computer learning network altoona pa

Computer network learning notes-Computer Network Overview 1. Differences between computer networks and distributed systems 1) Computer Networks (autonomous and interconnected)

Learning Notes: The first chapter--The Computer network overview 1.0 The definition of computer network: Some interconnected, autonomous computers set up called Computer Networks Road. the role of 1.1

56k modem.2. Briefly describe the main content of network management.3. Briefly describe the principles and functions of VLANs.4. Illustrate the working principle and implementation process of vlsm.5. Compare the differences between connection-oriented and connectionless services. 5. Comprehensive questions (6 points for each question, 30 points in total)1. How does IEEE 802.3 Ethernet (etheernet) Media Access Control (MAC) work?2. compare and analyz

Network Learning notes-Computer Network basics 1 What is network: The network is the interface between several computer hosts or network pri

needs to adjust the size of the sub-network.Note: In this way the subnet is divided into subnets, all 0 subnets, and all 1 subnets are available.CIDR (No-class inter-Domain routing protocol):The non-class inter-domain routing protocol allows multiple classes to be merged into a larger network, called a hyper-net.For example, the 192.24,8.0~192.24.15.0 these 8 have a class network, you can synthesize a

bandwidth of 64 KB, which of the following four levels can be obtained for a digital signal at any time?2. If the generated polynomial is 10111 and the information bit is 11111011, obtain the code word generated after the cyclic percentile bit and added to the information bit. If the code is sent by HDLC (bit filling), obtain the sending sequence. 4. Application Questions (6 points per question, 30 points in total)1. Analyze the three concession algorithms commonly used by CSMA technology;2. An

To form a basic network, you need only one hub (hub) or one switch, several NICs, and dozens of-meter UTP lines to complete.In fact, such a simple network is the basic unit of a more complex network. By connecting these small, simple networks together, they form aMore complex local area networks (LANs).3.1 The simplest network650) this.width=650; "Src=" Http://s5

as the data rate or bit rate. Note: The rate is rated or nominal. 2. bandwidth The bandwidth in the communication is the bandwidth of the signal, in Hz, etc. Bandwidth on the computer network refers to the maximum data rate 3. Throughput Throughput indicates the data volume of a network (or channel or interface) per unit time. Throughput is limited by the ban

1_1Starting with David Weatherall's computer Networks, the first lesson is about goals and Motivation,focus of the course is networking, discussing packets and The internet, the bottom communications and the upper distributed systems, is how the network is built and what the top apps can do. The main point is learning how the Internet works, TCP/IP,DNS,HTTP,NAT,V

What is a computer networkThe computer network is a set of interconnected computer-made computers. In layman's parlance, the computer network is the independent computer distributed in

DestMac6B DestIP4BHardware Type: EthernetDestmac: Full 0 placeholder When asked, normal fill when answeringvi. model of LAN1 topological structure Star-shaped structure: easy to manage; large mainframe Total linear structure: High Line utilization, and only two switches at the same time Ring-shaped structure: good real-time, failure of nodes cause paralysis 2 technology to determine LAN characteristics The transmission medium used to transfer data. The topolog

tags are as follows: Type: The fixed value 0x8100 is used to mark VLAN tags; User priority: User priority, used for traffic classification; Flag: The bit is fixed to 0 over Ethernet; VLAN-ID: 0 ~ 4095, used to mark different VLANs. Let's take a look at how it is implemented: Because different VLANs are layer-2 isolated, the range of broadcast domains is effectively controlled by assigning different hosts to different VLANs. In this way, the port can be isolated by adding the vlanid above, packe

Hierarchical model of computer network:From bottom to top: Physical layer, link layer, network layer, Transport layer, application layerThe physical layer (connecting the computer in the form of optical cables, radio waves, etc.) specifies the electrical characteristics of the network, and transmits 0 and 1 of the elec

source host uses the destination host's IP address to query the destination host's physical address.The Physical address is encapsulated in the frame header of the datagram. The typical physical address is the MAC address in Ethernet. MAC address in two places makesUse: The network card in the host is sent to itself by the destination MAC address in the header, and the switch in the network makesUse the de

string. For the algorithm used by ASP. NET (15 random numbers mapped to URL-enabled characters), the probability of a valid ID is randomly estimated to be close to zero. I can't think of any reason to replace the default session ID generator with my session ID generator. In many cases, this will only facilitate attackers. The worst consequence of session hijacking is that once a cookie is stolen or guessed, ASP. NET has no way to detect fraudulent cookie usage. Similarly, ASP. NET restricts it

tail is the frame delimitation (that is, determining the bounds of the frame).Each link layer protocol specifies the maximum length of the data portion of the frame that can be transmitted-the MTU of the largest transmission unit(Maximum Transfer unit).?When the data is a text file consisting of printable ASCII code, a special frame delimiter can be used for frame delimitation.(ASCII code is 7-bit encoding, can be combined into 128 different ASCII code, which can be printed 95, and non-printabl

1_5Traceroute, a command tool, you can see the network internal information, ISP internal information.1_6Understand the modular package of the network. Learning protocols and layers, this construction computer the key mechanism of networks. The package is the lower the protocol the more encapsulated outside, forming a

27.3 "Linux learning is not difficult" Linux Network Command (3): ping command to test connectivity to the target computerUse the ping command to test connectivity to the target computer. The ping command uses the ICMP transport protocol to emit information that requires a response, and if the remote host has no problem with the

formula:– The maximum data transfer rate for a channel with limited bandwidth and noise interference. –C = W log2 (1+s/n) (BITS/S)• W is the channel bandwidth (in Hz);• S is the average power of the signal transmitted within the channel;• N is the Gaussian noise power inside the channel. s/n commonly used decibels, 1 decibels =10lgs/n5. Data encoding Technology(1) Pulse code modulation pcm--analog data to digital signaloperation: Sampling, quantization, encodingApplication: Voice digitization(2

processing. If the group received is a group that exchanges route information, the Group will be handed over to the route selection processor. If the group receives data, the query forwarding table is displayed, the forwarding organization forwards the data group from the appropriate output port. The input port is used to process the received packets as follows: Correspondingly, the processing process of the output layer is as follows: As an important part of a vro, the exchange mechanism ac