udemy computer networks

Study Notes: Chapter 1-Overview of computer networks 1.0Definition of Computer Network:A set of self-governing computers is called computer networks. 1.1The role of computer networks

replace people's feelings. Online transactions of virtual products can be directly realized, such as the purchase, transmission, transmission, and receipt of text and audio/video. However, even things larger than sesame seeds must be delivered by people. This is the limit of network development. It can surpass people in terms of virtual and sensory aspects, but it will never replace people in terms of physical feelings. 1. Data Communication In modern society, the amount of information is surgi

. Hybrid Routing protocolHybrid routing is a combination of the prior routing protocol and the reactive routing protocol, which uses a priori routing protocol in local scope, maintains accurate routing information, and can reduce the range of routing control message propagation. When the target node is far away, it uses the reactive routing protocol to find the discovery route. The ZRP protocol is the representative of a hybrid routing protocol.The ZRP protocol is a tiled routing protocol design

1, Network layer Responsibilities:Responsible for forwarding packets between different networks (based on IP address), not responsible for retransmission, not responsible for the order.Note: During the two host communication process, each packet selects a routing path individually.2, the router can see the IP address, so work in 3 layers. The following application tiers (hubs, switches, routers) are not poisoned, but are affected by viruses and so on.

According to Wikipedia, a computer Network are a collection of computers and devices interconnected by Communicati On channels this facilitate communications among users and allows users to share resources. Computer networks can be classified based on different standards.An important concept relevant to computer networ

In computer networks and IDCs, the unit of bandwidth rate is expressed in BPS (or B/S). The conversion relationship is 1 byte = 8bit.1B = 8B ---------- 1B/S = 8B/s (or 1bps = 8bps)1kb = 1024b ---------- 1kb/S = 1024b/s1 MB = 1024kb ---------- 1 Mb/s = 1024kb/sIn actual online applications, when downloading software, you often see the words "Bandwidth speed", such as KB (kb/s) and 103kb/s, because the ISP's

DHCP server is correct and whether the network traffic is routed correctly. At this time, the network connection has been tested, so the computer can re-connect to the network. For persistent network connection problems, it is best to use an online connection tool between the computer and the Network for additional diagnosis.Step 2: Check speed/Duplex Mode settings Some link performance faults, such as Dup

Overview of computer networks and Internet connections I. Computer Networks and Internet connections 1. Computer Network (hereinafter referred to as a network): it is composed of several nodes (also known as nodes) and links connecting these nodes. Nodes can be routers, hu

The computer communication network involves two fields of communication network computers. The communication network provides necessary means for data transmission and exchange between computers. Computer technology permeate the communication network and improves the performance of the latter. As a mature technology, IP plays a positive role in the rapid development of the Internet based on the features of

find chrome. ② Right-click chrome in the task manager and go to the details (win7 should be called "Go to process") to view the process name of the application. 　　　　　　 In this example, chrome.exe is the process name of the application. Add it to the configuration file and save it. 　　　　　　　　 2. Configure to use other tools to share the network (Energy version only) Declare again:By default, this software uses the Windows built-in WiFi shared kernel network. The damage caused to you by using o

1.OSI (open System Interconnection) Open Systems Interconnect Reference Model. It is divided into application layer (SMTP), presentation layer, Transport layer (TCP), Network layer (IP), data connection layer, physical layer.2.TCP/IP Network communication Protocol, Transmission Control Protocol TCP is a reliable connection-oriented Transport layer communication protocol based on Byte stream, the Internet is made up of tens of millions of computers, confirming that every

sent by this system has a strong anti-interference capability, and its spectrum is similar to white noise, which is not easy to be detected by enemies. Each bit time is divided into m short intervals, called Chip) Width Access Technology XDSL technology Category: ADSL(Asypolicric Digital Subscriber Line) Asymmetric Digital user line HDSL(High speed DSL) high speed digital user line SDSL(Single-line DSL) Peer digital user line VDSL(Very high speed DSL) extremely high-speed dig

. GOOGLE. COM. GitHub.com mail is handled by 1 Aspmx.com.$ host Facebook.github.comfacebook.github.com is an alias for github.fastly.net . Github.map.fastly .net has address 103.245 222.133 hostCommands can also be used for reverse queries, that is, querying a domain name from an IP address, equivalent to dig -x . 192.30.252.153153.252.30.192.in-addr.arpa domain name pointer pages.github.com. (2) nslookup commandnslookupCommands are used to interactively query a doma

ARP Address Resolution ProtocolRIP Routing Information ProtocolOSPF Open Shortest Path FirstIGMP Internet Group Management ProtocolICMP Internet Control Message Protocol Internet Controls Message ProtocolBGP Border Gateway ProtocolHTTP Hypertext Transfer ProtocolFTP File Transfer ProtocolSMTP Simple Mail Transfer ProtocolDNS Domain Name SystemSNMP Simple Network Management ProtocolTCP Transmission Control ProtocolUDP User Datagram Protocol Subscriber Datagram ProtocolATM Asynchronous Transfer mo

1. node. It refers to a computer or computer network device, that is, the basic unit of the entire computer network. 2. Computer Network General Definition: a collection of computers that use certain communication protocols to communicate with each other through transmission media, network devices, and software.

and network address translation NATVPN (Virtual private network) uses the public Internet as the communication carrier between the private networks of the agency. VPN internal use of the private address of the Internet. A VPN must have at least one router with a legitimate global IP address in order to communicate with another VPN on the system over the Internet. All data transmitted over the Internet must be encrypted.Using Network address translati