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The first two days of the engine room a Cisco2960 of the port often down, at that time let the engine room restart switch also useless, later let change a mouth on the recovery, but over a period of time the port will be down, on-line check may be due to the port-security of the Cisco switch caused the port down, Later to the computer room connected to the switch

Linux system, sometimes the ordinary user some things can not be done, unless it is the root user can do. Then you need to useThe SU command temporarily switches to root to work.su:substitute[' s?bst?tju?t] instead of userThe syntax for SU is:SU [option parameter] [user]-,-L,--login log in andChange to the user environment of the switch;-C,--commmand=commandExecutes a command and then exits the user environment that was switched to;When you

== 20 ){ System.out.print("Value of X is 20"); }else if( x == 30 ){ System.out.print("Value of X is 30"); }else{ System.out.print("这是 else 语句"); }}}The results of the above code compilation run as follows:Value of X is 30Nested IF...ELSE statementsIt is legal to use nested IF...ELSE statements. This means that you can use an if or ElseIf statement in another if or ElseIf statement.GrammarThe nested IF...ELSE syntax format is as follows:if (Boolean expression 1) {If the value of t

Java Branching Structure-if...else/switchSequential structures can only be executed sequentially, not judged and chosen, so branching structures are required.There are two types of branching structures in Java: if statement Switch statement If statementAn If statement contains a Boolean expression and one or more statements.GrammarThe syntax for the IF statement is as follows:if (Boolean expression) { // If the Boolean expre

Topic Analysis Given N (n Solution: Because the switch only turn on and off two kinds of state, so for each switch to open and close, combined with a total of 2^n, enumerate all the circumstances of the feasibility, for this amount of data is unrealistic, need to find ways to optimize.We use X[i] to represent the operation State of the first switch (1 for operat

In an IF condition statement, a logical condition can only have one, and if there are multiple conditions, it can be resolved using nested IF statements, but this method increases the complexity of the program and reduces the readability of the program. Using the switch Process Control statement can solve these problems perfectly, with the following basic structure: Switch statement syntax The

The front panel of the switch has several LEDs to monitor the system's activity and performance. These LEDs are called light-emitting diodes (LEDs). The LEDs on the front panel include: • System LEDs • Remote power supply LEDs • Port Mode LEDs • Port Status Indicator First, the system led Displays whether the system is plugged in and working properly. LED Color System State Shutdown system not powered up Green system running normally Amber s

August 2012, the current network use of a ZTE 2826 switch can not remote Telnet logon situation, ping switch network management IP address serious packet loss. The process is probably as follows: 1, the site through the console port login switch to confirm the normal equipment configuration. 2, the use of test terminals to configure IP address, connected to the

Compared with the layer-3 switch, the layer-4 switch has a good improvement in its functions and features. Here we have explained the basic knowledge of the layer-4 switch. The amount of transmitted audio, video, data, and other information in the network system is full of bandwidth. We have to provide differentiated services for these data traffic, so that laten

When the main performance of a LAN cannot meet the new application requirements of an enterprise, you must consider upgrading the network. During the upgrade, you should analyze the problems to be solved based on the requirements of network applications, especially the upgrade of switch hardware devices. This article will discuss this issue with you. Upgrade network devices 1. Principles for selecting upgraded network devices When selecting a network

How to solve the problem of Ethernet switch parameters the switch can be divided into Layer 2 switches, Layer 3 switches, and Layer 4 switches according to the working protocol layer, you can divide network-managed switches and non-managed switches based on whether the network management function is supported. This article will describe how to set parameters for the Ethernet

First of all, the Cisco, the orders are not many, are basic. Not including STP, upgrades, Acl,web and the like.Ruijie and Cisco 99% are similar.CISCO layer-2Switch>go to HyperTerminal console switch>Enable access switch privileged mode switch#configure terminal Enter switch global configuration mode

Now, we are accustomed to using shortcut keys to switch input method. However, the user found that their own input method can not switch. So, what's not going to happen? Next, small compilation of input method can not switch the solution. Input method can not switch how to solve In general, resulting in "CRTL"

Two-layer switch refers to only the second layer of OSI (data Link Layer) Exchange technology of the switch, the development of two-tier exchange technology is more mature, the two-tier switch is a data link layer equipment, can identify the data packet MAC address information, based on the MAC address forwarding, and record these MAC addresses with the correspon

Problem:Break plays a role in the loop flow control of the for loop, while loop, and stops execution of the statement after the break, jumps out of the loop, and jumps out of the loop control body;In the switch condition selection, there is no circular control, what is the role of the break? Solution:1. The execution flow of the switch statement is:The value of the expression in the parentheses after the

physical network and geographical location. A virtual workgroup can contain departments and workgroups in different locations, without having to physically reconfigure any ports to actually implement network users regardless of their physical location. The virtual network technology divides the traditional broadcast domain into each independent sub broadcast domain, restricts the broadcast to the virtual workgroup, because of the reduction of broadcast domain, the proportion of broadcast packet

1. Enter the global configuration mode. Select Switch-3548> enablePassword :********Change-3548 # config tChange-3548 (config )# 2. Enable the HTTP Server of the vswitch Switch-3548 (config) # ip http server 3. Configure the Host Name Switch-3548 (config) # hostname Switch-PHY-3548 4. Configure the superuser p

There are many things worth learning about security switches. Here we mainly introduce the meanings and new functions of the layer-3 security switch. Security Switch-the new darling of the network industry, the gatekeeper of the network entry, is aiming to raise a large knife to all insecure factors. With the advent of the Internet era, security issues have become an urgent issue. The existence of viruses,

CISCO 3750 Dual Switch stack operation, cisco3750 dual Double switch stack operation I. Basic Requirements: The ios version must be consistent with the dedicated stack module and stack cable, and the maximum number of stacks is 9. Ii. Stack advantages: High-density ports, easy to manage, and stacked switches can be regarded as a unified configuration of a switch

View C # (2) through IL) Switch Statement (lower) Address: http://www.cnblogs.com/AndersLiu/archive/2008/11/06/csharp-via-il-switch-2.html Original: Anders Liu Abstract: The switch statement is a common jump statement in C #. Different codes can be executed based on different values of a parameter. This article introduces the IL code generated by the compiler whe