An engineer who has worked in the network industry for 10 years says that the first important thing in network construction is the demand, the second is the demand, and the third is the demand. It can be said that the user needs directly determine the purchase of equipment. After making the user needs, from a plane angle to make reasonable equipment purchase.
So how do we choose the two-tier switch we need?
1. Back Plate Bandwidth
Backplane bandwid
Test topologyEnvironment: DHCP server and DHCP clients belong to the same VLAN, but clients belong to different switches, and the L2 and L3 switches turn on DHCP snooping to concludeconfiguration of the L3 switch172.28.27.0 255.255.255.0172.28.27.254 172.28.28.15 ! ! 27IP DHCP snooping information option allow-untrusted //must add this command because the L3 switch also has DHCP snooping turned on, as explained belowIP DHCP snoopin
The Switch...case statement in Swift can determine the object type, and the objective-c must be an integer.Can not penetrate, can not write break,
var rank = "A"
switch rank{case
"a"://equivalent to if
print ("excellent") Case
"B"://equivalent to else if
print ("excellent")
case "C"://equivalent to else if
print ("excellent")
default://equivalent to else
print ("no rating")
}
The IDC report shows that the switch market has maintained a high growth momentum in recent years, and the market is expected to reach $1.51 billion by 2009. Switch in the enterprise network occupies an important position, is usually the core of the entire network, this position makes it become the focus of hacker intrusion and virus rampant, in order to protect their own network security, enterprises need
The IDC report shows that the switch market has maintained a high growth momentum in recent years, and the market is expected to reach $1.51 billion by 2009. Switch in the enterprise network occupies an important position, is usually the core of the entire network, this position makes it become the focus of hacker intrusion and virus rampant, in order to protect their own network security, enterprises need
How to quickly resolve switch faults and effectively improve network efficiency. Please refer to this article for details:
1. Solve the trouble of resetting VLAN
When managing and maintaining a LAN, if the cascade port connecting to a common switch changes, the VLAN previously configured in the switch system may not work normally. In this case, do we have to re-
The first thing you need to do is to switch between the applications that are currently in use, and to turn on the "when I swipe from the left to the middle, switch directly to the recently used Apps" feature.
Apply Toggle Settings
First, use the mouse to switch directly
In the WIN8 system, when you need to sw
In the switched Ethernet environment, the communication between the two workstations is not heard by the third party. In some cases, we may need to do such listening, such as protocol analysis, traffic analysis, intrusion detection. For this we can set the span (switchedportanalyzer Switch Port Analyzer) feature of the Cisco switch, or the early "port mirroring", "Monitoring port" feature. The object that
With the gradual deepening of network application, the Telecom class switch, especially the three-layer switch, has become the focus of the market contention. However, in different functions, a wide range of switch equipment, users how to remove the fog, to find their own application characteristics of the product? This not only requires users to start from the t
At present, the market support Gigabit Ethernet Technology Gigabit Switch products are numerous, manufacturers are also more, how to choose the right equipment in these varieties of equipment, is a need to carefully consider, time-consuming to understand and difficult to weigh the choice of the problem.
Therefore, generally in our evaluation of equipment selection, we should pay attention to the following aspects: Product type, the product support gi
Switching between the pure view
Single document multi-view switching is one of the most difficult problems I have encountered in learning MFC. I feel that the view switch is divided into three levels, the first is to switch the view class in the case of the non-segmented panes, the second is to switch the experiment view in one pane of the pane, and the third
The is only so called "advanced" usage because I have not mastered the most basic usage of the switch, so, the following is actually the basic usage of it! The Switch statement is similar to a series of IF statements that have the same expression. There are many situations where you need to compare the same variable (or expression) with a number of different values and execute different code based on wh
Recently saw a lot of people asking about the switch, hub, router is what, function, what is the difference, the author on these questions to do some simple answers.
First of all said Hub, that is, hubs. Its role can be simply understood to connect some machines to form a local area network. A switch (also known as a switched hub) works roughly the same as a hub. But there is a difference in performance: t
the trunk port is that the hybrid port can allow multiple VLAN messages to be sent without tagging, while the trunk port allows only the default VLAN messages to be sent without tagging.Table 1-9 Setting the link type of the Ethernet portOperationCommandSet Port to access portSwitch (config) #interface range g0/21-22Switch (config) #switchport mode accessSet Port to hybrid portSwitch (config) #interface range g0/21-22Switch (config) #switchport mode hybridSet Port to trunk portSwitch (config) #
Https://zm12.sm-tc.cn/?src=http%3A%2F%2Fwww.sydzdiy.com%2Fsynthesize%2Fbase%2F110Q393H010.htmluid= D2f68cd7fd230c162b7fa451ccf2ceb0hid=28152800f38bb65ef14cc551242bc441pos=6cid=9time= 1479132129718from=clickrestype=1pagetype=0000004000000402bu=structure_web_infoquery=% E5%88%80%e5%bc%80%e5%85%b3%e8%8a%af%e7%89%87mode=uc_param_str=dnntnwvepffrgibijbprsvdseiCommon analog switch chip pin, function and application circuitCMOS analog
With the development of the times and the development of science and technology, the layer-4 switch technology is also widely used for everyone. It can take corresponding actions based on the observed information, implement the key functions of bandwidth allocation, fault diagnosis, and access control over TCP/IP application data streams.
With the increasing popularity of Mbit/s, Gbit/s, and even Mbit/s local area networks, broadband MAN networks and
In order to improve the LAN operation and maintenance efficiency, we need to accumulate various switch troubleshooting experience at ordinary times so that the switch can be quickly rectified in case of a fault, this article has contributed several vswitch troubleshooting skills to my friends. I hope these content will help you!
1. Solve the trouble of resetting VLAN
When managing and maintaining a LAN, if
Reasonable configuration solves the problem of Switch network loop, in the way of judging switch network loop, this paper makes a preliminary analysis of switch network loop problem from log information and enabled state, then rationally configures the switch and finally solves the
Today, when the plug-in boxscroll, because if the conditions inside the judge more than two, so immediately want to rewrite switch. Change to half, suddenly remember Jshint and other code quality testing tool in a request, with = = = Replace = =, without unreliable forced transformation. Then suddenly guess, change to switch will not reduce efficiency ah? Switch
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