The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data.
The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names.
The layer at which a device works depends on the Data header information used during its operation. Whe
The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data.
The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names.
The layer at which a device works depends on the Data header information used during its operation. Whe
The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data.
The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names.
The layer at which a device works depends on the Data header information used during its operation. Whe
types of lines, and over five types of lines. Currently, there are more than six types of lines. The third type of twisted pair wires are commonly used as 10 Mbps Ethernet data and voice transmission in the LAN, which complies with the IEEE 802.3 10Base-T standard. TheCat5e twisted pair wiresThe largest LAN market, with a maximum rate of 100 Mbps, complies with the BASE-T standard. Connect the RJ45 crystal head to the RJ45 socket of the network device, such as the NIC or
At present, many small and medium-sized enterprises have similarities in their network environments. If the network quality is not good, there will often be chaos. I have experienced such a thing.
The network of the organization where the author is located is like this: a network cable + an ADSL Router + A multi-port Hub, and several shared Internet PCs are connected to the Hub. Due to the increasing number
. The remainder is reversed (011) and stored in the FCS location.11010011101100000---Add 3 bits to the end of the data series 01011---Factor01100011101100000---XOR results1011---Factor00111011101100000101100010111101100000101100000001101100000101100000000110100000101100000000011000 1011 00000000001110 000 1011 00000000000101 000 101 1-----------------00000000000000 100 ---3-bit remainder The above example uses a 4-bit CRC. The factors used in the Ethernet are 32-bit, to achieve better de
more than one NIC in one of the computers. In this configuration, there are often several specific shared scenarios. Here we subdivide two main solutions, one is no need for any hub devices, that is, without hubs and switches, simply through the network card to achieve the interconnection of three computers. Another scenario we'll mention later.
The equipment required for the previous programme is as follows:
• 5 block 10/100mbps Ethernet card (one
.2. General line network: The main feature of the bus structure is "a common network cable to connect all the computers," this very long line is a "lot of short" cable to connect. It has the advantages of low cost and simple wiring. As long as you buy enough cable, connectors, network cards, you do not need additional network equipment. But there are many disadvantages, first of all, as long as the network of any line failure, the entire network is paralyzed, and "trouble shooting" is a very tro
released on February 12, 2013 to support the SP3 installed under Windows Server 2012, Enterprise users can download as needed.
This series of articles will take the Exchange Server SP1/SP2 as an example, starting with an understanding of the Exchange Server 2010 architecture, to introduce its deployment, role configuration management, mail \ Mailbox Management, backup recovery, high availability, and exchange migration. Let's take a look at the architecture of the Exchange Server2010 first.
E
hubs and switches. The Hub does not have a connection concept. Therefore, each packet received from a port will be copied to another port. However, a vswitch is connected. When a data packet enters from a temporary connection port of the vswitch, the data packet is forwarded to the destination port. Therefore, in a hub environment, we can place our detectors in any location, but for a switch, we must use s
, but the search engine in the indexing, but can be found. This problem has been improved to a certain extent, but it is still not fully eradicated.3Link Analysis SortThe idea of link analysis sorting algorithm, in fact, comes from the paper index mechanism, that is, a paper or literature is quoted more times, then its academic value is higher, the same analogy to the Web page, if the link to a page more, then the importance of the page is higher.Link analysis algorithm is mainly divided into ra
network knowledge.Implementation steps:The server that installs PacktiX VPN must have two connections, one connecting to the internet and the other connecting to the Intranet switch.After the PacketiX VPN Server is installed, start the software and enter the management interface. You can see the [virtual HUB management] and various buttons.Virtual HUB is the core concept of PacketiX VPN. It can bridge with
scenario:
SQL> ALTER DISKGROUP dg_data SCRUB POWERLOW: HIGH: AUTO: MAX;
SQL> ALTER DISKGROUP dg_data SCRUB FILE '+ DG_DATA/MYDB/DATAFILE/filename. xxxx. xx' REPAIR POWER AUTO;
1.5. Active Session History (ASH) for ASM
The V $ ACTIVE_SESSION_HISOTRY dynamic view also provides Active session sampling for the ASM instance. However, the use of diagnostic packages requires permission.
2. GridInfrastructure architecture Enhancement
2.1. Flex Cluster
During cluster installation, Oracle 12c provides tw
In sniffing Ethernet (generally referred to as sniffer can be used for network packet eavesdropping) (sniff) is not a good thing for network security, although network administrators are able to track packets and discover Internet problems, but only if the attacker uses them. Poses a serious security threat throughout the network.As for sniffing (typically, a sniffer can eavesdrop on a network packet that flows through Sniffing within Ethernet (typically a sniffer can eavesdrop on packets flowi
Turn from: The difference between routers, switches, hubsAnother, Layman's watch lively--recommended "switch and router difference"Terminology interpretationRouter: (Router) is a device that connects each LAN and WAN in the Internet. The routing table is recorded in the router, which automatically selects and sets the route according to the channel situation, and sends the signal in the order of the best path. Occurs at the network layer.Switch: A network device used for the forwarding of electr
controller is used as the core to connect the control circuit and interface circuit of the IDE (optical drive and hard drive), USB, Nic, sound card, PCI bus, and docking station.(4) using the LPC bus as the core, they are connected to the SiO2 (Super Input and Output Controller), SMC/KBC (system management controller/keyboard controller), and FWH (firmware hub ), the SiO2 also includes the control circuit of serial port, parallel port, infrared and s
After sorting and digesting the device model, you have the foundation to compile a device driver program.
You need to be familiar with the driver of the USB device because of the working relationship. Therefore, select the driver of the USB device as the start point.
How can a USB device be discovered by the USB System and installed with the corresponding device driver so that the USB device can work properly?
When a USB device connects to the host through a USB interface, it is actually
The OSI Layer-7 model enables reliable communication between different networks of different systems through seven hierarchical structural models. Therefore, its most basic function is to help different types of hosts transmit data.
The node that completes the relay function is usually called a relay system. In the OSI Layer-7 model, the relay systems at different layers have different names.
The layer at which a device works depends on the Data header information used during its operation. Whe
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