thinkful isa

map outside_map 20 match address outside_20_cryptomapCrypto map outside_map 20 set peer 192.168.0.2Crypto map outside_map 20 set transform-set ESP-3DES-SHACrypto map outside_map interface outsideNat (inside) 0 access-list inside_nat0_outbound tcp 0 0 udp 0In this way, a simple ipsec vpn is built. Is it simple?Note: If you use ASDM in the graphic interface, you must note that the wizard location of ipsec vpn has changed in version 6.0 or later and moved to the top menu.Second, the second off: PI

class; In the program run, dynamically add properties/methods to a class, modify properties/methods; Traverse all member variables/properties/methods of a class; (2) method invocation:If you invoke an instance method with an instance object, it will go to the object that the instance's Isa pointer points to (that is, the class object, yes, the class is also an object) operation. If a class method is called, it is manipulated into the obj

low-level C language library usually we write the OC code will be turned into runtime to executeCharacteristics:动态类型：程序直到执行时才能确定所属的类。动态绑定：程序直到执行时才能确定实际要调用的方法。动态加载：根据需求加载所需要的资源Runtime message mechanismThe class of obj is first found through the ISA pointer of obj. First check whether this selector is to be ignored. For example, Mac OS X was developed, and garbage collection ignores retain,release of these functions. Detecting whether the

class type, which is actually a reference to thePointer to the Objc_class struct.struct object_class *ClassIt is defined as follows:See the definition of objc_class struct in objc/runtime.h as follows:struct object_class{class Isa objc_isa_availability;#If!__objc2__ Class super_class objc2_unavailable;Parent classConstChar *name objc2_unavailable;Class namelong version objc2_unavailable; //The version information of the class, the default is 0 long i

Summary: This article describes how to install Internet Security and Acceleration (ISA) Server and configure it as a firewall. To install the ISA Server schema to Active Directory, you must be an administrator on the local computer. In addition, you must also be a member of the Enterprise Admins and Schema Admins two groups. You must install the ISA Server schema

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intrusion detection. This process should be triggered to prevent attacks, and the protection should be continuously monitored in real time. This process can only be considered as part of a protection policy at this time. Otherwise, the NID system is more like a tool that provides review records after an attack occurs. There are many enterprise-level network intrusion detection systems available for network designers. They can be independent devices or systems integrated into other network servi

1: Class class:Typedef struct objc_class * class;From the definition of Class, we can see that it is a pointer to the objc_class structure type. What is objc_class? Struct objc_class {struct objc_class * ISA; struct objc_class * super_class; // The root value is null const char * Name; long version; long Info; long instance_size; struct objc_ivar_list * ivars; // instance variable struct objc_method_list ** methodlists; // method list struct objc_cach

bar.Add Listener [Self. TableView Addobserver:Self Forkeypath:@ "Contentoffset" options:Nskeyvalueobservingoptionnew Context:NIL];/** * Callback */-when the Listener property value has changed (void) Observevalueforkeypath: (nsstring *) KeyPath OfObject :(id) object change: (nsdictionarynsstring *,id> *) Change context: ( void *) context{cgfloat offset = Self.tableview.contentoffset .Y; cgfloat delta = offset/64.F + 1.F; Delta = MAX (0, Delta); [self alphanavcontroller].baralpha = MIN (1, Delt

FTP PASV and port, support the IRC, such as DDC dynamic port mode, install the firewall do not need to set PASV port) 6. Port mapping function 7. Flow control 8. Use the most advanced data stream fingerprint technology, provide powerful DOS (denial of service) attack protection, complete protection of various known and unknown Dos attacks. 9. Flow Analysis and monitoring 10. Real-time Access connection monitoring 11. Support the establishment of the DMZ area 12. Account number, authority manage

Source: ISA Chinese site ISA Server does not provide MAC address control function, why? This is because the MAC address can only be used in the local network. When a packet crosses the router, the source MAC address of the host in the packet will be replaced by the MAC address of the router's outbound interface, in this case, MAC address control is not applicable. Therefore, enterprise-level hardware or s

OBJECTIVE-C 2.0 's run-time environment called Morden Runtime,ios and Mac OS X 64-bit programs all run onThis environment, which means that the Mac OS X 32-bit program runs in the old OBJECTIVE-C 1.0 Runtime Environment legacyruntime, here we only explain the Morden runtime.The interaction with the runtime is mainly in three different places, namely the A.objective-c source code (for example, the category you defineis automatically added to the original class at run time, and the B.nsobject meth

We can find the definition of class and object in/usr/include/objc/objc.h and runtime.h: typedef struct OBJC_CLASS *class; typedef struct OBJC_OBJECT { Class isa; } *id; Class is a pointer to a objc_class struct type, and an ID (any object) is a pointer to a objc_object struct type whose first member is a pointer to a objc_class struct type.Note that there is a key explanation: the memory layout with a objc_class pointer for all the things that

In centos, you can use lm_sensors to view the CPU temperature (of course, your hardware must support it first). to use this function, you must support kernel-related modules (such as I2C, the operation method is as follows: Check whether lm_sensors is installed on your machine, $ rpm-qlm_sensors if not installed first install $ sudoyuminstall-ylm_sensors check in centos system can use lm_sensors to view the CPU temperature (of course, your hardware must first support ), to use this function, ker

(IRQ 4 (MODE + E ))) 　　 # DMA 5 　　 (DMA 0 (CHANNEL 5 )) 　　 # DMA 7 　　 (DMA 1 (CHANNEL 7 )) 　　 # I/O Base Address 2 0x0100, range 8 　　 (IO 1 (SIZE 8) (BASE 0x0100 )) 　　 # Card name 　　 (NAME "GVC5005/256 [0] {LT Win Modem }") 　　 # Activate 　　 (Act y) 　　 # End configuration 　　 )) 　　 ####### The parameters for my other ISA devices ############## 　　 # Returns all cards to the "Wait for Key" state 　　 (WAITFORKEY) 　　 3. install the cat driver 　　 You do not

UART, And the asynchronous communication function of the MCS-51 is basically the same. Ii. System Bus 1. ISA bus (Industrial Standard Architecture) bus standard is a system bus standard established by IBM in 1984 to launch a PC/AT machine, so it is also called at bus. It is an extension of the XT bus to meet the requirements of the 8/16-bit data bus. It is widely used in the 80286-80486 era, so that there are still

In Linux, you can use lm_sensors to view the CPU temperature (of course, your hardware must support it first). to use this function, you must support kernel-related modules (such as I2C, next let's talk about the operation method: first check whether your machine has installed lm_sensors, $ rpm-qlm_sensors... in Linux, you can use lm_sensors to view the CPU temperature (of course, your hardware must support it first). to use this function, you must support kernel-related modules (such as I2C, th

Article title: WINmodem and Linux Configuration Implementation Guide (1 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Author: Alexander J 　　 This document describes how to run Winmodem in Linux. 　　 1. what is Tom? 　　 1.1 they are cats ...... 　　 1.2... but it's not the same as a real cat! 　　 1.3 How do I know that I took the cat? 　　 　　 　　 2. is it

to find the corresponding method implementation. Its data structure is: typedef struct OBJC_SELECTOR *sel; We can see that it's a C string mapped to a method, and you can get a sel-type method selector by objc the compiler command @selector () or the Sel_registername function of the Runtime system. Attention:Methods with the same name in different selector are the same, and because of the variable types, they do not cause them to invoke the method to achieve confusion. ID An ID is a parameter

a USB socket for the next USB device, in which case a USB controller can connect up to 127 peripherals, and the distance between each peripheral can reach 5 meters. USB Unified 4-pin round plug will replace many of the chassis after the string/mouth (mouse, MODEM) keyboard and other plugs. 　　USB can intelligently identify the insertion or disassembly of peripheral devices on the USB chain. In addition to being able to connect keyboards and mice, USB can also connect to low speed peripherals suc