1 00:00:06,900 --> 00:00:07,740 - [Instructor] Let's talk briefly 2 00:00:07,740 --> 00:00:10,110 about connectivity problems. 3 00:00:10,110 --> 00:00:12,270 Here we have a little map of computers 4 00:00:12,270 --> 00:00:13,860 and wireless access points. 5 00:00:13,860 --> 00:00:17,293 We have desktop systems, laptops, mobile devices 6 00:00:17,293 --> 00:00:21,795 and two wireless access points that also act as switches. 7 00:00:21,795 --> 00:00:23,970 The whole thing about connectivity 8 00:00:23,970 --> 00:00:26,940 is you need to be within range 9 00:00:26,940 --> 00:00:29,520 and you need to be running the same protocol 10 00:00:29,520 --> 00:00:31,530 and you don't want to have interference. 11 00:00:31,530 --> 00:00:33,030 So you wanna think about that 12 00:00:33,030 --> 00:00:35,760 whenever you're dealing with wireless networks. 13 00:00:35,760 --> 00:00:38,400 Here is the icon for mobile devices 14 00:00:38,400 --> 00:00:40,620 that shows wifi connectivity. 15 00:00:40,620 --> 00:00:44,220 In fact with full bars, this is what we want. 16 00:00:44,220 --> 00:00:48,930 And this is an icon on say a Windows eight laptop 17 00:00:48,930 --> 00:00:51,750 that shows that there is not wireless connectivity. 18 00:00:51,750 --> 00:00:55,950 You have that X on there, this is what we don't want. 19 00:00:55,950 --> 00:01:00,240 So no connectivity such as this, 20 00:01:00,240 --> 00:01:02,160 when you get an icon like this, 21 00:01:02,160 --> 00:01:04,380 it could be caused by several things. 22 00:01:04,380 --> 00:01:06,035 And one of the primary things is 23 00:01:06,035 --> 00:01:09,690 the wireless access point is not accessible. 24 00:01:09,690 --> 00:01:13,413 It's either not broadcast or it's not turned on. 25 00:01:14,280 --> 00:01:17,220 And you also want to check 26 00:01:17,220 --> 00:01:20,310 if the wireless is turned on on the device. 27 00:01:20,310 --> 00:01:22,170 Now this could be done in a variety of ways. 28 00:01:22,170 --> 00:01:25,390 If you have a mobile device like a smartphone or a tablet, 29 00:01:25,390 --> 00:01:30,384 then you can tap the wireless button to turn it on. 30 00:01:30,384 --> 00:01:31,740 And then you wanna make sure 31 00:01:31,740 --> 00:01:35,340 you scan for the correct networks and connect. 32 00:01:35,340 --> 00:01:39,480 On a laptop you'll often have a function button 33 00:01:39,480 --> 00:01:41,643 that can turn wireless on and off, 34 00:01:42,840 --> 00:01:46,380 and then on the laptop and on the desktop, 35 00:01:46,380 --> 00:01:49,830 you can click on the wireless link 36 00:01:49,830 --> 00:01:51,930 to bring up that wireless bar 37 00:01:51,930 --> 00:01:53,760 and actually scan through everything 38 00:01:53,760 --> 00:01:56,730 or go to your network and sharing center 39 00:01:56,730 --> 00:01:59,160 and try to make your connection. 40 00:01:59,160 --> 00:02:02,970 You can also enable and disable wireless from there 41 00:02:02,970 --> 00:02:07,170 and you can also enable and disable the wireless adapter 42 00:02:07,170 --> 00:02:08,790 from the device manager. 43 00:02:08,790 --> 00:02:11,520 So these are all things that you want to check. 44 00:02:11,520 --> 00:02:13,260 And you might have third party software 45 00:02:13,260 --> 00:02:14,910 that controls your wireless connection, 46 00:02:14,910 --> 00:02:18,180 where you can turn the wireless on and off. 47 00:02:18,180 --> 00:02:20,520 So for no connectivity you wanna make sure 48 00:02:20,520 --> 00:02:24,360 the wireless access point is on and broadcasting 49 00:02:24,360 --> 00:02:25,918 and within range 50 00:02:25,918 --> 00:02:28,380 and make sure that your mobile device or computer 51 00:02:28,380 --> 00:02:32,024 is on broadcasting and everything's enabled 52 00:02:32,024 --> 00:02:33,843 and also within range. 53 00:02:35,526 --> 00:02:39,660 It gets a little bit more difficult to troubleshoot 54 00:02:39,660 --> 00:02:42,540 when you get into limited connectivity. 55 00:02:42,540 --> 00:02:45,720 Limited connectivity could mean a couple things. 56 00:02:45,720 --> 00:02:47,949 One, it could mean that you have 57 00:02:47,949 --> 00:02:51,758 only X amount of data transfer per second, 58 00:02:51,758 --> 00:02:54,240 you know say instead of connecting at 59 00:02:54,240 --> 00:02:56,550 300 megabits per second, 60 00:02:56,550 --> 00:02:59,580 you can only connect at 50 megabits per second. 61 00:02:59,580 --> 00:03:01,710 And that could be caused by a couple things. 62 00:03:01,710 --> 00:03:04,530 That could be caused by the wireless access point, 63 00:03:04,530 --> 00:03:06,600 throttling down the connection 64 00:03:06,600 --> 00:03:08,853 and capping you at a certain speed. 65 00:03:09,899 --> 00:03:13,246 It could also be caused by the distance 66 00:03:13,246 --> 00:03:16,233 of the wireless access point from the device. 67 00:03:17,430 --> 00:03:20,610 It could also be a problem with the protocol used. 68 00:03:20,610 --> 00:03:25,122 You may want connect your laptop via 802.11 AC 69 00:03:25,122 --> 00:03:28,920 but this wireless access point is only broadcasting 70 00:03:28,920 --> 00:03:33,270 on 802.11 G and you make that connection 71 00:03:33,270 --> 00:03:36,409 and then you're only limited to 54 megabits per second. 72 00:03:36,409 --> 00:03:38,100 So there's a lot of possibilities 73 00:03:38,100 --> 00:03:40,740 with limited connectivity as well. 74 00:03:40,740 --> 00:03:45,210 So the best thing to do is to check the protocol 75 00:03:45,210 --> 00:03:47,492 make sure that you have the correct protocol 76 00:03:47,492 --> 00:03:49,410 running on the wireless access point 77 00:03:49,410 --> 00:03:53,229 and on the mobile device or the desktop or laptop. 78 00:03:53,229 --> 00:03:56,970 And then you can also check your antennas, 79 00:03:56,970 --> 00:03:59,400 make sure the antennas are screwed on 80 00:03:59,400 --> 00:04:03,060 and you can adjust their angle 81 00:04:03,060 --> 00:04:05,134 to try to promote the best connection 82 00:04:05,134 --> 00:04:07,443 and then check the distance as well. 83 00:04:08,790 --> 00:04:10,770 Now, another thing about limited connectivity, 84 00:04:10,770 --> 00:04:15,060 is you can have a time based limited connectivity. 85 00:04:15,060 --> 00:04:17,400 Let's say there's a policy in the company 86 00:04:17,400 --> 00:04:20,078 and this wireless access point only broadcasts 87 00:04:20,078 --> 00:04:22,470 between 9:00 AM and 5:00 PM. 88 00:04:22,470 --> 00:04:23,580 Well, you're gonna be limited 89 00:04:23,580 --> 00:04:26,250 to those hours from your computer. 90 00:04:26,250 --> 00:04:28,170 So that's something you gotta keep in mind also, 91 00:04:28,170 --> 00:04:29,730 it's a possibility that you can only 92 00:04:29,730 --> 00:04:31,560 connect at certain times. 93 00:04:31,560 --> 00:04:33,993 That's in our possible limited connectivity. 94 00:04:35,640 --> 00:04:38,370 The next one is intermittent connectivity. 95 00:04:38,370 --> 00:04:40,650 Now, when it comes to PCs, 96 00:04:40,650 --> 00:04:42,540 usually intermittent problems 97 00:04:42,540 --> 00:04:44,580 are the hardest to troubleshoot 98 00:04:44,580 --> 00:04:46,178 but with wireless networks 99 00:04:46,178 --> 00:04:49,197 intermittent problems are a little bit easier. 100 00:04:49,197 --> 00:04:51,906 If you have intermittent connectivity 101 00:04:51,906 --> 00:04:54,120 it could mean one of a couple things. 102 00:04:54,120 --> 00:04:57,030 One, your computer's distance 103 00:04:57,030 --> 00:04:59,523 from the wireless access point is too great. 104 00:05:00,786 --> 00:05:05,730 And two, there's possible interference from other devices 105 00:05:05,730 --> 00:05:08,940 or other electronic devices or microwaves 106 00:05:08,940 --> 00:05:12,060 or HVAC equipment. 107 00:05:12,060 --> 00:05:17,041 So it's really broken down into distance and interference. 108 00:05:17,041 --> 00:05:20,430 So if this computer is say way out over here 109 00:05:20,430 --> 00:05:21,750 it's gonna be a little bit too far 110 00:05:21,750 --> 00:05:24,030 to get that connection to a wireless access point. 111 00:05:24,030 --> 00:05:26,664 You know, if you have say 802.11 N 112 00:05:26,664 --> 00:05:31,664 and you have a computer that's 200, 250 feet out, 113 00:05:31,860 --> 00:05:33,600 out in a warehouse, you know 114 00:05:33,600 --> 00:05:36,030 it's gonna be difficult to get that connection. 115 00:05:36,030 --> 00:05:38,460 So you might get no connectivity 116 00:05:38,460 --> 00:05:41,280 or you might get intermittent connectivity, 117 00:05:41,280 --> 00:05:44,340 where you have a connection, but then it drops out. 118 00:05:44,340 --> 00:05:46,590 And you know, you get that complaint from people a lot. 119 00:05:46,590 --> 00:05:48,240 My connection keeps dropping out. 120 00:05:49,230 --> 00:05:51,300 And in that case, it's the distance 121 00:05:51,300 --> 00:05:53,820 but you might have a bunch of walls in between you 122 00:05:53,820 --> 00:05:57,330 and your computer and the wireless access point. 123 00:05:57,330 --> 00:05:58,770 And again, you might have that interference 124 00:05:58,770 --> 00:06:00,147 with other devices 125 00:06:00,147 --> 00:06:03,720 and electronic equipment and electrical devices. 126 00:06:03,720 --> 00:06:07,500 And that's when the interference comes into play. 127 00:06:07,500 --> 00:06:11,336 Now with both of these, with distance and interference. 128 00:06:11,336 --> 00:06:13,981 If you see intermittent connectivity 129 00:06:13,981 --> 00:06:18,728 when you do have a connection, it'll usually be pretty slow. 130 00:06:18,728 --> 00:06:22,653 So let's say you have an 802.11 AC connection, 131 00:06:23,910 --> 00:06:28,200 if that's the case and you normally are getting 132 00:06:28,200 --> 00:06:32,093 somewhere in the range of 500 megabit per second connections 133 00:06:32,093 --> 00:06:35,080 when you have this intermittent connectivity 134 00:06:35,080 --> 00:06:39,600 and you can connect, you might see connections around 135 00:06:39,600 --> 00:06:42,690 50 or a hundred megabits per second, or even lower. 136 00:06:42,690 --> 00:06:45,330 So if you see that much lower data transfer rate 137 00:06:45,330 --> 00:06:46,980 then you're accustomed to 138 00:06:46,980 --> 00:06:49,680 or what the protocol should provide 139 00:06:49,680 --> 00:06:51,209 when you do have connectivity, 140 00:06:51,209 --> 00:06:52,980 then that intermittent connectivity 141 00:06:52,980 --> 00:06:57,980 is most likely caused by distance or by interference. 142 00:06:59,610 --> 00:07:01,080 Then there's local connectivity. 143 00:07:01,080 --> 00:07:02,790 And what we mean by this 144 00:07:02,790 --> 00:07:05,610 is connectivity to the local area network 145 00:07:05,610 --> 00:07:07,624 but nothing beyond that. 146 00:07:07,624 --> 00:07:10,170 And the local connectivity to the network means 147 00:07:10,170 --> 00:07:11,820 you can connect from your desktop 148 00:07:11,820 --> 00:07:14,024 to other computers on the land 149 00:07:14,024 --> 00:07:17,308 and the wireless access point or points 150 00:07:17,308 --> 00:07:21,203 but you can't get out to internet sites to websites. 151 00:07:21,203 --> 00:07:24,090 You can't download your mail from the internet, 152 00:07:24,090 --> 00:07:25,040 that kind of thing. 153 00:07:26,340 --> 00:07:29,040 If this happens, it's generally an issue 154 00:07:29,040 --> 00:07:30,300 on one of two sides. 155 00:07:30,300 --> 00:07:35,091 One, the computers IP configuration could be wrong, 156 00:07:35,091 --> 00:07:37,800 it's gateway address could be incorrect. 157 00:07:37,800 --> 00:07:40,510 So you do your IP config slash all and check that 158 00:07:42,120 --> 00:07:45,930 or two, it could be a wireless access point issue, 159 00:07:45,930 --> 00:07:47,580 where the wireless access point 160 00:07:47,580 --> 00:07:50,790 is not connecting out to the gateway properly. 161 00:07:50,790 --> 00:07:51,870 Now, if that's the case, 162 00:07:51,870 --> 00:07:54,540 all computers would not be able to get on. 163 00:07:54,540 --> 00:07:58,740 If it's only one system that can't get onto the internet, 164 00:07:58,740 --> 00:08:02,961 then you wanna focus on that one system's IP configuration 165 00:08:02,961 --> 00:08:05,550 and that gateway address. 166 00:08:05,550 --> 00:08:07,770 Sometimes fixing the gateway address, 167 00:08:07,770 --> 00:08:11,004 you know, changing the gateway address will fix the problem. 168 00:08:11,004 --> 00:08:14,727 Sometimes you need to do an IP config, release and renew 169 00:08:14,727 --> 00:08:16,680 and sometimes you need to forget 170 00:08:16,680 --> 00:08:18,570 the networking connection altogether, 171 00:08:18,570 --> 00:08:22,961 forget that wireless connection and then reconnect to it. 172 00:08:22,961 --> 00:08:24,636 And these types of things 173 00:08:24,636 --> 00:08:27,259 can help to fix a lot of these problems, you know, 174 00:08:27,259 --> 00:08:30,471 forget the wireless network and reconnect, 175 00:08:30,471 --> 00:08:34,890 power cycle the equipment, check if the wireless adapter 176 00:08:34,890 --> 00:08:37,440 is enabled in Windows in the device manager 177 00:08:37,440 --> 00:08:39,150 or in the network and sharing center, 178 00:08:39,150 --> 00:08:41,100 or in the third party software, 179 00:08:41,100 --> 00:08:44,400 or press the button the function key on the laptop, 180 00:08:44,400 --> 00:08:48,630 check the wireless software within the mobile device. 181 00:08:48,630 --> 00:08:52,200 And another thing with all of these as well is the antennas. 182 00:08:52,200 --> 00:08:54,540 Of course, you gotta make sure that the antennas are 183 00:08:54,540 --> 00:08:58,080 connected, their screwed on and they're adjusted properly. 184 00:08:58,080 --> 00:09:00,390 Normally I'll adjust these at a 90 degree angle 185 00:09:00,390 --> 00:09:01,800 have one pointing out straight 186 00:09:01,800 --> 00:09:03,930 and then one at a 45 to that, 187 00:09:03,930 --> 00:09:06,240 and one at a 45 degree angle to that guy. 188 00:09:06,240 --> 00:09:08,460 And the same thing on the clients. 189 00:09:08,460 --> 00:09:13,113 Now you can't do much about that with the mobile devices, 190 00:09:14,070 --> 00:09:16,860 but with the PC, you definitely can 191 00:09:16,860 --> 00:09:19,440 cuz that has the external antennas. 192 00:09:19,440 --> 00:09:22,113 So you can adjust those for best connectivity. 193 00:09:23,100 --> 00:09:25,809 So there's some things to look at with connectivity problems 194 00:09:25,809 --> 00:09:27,759 and that's about it for the sub lesson.