wifi的相关知识

优质回答与知识(10)

自己买书学去吧。

2020-08-30 16:49:03

你是做航测的?

2020-08-30 14:30:11

1.TCP/IP协议栈共有四层,它们分别是____应用层______层、______传输______层、_____网络互连______层、________主机到网络_______层,其中IP属于__网络__________层的协议,HTTP属于__应用___________层的协议,TCP属于__传输____________ 层的协议,HTTP属于___应用___________层的协议。2.企业网络的层次设计模型把网络划分为三层,这三层分别是___接入__________层、_____汇聚__________层和_____核心______________层。3.动态路由协议可以分为距离矢量路由协议和链路状态路由协议,RIP属于_____距离矢量_______________________:OSPF属于___链路状态_____________________。4.在思科的路由器中,静态路由的默认管理距离值为____1_____,RIP路由的默认管理距离值为____120______,OSPF路由的默认管理距离值是___110__________。1.( )路由器可以用于连接不同的局域网或广域网,故称为____C______。A、扩展器 B、流量分析器C、网关 D、服务器阵列2.(   D  )VTP协议的作用是____________。 A. 路由器间相互学习路由   B.给主机分配IP C.提高网络的传输效率 D.交换机之间互相学习VLAN配置3.( D )指出下面选项中,哪项不是路由器和交换机的硬件组成? A. 闪存 B. 中央处理单元 C. 控制台端口 D. 显卡1、( 对  )NTP是指网络时间协议。2、(  √ )交换机与交换机互连的端口应该设为TRUNK模式。3、(   对 )PC机的网关必须和IP地址同一个网段。4、( 对  )静态路由是网络管理人员人工输入的。5、( 记不清了 )在路由表中,用C开头的路由表记录表示直连路由。6、( × )192.168.10.17/28和210.36.149.155/24属于同一网段。7、( × )RIP动态路由协议属于链路状态路由协议。

2020-08-29 20:50:48

1、TCP/IP协议分为四层,分别是:应用层、传输层、网络层(网络互联层)、物理层(主机到网络层),其中IP属于网络层,HTTP属于应用层协议,TCP属于传输层协议。2、企业网络的层次结构分别为:核心层,汇聚层,接入层。3、RIP属于距离矢量路由协议,OSPF属于链路状态路由协议。4、思科路由器中,各种路由默认管理值分别为:静态路由(1),EIGRP汇总(5),OSPF(110),RIP(120),EBGP(20),EIGRP(90),IGRP(100),外部EIGRP(170),IBGP(200),未知(255)。选择题 CDD判断题:对错对对对错错判断题第二题,交换机之间互联的时候,也可以配置成为访问(ACCESS)模式

2020-08-29 20:31:43

请问一下你是那里的啊?如果你只是想了解一下相关的法规,可以到弗锐达的相关网站进行查阅,如果你是想要有专家现场的培训,可以到你们所在地的省药监局看看有没有相关连部门或者咨询公司举行的培训。

2020-08-30 15:49:24

12月 23日- 24日有个灭菌医疗器械包装及EO灭菌确认和常规控制培训班在广州,详情去奥咨达了解

2020-08-30 14:50:15

是不是与灭菌医疗器械医疗器械包装、环氧乙烷灭菌基础知识、环氧乙烷灭菌常规控制等相关知识,12月份奥咨达有个,去问下具体情况。

2020-08-30 16:26:56

不需要,多看看人家直播

2020-08-30 14:55:54

这个还是需要专业的指导的。你要学会如何锁粉。

2020-08-30 16:25:12

在ios扫描公共区域内wifi信息中,写了实现wifi扫描的一种方法,但是那种方法扫描出来的wifi信息不全,下面是扫描全部wifi信息的实现方法:#import<CoreFoundation/CoreFoundation.h>#import<Foundation/NSTimer.h>#import<Foundation/Foundation.h>#include<dlfcn.h>#include<ifaddrs.h>#include<arpa/inet.h>@interfaceMSNetworksManager:NSObject{NSMutableDictionary*networks;NSArray*types;intautoScanInterval;boolscanning;boolautoScanning;void*libHandle;void*airportHandle;int(*open)(void*);int(*bind)(void*,NSString*);int(*close)(void*);int(*associate)(void*,NSDictionary*,NSString*);int(*scan)(void*,NSArray**,void*);//int(*open)(void*);//int(*bind)(void*,NSString*);//int(*close)(void*);//int(*scan)(void*,NSArray**,void*);//int(*associate)(void*,NSDictionary*,NSString*);int(*getpower)(void*,char*);int(*setpower)(void*,char*);}+(MSNetworksManager*)sharedNetworksManager;+(NSNumber*)numberFromBSSID:(NSString*)bssid;-(NSMutableDictionary*)networks;-(NSDictionary*)networks:(int)type;-(NSDictionary*)network:(NSString*)aNetwork;-(id)init;-(void)dealloc;-(int)numberOfNetworks;-(int)numberOfNetworks:(int)type;-(int)autoScanInterval;-(void)scan;-(void)removeNetwork:(NSString*)aNetwork;-(void)removeAllNetworks;-(void)removeAllNetworks:(int)type;-(void)autoScan:(bool)scan;-(bool)autoScan;-(void)scanSelector:(id)param;-(void)setAutoScanInterval:(int)scanInterval;-(int)associateNetwork:(NSDictionary*)bss:(NSString*)password;-(int)getPower:(char*)power;-(int)setPower:(char*)power;-(NSString*)localIPAddress;@end.m文件:#import"MSNetworksManager.h"staticMSNetworksManager*NetworksManager;@implementationMSNetworksManager+(MSNetworksManager*)sharedNetworksManager{if(!NetworksManager)NetworksManager=[[MSNetworksManageralloc]init];returnNetworksManager;}+(NSNumber*)numberFromBSSID:(NSString*)bssid{intx=0;uint64_tlongmac;intMAC_LEN=6;shortunsignedint*bs_in=malloc(sizeof(shortunsignedint)*MAC_LEN);if(sscanf([bssidcStringUsingEncoding:[NSStringdefaultCStringEncoding]],"%hX:%hX:%hX:%hX:%hX:%hX",&bs_in[0],&bs_in[1],&bs_in[2],&bs_in[3],&bs_in[4],&bs_in[5])==MAC_LEN){for(x=0;x<MAC_LEN;x++)longmac|=(uint64_t)bs_in[x]<<((MAC_LEN–x–1)*8);}else{NSLog(@"WARN:invalidmacaddress!%@",self);}free(bs_in);return[NSNumbernumberWithUnsignedLongLong:longmac];}-(NSDictionary*)networks{//TODO:Implementjoiningofnetworktypesreturnnetworks;}-(NSDictionary*)networks:(int)type{//TODO:Implementselectingofnetworktypesif(type!=0)NSLog(@"WARN:Non80211networksarenotsupported.%@",self);returnnetworks;}-(NSDictionary*)network:(NSString*)aNetwork{return[networksobjectForKey:aNetwork];}-(id)init{self=[superinit];NetworksManager=self;networks=[[NSMutableDictionaryalloc]init];types=[NSArrayarrayWithObjects:@"80211",@"Bluetooth",@"GSM",nil];[typesretain];autoScanInterval=5;//seconds//ForiPhone2.0//libHandle=dlopen("/System/Library/PrivateFrameworks/Apple80211.framework/Apple80211",RTLD_LAZY);//ForiPhone3.0libHandle=dlopen("/System/Library/SystemConfiguration/WiFiManager.bundle/WiFiManager",RTLD_LAZY);open=dlsym(libHandle,"Apple80211Open");bind=dlsym(libHandle,"Apple80211BindToInterface");close=dlsym(libHandle,"Apple80211Close");scan=dlsym(libHandle,"Apple80211Scan");associate=dlsym(libHandle,"Apple80211Associate");getpower=dlsym(libHandle,"Apple80211GetPower");setpower=dlsym(libHandle,"Apple80211SetPower");open(&airportHandle);bind(airportHandle,@"en0");returnself;}-(void)dealloc{close(&airportHandle);[superdealloc];}-(int)numberOfNetworks{return[networkscount];}-(int)numberOfNetworks:(int)type{//TODO:Implementselectingofnetworktypesif(type!=0)NSLog(@"WARN:Non80211networksarenotsupported.%@",self);return[networkscount];}-(int)autoScanInterval{returnautoScanInterval;}-(void)scan{//NSLog(@"Scanning…");scanning=true;[[NSNotificationCenterdefaultCenter]postNotificationName:@"startedScanning"object:self];NSArray*scan_networks;NSMutableDictionary*parameters=[[NSMutableDictionaryalloc]init];[parameterssetObject:@"YES"forKey:@"SCAN_MERGE"];scan(airportHandle,&scan_networks,parameters);inti;//boolchanged;[networksremoveAllObjects];for(i=0;i<[scan_networkscount];i++){[networkssetObject:[[scan_networksobjectAtIndex:i]objectForKey:@"BSSID"]forKey:[[scan_networksobjectAtIndex:i]objectForKey:@"RSSI"]];}NSLog(@"ScanFinished…");}-(void)removeNetwork:(NSString*)aNetwork{[networksremoveObjectForKey:aNetwork];}-(void)removeAllNetworks{[networksremoveAllObjects];}-(void)removeAllNetworks:(int)type{if(type!=0)NSLog(@"WARN:Non80211networksarenotsupported.%@",self);[networksremoveAllObjects];}-(void)autoScan:(bool)bScan{autoScanning=bScan;if(bScan){[selfscan];[NSTimerscheduledTimerWithTimeInterval:autoScanIntervaltarget:selfselector:@selector(scanSelector:)userInfo:nilrepeats:NO];}NSLog(@"WARN:Automaticscanningnotfullysupportedyet.%@",self);}-(bool)autoScan{returnautoScanning;}-(void)scanSelector:(id)param{if(autoScanning){[selfscan];[NSTimerscheduledTimerWithTimeInterval:autoScanIntervaltarget:selfselector:@selector(scanSelector:)userInfo:nilrepeats:NO];}}-(void)setAutoScanInterval:(int)scanInterval{autoScanInterval=scanInterval;}-(int)associateNetwork:(NSDictionary*)bss:(NSString*)password{if(bss!=nil){NSLog(@"associateNetwork");intret=associate(airportHandle,bss,password);returnret;}elsereturn-1;}-(int)getPower:(char*)power{returngetpower(airportHandle,power);}-(int)setPower:(char*)power{returnsetpower(airportHandle,power);}-(NSString*)localIPAddress{NSString*address=@"error";structifaddrs*interfaces=NULL;structifaddrs*temp_addr=NULL;intsuccess=0;//retrievethecurrentinterfaces–returns0onsuccesssuccess=getifaddrs(&interfaces);if(success==0){//Loopthroughlinkedlistofinterfacestemp_addr=interfaces;while(temp_addr!=NULL){if(temp_addr->ifa_addr->sa_family==AF_INET){//Checkifinterfaceisen0whichisthewificonnectionontheiPhoneif([[NSStringstringWithUTF8String:temp_addr->ifa_name]isEqualToString:@"en0"]){//GetNSStringfromCStringaddress=[NSStringstringWithUTF8String:inet_ntoa(((structsockaddr_in*)temp_addr->ifa_addr)->sin_addr)];}}temp_addr=temp_addr->ifa_next;}}//Freememoryfreeifaddrs(interfaces);returnaddress;}@end添加到项目中即可。本回答被提问者和网友采纳

2020-08-29 22:37:59

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