example, in most networks, CDP can provide a lot of useful information and assist administrators in network troubleshooting and performance optimization. However, the potential security risks cannot be ignored. By default, the switch sends system information on all interfaces by default (as described above, these system information contains some sensitive information and is not encrypted ). Therefore, attackers can easily obtain this information through tools such as network
This time, we will mainly explain the issues related to the daytime protocol and time protocol. Let's take a look at the content of the daytime protocol and time protocol. In a LAN, many systems require that each computer maintain time consistency. The WIN2000 system provides the time synchronization function with the
8.1 Address Mapping
At the network level, hosts and routers are identified by their logical addresses (IP addresses). The logical address is unique globally.
At the physical level, hosts and routers are identified by local addresses. 8.1.1 Static Mappings
Map physical and logical addresses to a single table. Save to each machine, Cons: Need to update 8.1.2 dynamic Mappings periodically
Use protocols to find static addresses based on logical addresses. There are currently two types of protocols:
The ARP Address Resolution protocol is a TCP/IP protocol that obtains physical addresses based on IP addresses. It works in the second layer of the OSI seven-layer model-the data link layer.Using the ARP Address Resolution protocol, the destination hardware address (MAC address) information can be resolved according to the IP address information in the IP packet
Registering an application to a URL protocol (http://msdn2.microsoft.com/en-us/library/aa767914.aspx)
ArticleAbout asynchronous pluggable protocols describes how to develop and process a new protocol.Program(Processor handlers ). In some cases, we may describe how to call another application to process custom protocols ). Register an existing application as a URL protocol processor. Once the application i
Mysql communication protocol and mysql communication protocol
1. Mysql connection method
To understand the communication protocol of Mysql, you must first know the connection method used to connect to the Mysql server. The main connection methods of Mysql include Unix socket, Memory sharing, and named pipe, TCP/IP socket.
1.1Unix socket
In Linux and Unix environm
The Session Description Protocol (SDP) provides multimedia session descriptions for session notifications, session invitations, and other forms of multimedia session initialization.
The session directory is used to assist with multimedia conference announcements and send relevant settings for session participants. SDP is used to transmit this information to the receiving end. SDP is completely a session description format-it is not a Transport
Android implements the snmp protocol (1) and android implements the snmp protocolEarly January 2015. I received a call from a Huawei instructor and asked me to help me develop an App they would use at the Beijing Exhibition, this App can display the running status of Huawei's network devices and set some simple parameters, including AP, LSW, AP and AR.The Huawei instructor told me that they managed the protocol
Protocol for Ios development: protocol for ios development
Protocol is a difficult and important point in ios development. To use it well or understand it well, it may take time to accumulate. Today, let's take a simple look at how to use protocol through an example.
The example we use today is to simulate computer ins
Protocol buffers: An extensible way to serialize structured data, language neutrality, platform neutrality, and data protocols for communication protocols, data storage, and much more, think of Xml,json, but smaller, simpler and faster than XML.
Protocol buffers is a flexible and efficient automated mechanism for serializing structured data. All you need to do is define how you want the data to be organized
later had the session and the like.Actual Combat preparation work:On the monitoring network, the Windows platform has a good software called Sniffer, which is also a lot of "hackers" often used sniffer tools. When studying the HTTP protocol, we recommend that you use aA tool called HttpWatch. (Unfortunately, the tool is chargeable.) What to do, you know). After
had the session and the like.actual Combat preparation work:On the monitoring network, the Windows platform has a good software called Sniffer, which is also a lot of "hackers" often used sniffer tools. When studying the HTTP protocol, we recommend that you use aA tool called HttpWatch. (Unfortunately, the tool is chargeable.) What to do, you know). After the in
later had the session and the like.Actual Combat preparation work:On the monitoring network, the Windows platform has a good software called Sniffer, which is also a lot of "hackers" often used sniffer tools. When studying the HTTP protocol, we recommend that you use aA tool called HttpWatch. (Unfortunately, the tool is chargeable.) What to do, you know). After
later had the session and the like.Actual Combat preparation work:On the monitoring network, the Windows platform has a good software called Sniffer, which is also a lot of "hackers" often used sniffer tools. When studying the HTTP protocol, we recommend that you use aA tool called HttpWatch. (Unfortunately, the tool is chargeable.) What to do, you know). After
Protocol (Protocol)Protocol is common in iOS, the protocol is a set of standards, similar to a list, it says that there are some things to be done, it depends on who signed the agreement, if who signed the agreement, then it will achieve (complete) the agreement required to complete the things.Create
Simple implementation of Mina custom protocol and mina custom protocol
Because the company needs to create an automatic weighing system for electronic scales and implement a custom protocol, Mina is used for simple implementation. Because it is relatively simple, code is directly used. Change to Netty if you have timeServer
Package net. heartma. server; import ja
One-phase commit protocol and two-phase commit protocol for transactions
Because transactions need to implement ACID, that is, atomicity, consistency, isolation, and durability, a certain mechanism is required to ensure that transactions are committed in stages.
XA: XA protocol, which specifies the Transaction Manager and resource manager interfaces and adopts th
Http protocol and http protocol details
HTTP is an object-oriented protocol at the application layer. It is applicable to distributed hypermedia information systems due to its simple and fast method. It proposed in 1990 that, after several years of use and development, it has been continuously improved and expanded. Currently, the sixth version of HTTP/1.0 is use
"Protocol" is an indispensable concept for understanding servers and networks."Agreement (Protocol)" has the meaning of "rules, provisions".In fact, the function of "protocol" is very wide, in the field of communication, "protocol" provides "in the communication, in what circumstances, in what order, what kind of way t
The registration and initialization process of the pci NIC Driver is implemented. the TCP/IP protocol stack and the pci protocol stack are implemented after soft interruptions occur.0x01 reason
The purpose of this study is to follow the outline below:
The three handshakes, data transmission, and four handshakes are debugged by the server client program.
The setup environment is as follows: debug the Linux k
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