNS Overview (29 minutes and 55 seconds)

• Chapter 29：DNS records and messages (12 minutes and 5 seconds)

• Chapter 30：P2P Application_Principles and File Distribution (21 minutes and 17 seconds)

• Chapter 31：P2P Application_Index (20 minutes and 4 seconds)

• Chapter 32：Socket programming(1) (13 minutes and 42 seconds)

• Chapter 33：Socket programming (2) (16 minutes and 33 seconds)

• Chapter 34：Socket programming(3) (21 minutes and 12 seconds)

• Chapter 35：Socket programming (4) (27 minutes and 8 seconds)

• Chapter 36：Socket Programming (5) (22 minutes and 11 seconds)

• Chapter 37：Socket Programming(6) (31 minutes and 27 seconds)

• Chapter 38：Computer Network Beginning (3 minutes and 11 seconds)

• Chapter 39：Overview of computer network transport layer (9 minutes and 52 seconds)

• Chapter 40：Computer network multiplexing and demultiplexing (18 minutes and 26 seconds)

• Chapter 41：Computer Network UDP (17 minutes and 13 seconds)

• Chapter 42：An overview of reliable data transmission in computer networks (22 minutes and 23 seconds)

• Chapter 43：Computer network rdt2.0 (19 minutes and 30 seconds)

• Chapter 44：Computer network rdt2.1 (15 minutes and 16 seconds)

• Chapter 45：Computer network rdt3.0 (20 minutes and 52 seconds)

• Chapter 46：computer network sliding window protocol (8 minutes and 39 seconds)

• Chapter 47：Computer NetworkGBN (17 minutes and 7 seconds)

• Chapter 48：Computer NetworkSR (17 minutes and 56 seconds)

• Chapter 49：Computer Network TCP Overview (11 minutes and 11 seconds)

• Chapter 50：Computer network TCP reliable data transmission (21 minutes and 57 seconds)

• Chapter 51：Computer network TCP flow control (5 minutes and 9 seconds)

• Chapter 52：Computer network TCP connection management (15 minutes and 21 seconds)

• Chapter 53：Computer network congestion control principle 1 (24 minutes and 15 seconds)

• Chapter 54：Computer network congestion control principle 2 (10 minutes and 10 seconds)

• Chapter 55：Computer Network TCP Congestion Control (23 minutes and 2 seconds)

• Chapter 56：Computer Network TCP Performance Analysis (11 minutes and 13 seconds)

• Chapter 57：Computer Network Summary (2 minutes and 56 seconds)

• Chapter 58：network layer services (18 minutes and 16 seconds)

• Chapter 59：virtual circuit network (21 minutes and 52 seconds)

• Chapter 60：datagram network (21 minutes and 41 seconds)

• Chapter 61：IP datagram (21 minutes and 16 seconds)

• Chapter 62：IP datagram fragmentation (22 minutes and 37 seconds)

• Chapter 63：IP addressing (16 minutes and 38 seconds)

• Chapter 64：Classful IP address (22 minutes and 57 seconds)

• Chapter 65：IP subnets and subnetting (21 minutes and 26 seconds)

• Chapter 66：CIDR and route aggregation (19 minutes and 59 seconds)

• Chapter 67：DHCP protocol (18 minutes and 51 seconds)

• Chapter 68：NAT (24 minutes and 37 seconds)

• Chapter 69：ICMP protocol (21 minutes and 47 seconds)

• Chapter 70：Introduction to IPv6 (22 minutes and 0 seconds)

• Chapter 71：Example explanation (21 minutes and 44 seconds)

• Chapter 72：routing algorithm (14 minutes and 26 seconds)

• Chapter 73：Link state routing algorithm (22 minutes and 35 seconds)

• Chapter 74：Distance vector routing algorithm (1) (15 minutes and 11 seconds)

• Chapter 75：Distance vector routing algorithm (2) (29 minutes and 36 seconds)

• Chapter 76：hierarchical routing (21 minutes and 25 seconds)

• Chapter 77：RIP protocol (16 minutes and 18 seconds)

• Chapter 78：OSPF protocol (16 minutes and 44 seconds)

• Chapter 79：BGP protocol (1) (21 minutes and 40 seconds)

• Chapter 80：BGP protocol (2) (18 minutes and 27 seconds)

• Chapter 81：Data link layer services (15 minutes and 8 seconds)

• Chapter 82：error coding (30 minutes and 59 seconds)

• Chapter 83：MAC protocol (17 minutes and 45 seconds)

• Chapter 84：Random Access MAC Protocol (1) (20 minutes and 8 seconds)

• Chapter 85：Random Access MAC Protocol (2) (21 minutes and 43 seconds)

• Chapter 86：Round robin access MAC protocol (13 minutes and 31 seconds)

• Chapter 87：Explanation of homework 2-5 (1 hours and 1 minutes and 52 seconds)

• Chapter 88：ARP protocol (1) (17 minutes and 53 seconds)

• Chapter 89：ARP protocol (2) (11 minutes and 0 seconds)

• Chapter 90：Ethernet (22 minutes and 37 seconds)

• Chapter 91：switch(1) (13 minutes and 5 seconds)

• Chapter 92：switch(2) (15 minutes and 59 seconds)

• Chapter 93：Virtual LAN (VLAN) (12 minutes and 15 seconds)

• Chapter 94：PPP agreement (20 minutes and 11 seconds)

• Chapter 95：802.11 Wireless LAN (1) (16 minutes and 12 seconds)

• Chapter 96：802.11 Wireless LAN (2) (21 minutes and 36 seconds)

• Chapter 97：Data communication basics (37 minutes and 31 seconds)

• Chapter 98：physical media (22 minutes and 6 seconds)

• Chapter 99：Channels and channel capacity (19 minutes and 35 seconds)

• Chapter 100：Baseband transmission basics (29 minutes and 24 seconds)

• Chapter 101：Frequency band transmission basics (40 minutes and 55 seconds)

• Chapter 102：physical layer interface (8 minutes and 35 seconds)

• Chapter 103：Current status of network security (14 minutes and 26 seconds)

• Chapter 104：Basic concepts of network security (13 minutes and 51 seconds)

• Chapter 105：Cybersecurity anthropomorphic model (7 minutes and 7 seconds)

• Chapter 106：Cybersecurity Threats (1) (16 minutes and 41 seconds)

• Chapter 107：Cybersecurity Threats (2) (16 minutes and 15 seconds)

• Chapter 108：Basics of cryptography (1) (16 minutes and 29 seconds)

• Chapter 109：Basics of cryptography (2) (21 minutes and 42 seconds)

• Chapter 110：Basics of cryptography (3) (21 minutes and 53 seconds)

• Chapter 111：Basics of cryptography (4) (7 minutes and 33 seconds)

• Chapter 112：Basics of cryptography (5) (13 minutes and 17 seconds)

• Chapter 113：Basics of cryptography (6) (17 minutes and 37 seconds)

• Chapter 114：Basics of cryptography (7) (17 minutes and 2 seconds)

• Chapter 115：Basics of cryptography (8) (11 minutes and 43 seconds)

• Chapter 116：Authentication (23 minutes and 12 seconds)

• Chapter 117：message integrity (21 minutes and 11 seconds)

• Chapter 118：digital signature (15 minutes and 36 seconds)

• Chapter 119：key distribution center (9 minutes and 39 seconds)

• Chapter 120：Public Key Certification Authority (CA) (11 minutes and 18 seconds)