WEBVTT

1
00:00:00.080 --> 00:00:03.319
<v Speaker 1>Ready to dive into the world of networking. Today, we're

2
00:00:03.359 --> 00:00:07.559
<v Speaker 1>tackling Mike Myers Comtia Network Plus Guide to Managing and

3
00:00:07.599 --> 00:00:09.759
<v Speaker 1>Troubleshooting Networks, sixth edition.

4
00:00:09.960 --> 00:00:11.960
<v Speaker 2>Oh a classic and for good reason.

5
00:00:12.080 --> 00:00:14.160
<v Speaker 1>It really is. And you know what makes it even better,

6
00:00:14.439 --> 00:00:19.120
<v Speaker 1>the author, Jonathan S. Weisman, talk about a legend forty

7
00:00:19.120 --> 00:00:20.320
<v Speaker 1>four certifications.

8
00:00:20.359 --> 00:00:22.359
<v Speaker 2>Wow, forty four that's impressive.

9
00:00:22.559 --> 00:00:27.120
<v Speaker 1>Right, We're talking Cisco's CCMP Enterprise, Comtia Network Plus, Ya,

10
00:00:27.280 --> 00:00:27.839
<v Speaker 1>you name it.

11
00:00:27.879 --> 00:00:30.120
<v Speaker 2>He's even in the IPv six Forms Hall of Fame.

12
00:00:30.120 --> 00:00:30.920
<v Speaker 2>That's how good he is.

13
00:00:31.120 --> 00:00:33.000
<v Speaker 1>Exactly, so you know this book is the real deal.

14
00:00:33.479 --> 00:00:36.920
<v Speaker 1>Imagine this, You've just finished your IT training and land

15
00:00:36.960 --> 00:00:41.119
<v Speaker 1>a job as a desktop support specialist nice at JSW,

16
00:00:41.320 --> 00:00:43.280
<v Speaker 1>a mid size IT consulting firm.

17
00:00:43.399 --> 00:00:45.679
<v Speaker 2>Great place to get your hands dirty with all sorts

18
00:00:45.719 --> 00:00:47.719
<v Speaker 2>of network setups. You'd learn a lot there.

19
00:00:47.719 --> 00:00:52.079
<v Speaker 1>For sure, diverse clients, real world problems, you'd experience it all, and.

20
00:00:52.039 --> 00:00:55.119
<v Speaker 2>We're better to start than with the OSI model. Sounds scary,

21
00:00:55.200 --> 00:00:57.479
<v Speaker 2>but it's just a roadmap for how networks talk to

22
00:00:57.520 --> 00:00:57.920
<v Speaker 2>each other.

23
00:00:57.960 --> 00:01:00.399
<v Speaker 1>It's like sending letter. Actually, each layer of the OSI

24
00:01:00.560 --> 00:01:02.799
<v Speaker 1>model is like a step in the postal system.

25
00:01:02.840 --> 00:01:04.159
<v Speaker 2>Okay, I see where you're going with this.

26
00:01:04.400 --> 00:01:06.920
<v Speaker 1>So you write the letter. That's the application layer, like

27
00:01:06.959 --> 00:01:09.000
<v Speaker 1>your email, you format it and put it in an

28
00:01:09.079 --> 00:01:11.319
<v Speaker 1>envelope that is like the presentation layer, and so on

29
00:01:11.680 --> 00:01:14.159
<v Speaker 1>until the physical layer, where those bits are actually flying

30
00:01:14.159 --> 00:01:17.159
<v Speaker 1>across the wires, just like your mail carrier driving to

31
00:01:17.200 --> 00:01:17.840
<v Speaker 1>the destination.

32
00:01:18.239 --> 00:01:21.159
<v Speaker 2>And the book gives some good real world examples for

33
00:01:21.200 --> 00:01:24.519
<v Speaker 2>each layer, like m mass addresses. Those are on the

34
00:01:24.640 --> 00:01:27.799
<v Speaker 2>data link layer. They're like return addresses for your devices.

35
00:01:27.840 --> 00:01:29.480
<v Speaker 1>Oh, that's a good way to put it. And then

36
00:01:29.519 --> 00:01:32.040
<v Speaker 1>there's the network layer with the IP addresses, right, those

37
00:01:32.040 --> 00:01:32.879
<v Speaker 1>are essential.

38
00:01:32.640 --> 00:01:35.120
<v Speaker 2>Absolutely, like the street address for your data packets.

39
00:01:35.359 --> 00:01:37.439
<v Speaker 1>So everything works together to make sure that data gets

40
00:01:37.480 --> 00:01:40.200
<v Speaker 1>where it needs to go precisely. Speaking of the Internet,

41
00:01:40.400 --> 00:01:44.840
<v Speaker 1>the book mentions a documentary NERDS two point zero point one,

42
00:01:45.599 --> 00:01:47.079
<v Speaker 1>a Brief History of the Internet.

43
00:01:47.120 --> 00:01:48.680
<v Speaker 2>Oh yeah, I think I've heard of that one from

44
00:01:48.680 --> 00:01:49.640
<v Speaker 2>the nineties.

45
00:01:49.319 --> 00:01:51.840
<v Speaker 1>Right, nineteen ninety eight to be exact. You can find

46
00:01:51.879 --> 00:01:52.879
<v Speaker 1>it on the Internet Archive.

47
00:01:53.040 --> 00:01:54.760
<v Speaker 2>Nice, might have to check that out.

48
00:01:54.760 --> 00:01:56.560
<v Speaker 1>It's supposed to be a fascinating look at the early

49
00:01:56.640 --> 00:01:57.280
<v Speaker 1>days of the Internet.

50
00:01:57.439 --> 00:01:58.319
<v Speaker 2>Definitely worth a watch.

51
00:01:58.359 --> 00:02:01.920
<v Speaker 1>Then now let's talk speed Ethernet speed.

52
00:02:02.319 --> 00:02:05.040
<v Speaker 2>It's gone crazy fast, right, it's mind blowing. We've gone

53
00:02:05.079 --> 00:02:08.680
<v Speaker 2>from ten melvps to eight hundred gbps. It's incredible.

54
00:02:08.759 --> 00:02:10.520
<v Speaker 1>Yeah, and they're even talking about a one point six

55
00:02:10.560 --> 00:02:11.800
<v Speaker 1>tvps standard soon.

56
00:02:12.000 --> 00:02:15.759
<v Speaker 2>It's insane. But for now, let's stick with what's common.

57
00:02:16.199 --> 00:02:19.520
<v Speaker 2>Gigabit ethernet. That's what you're likely to be working with.

58
00:02:19.960 --> 00:02:22.000
<v Speaker 1>Right. Let's say you need to design a network for

59
00:02:22.039 --> 00:02:25.560
<v Speaker 1>a new office building. Gigabit ethernet is the way to go.

60
00:02:26.199 --> 00:02:28.080
<v Speaker 1>But it's not as straightforward as it sounds.

61
00:02:28.159 --> 00:02:31.639
<v Speaker 2>No, not at all. You've got options, different tips of

62
00:02:31.680 --> 00:02:35.159
<v Speaker 2>gigabit ethernet, each with its own use case. Like what, well,

63
00:02:35.159 --> 00:02:38.240
<v Speaker 2>there's a thousand base T your standard copper cable setup,

64
00:02:38.439 --> 00:02:39.560
<v Speaker 2>good for most offices.

65
00:02:39.639 --> 00:02:40.400
<v Speaker 1>Okay, it makes sense.

66
00:02:40.439 --> 00:02:42.479
<v Speaker 2>Then you've got a thousand base LX that's your long

67
00:02:42.520 --> 00:02:46.479
<v Speaker 2>distance runner fiber optic cables, perfect for connecting buildings across

68
00:02:46.479 --> 00:02:47.000
<v Speaker 2>a campus.

69
00:02:47.400 --> 00:02:49.400
<v Speaker 1>So fiber for longer distances.

70
00:02:49.120 --> 00:02:52.840
<v Speaker 2>Exactly, and for shorter distances often used in data centers,

71
00:02:52.879 --> 00:02:56.039
<v Speaker 2>there's one thousand base SX also fiber.

72
00:02:56.240 --> 00:02:58.639
<v Speaker 1>Got it. So it's about choosing the right tool for

73
00:02:58.680 --> 00:03:00.039
<v Speaker 1>the job basically.

74
00:02:59.680 --> 00:03:04.560
<v Speaker 2>Exactly distance, number of devices budget for those network interface

75
00:03:04.639 --> 00:03:07.280
<v Speaker 2>cards and ICs. Yeah, they're what let your computers connect

76
00:03:07.319 --> 00:03:07.840
<v Speaker 2>to the network.

77
00:03:08.000 --> 00:03:11.000
<v Speaker 1>Right, of course, so many factors to consider. It's like a.

78
00:03:11.000 --> 00:03:13.840
<v Speaker 2>Puzzle, it is, and that's part of what makes networking

79
00:03:13.879 --> 00:03:17.000
<v Speaker 2>so interesting. But let's move on to the glue that

80
00:03:17.080 --> 00:03:21.240
<v Speaker 2>holds it all together. The TCPIP protocol suite.

81
00:03:21.159 --> 00:03:24.039
<v Speaker 1>The language of the Internet. Right. It's been around forever,

82
00:03:24.080 --> 00:03:26.360
<v Speaker 1>it seems. Why is it still so important?

83
00:03:26.840 --> 00:03:31.199
<v Speaker 2>Because it's what makes the Internet work. Email streaming, everything

84
00:03:31.240 --> 00:03:33.280
<v Speaker 2>online relies on TCPIP.

85
00:03:33.599 --> 00:03:35.319
<v Speaker 1>Wow, I hadn't thought of it that way.

86
00:03:35.400 --> 00:03:38.800
<v Speaker 2>And at the heart of it all IP addresses your

87
00:03:38.879 --> 00:03:40.800
<v Speaker 2>data's home address, like.

88
00:03:40.759 --> 00:03:43.400
<v Speaker 1>How the postal service needs an address to deliver mail,

89
00:03:43.800 --> 00:03:45.000
<v Speaker 1>makes sense exactly.

90
00:03:45.159 --> 00:03:48.639
<v Speaker 2>And understanding these addresses, how they're structured, the different classes

91
00:03:48.960 --> 00:03:50.759
<v Speaker 2>and subnetting that's key.

92
00:03:51.039 --> 00:03:53.159
<v Speaker 1>Subnetting that sounds a little intimidating.

93
00:03:53.240 --> 00:03:54.960
<v Speaker 2>It's not as bad as it sounds. Think of it

94
00:03:55.000 --> 00:03:56.800
<v Speaker 2>like this. You've got a big office building and you

95
00:03:56.879 --> 00:03:59.360
<v Speaker 2>need to divide it into departments, each with its own

96
00:03:59.400 --> 00:04:02.560
<v Speaker 2>set of office numbers. Subnetting's kind of like that. You're

97
00:04:02.599 --> 00:04:05.840
<v Speaker 2>taking a network and dividing it into smaller subnetworks, each

98
00:04:05.879 --> 00:04:07.520
<v Speaker 2>with its own IP address range.

99
00:04:07.560 --> 00:04:09.439
<v Speaker 1>So it's about managing those addresses more.

100
00:04:09.319 --> 00:04:13.319
<v Speaker 2>Efficiently, exactly. And to make things even more efficient, we

101
00:04:13.439 --> 00:04:15.159
<v Speaker 2>have private IP addresses.

102
00:04:15.199 --> 00:04:16.120
<v Speaker 1>Private IP addresses.

103
00:04:16.319 --> 00:04:18.560
<v Speaker 2>Yeah, it's like having a separate set of addresses you

104
00:04:18.720 --> 00:04:21.240
<v Speaker 2>use inside your home, but you still have a public

105
00:04:21.240 --> 00:04:24.360
<v Speaker 2>address for mail. It's all about conserving those public IP

106
00:04:24.439 --> 00:04:27.480
<v Speaker 2>addresses that everyone shares. Those are defined in a document

107
00:04:27.519 --> 00:04:30.120
<v Speaker 2>called RFC nineteen eighteen, by the way, if you want

108
00:04:30.160 --> 00:04:30.680
<v Speaker 2>to look it up.

109
00:04:30.879 --> 00:04:33.639
<v Speaker 1>Interesting. So it's like an internal address system exactly.

110
00:04:33.759 --> 00:04:34.879
<v Speaker 2>Pretty clever, right.

111
00:04:34.800 --> 00:04:37.600
<v Speaker 1>Okay, so we've got these sub networks. They're all organized,

112
00:04:38.160 --> 00:04:41.920
<v Speaker 1>but how do we actually see what's happening on them.

113
00:04:41.920 --> 00:04:43.560
<v Speaker 1>It's like a highway system. You need a way to

114
00:04:43.560 --> 00:04:44.319
<v Speaker 1>monitor the traffic.

115
00:04:44.399 --> 00:04:47.439
<v Speaker 2>Right, you're spot on, and that's where packet sniffing comes in.

116
00:04:47.839 --> 00:04:50.439
<v Speaker 1>Packet sniffing sounds kind of sneaky.

117
00:04:50.639 --> 00:04:52.600
<v Speaker 2>It is a little bit like listening in on the

118
00:04:52.600 --> 00:04:56.279
<v Speaker 2>conversations your network devices are having. But it's not about gossip.

119
00:04:56.319 --> 00:04:59.439
<v Speaker 2>It's about data. You're seeing how your network is performing.

120
00:05:00.000 --> 00:05:03.439
<v Speaker 1>I'm listening. Tell me more about how this packet sniffing works.

121
00:05:03.720 --> 00:05:06.399
<v Speaker 2>So imagine a device that can see all the data

122
00:05:06.399 --> 00:05:09.959
<v Speaker 2>packets flowing through a specific point on your network. You

123
00:05:10.000 --> 00:05:13.319
<v Speaker 2>see where they're coming from, where they're going, even what's inside.

124
00:05:13.839 --> 00:05:14.879
<v Speaker 2>That's packet sniffing.

125
00:05:15.000 --> 00:05:17.560
<v Speaker 1>Wow, that's pretty powerful. Yeah, so what do you use

126
00:05:17.680 --> 00:05:18.439
<v Speaker 1>like a special tool.

127
00:05:18.639 --> 00:05:21.519
<v Speaker 2>There's a great tool called wire shark. It's open source,

128
00:05:21.639 --> 00:05:24.800
<v Speaker 2>so it's free, and it's like the Swiss Army Knife

129
00:05:24.800 --> 00:05:25.959
<v Speaker 2>of network analysis.

130
00:05:26.439 --> 00:05:28.920
<v Speaker 1>Super versatile, Free is always good. So what can you

131
00:05:29.000 --> 00:05:29.959
<v Speaker 1>actually do with it?

132
00:05:30.079 --> 00:05:36.040
<v Speaker 2>Just about anything, troubleshooting problems, analyzing traffic, even detecting security threats.

133
00:05:36.120 --> 00:05:38.839
<v Speaker 1>It's like having x ray vision into your network exactly,

134
00:05:39.000 --> 00:05:40.680
<v Speaker 1>so we can see what's happening. But what about the

135
00:05:40.680 --> 00:05:44.199
<v Speaker 1>protocols that make it all work? The book mentions ARP

136
00:05:44.399 --> 00:05:46.319
<v Speaker 1>and ICMP. What are those all about?

137
00:05:47.079 --> 00:05:49.680
<v Speaker 2>Those are the unsung heroes working behind the scenes.

138
00:05:50.199 --> 00:05:50.399
<v Speaker 1>ARP.

139
00:05:50.800 --> 00:05:53.959
<v Speaker 2>That's Address Resolution Protocol. It's like a directory service for

140
00:05:54.000 --> 00:05:54.759
<v Speaker 2>your network.

141
00:05:54.519 --> 00:05:55.759
<v Speaker 1>Like a phone book for devices.

142
00:05:55.839 --> 00:05:58.839
<v Speaker 2>Exactly. Every device has an IP address, right, but also

143
00:05:58.879 --> 00:06:01.480
<v Speaker 2>has a physical address m mass address tied to its

144
00:06:01.519 --> 00:06:05.279
<v Speaker 2>network card. ARP helps devices find each other's MC addresses

145
00:06:05.319 --> 00:06:07.279
<v Speaker 2>when they only know the IP ah.

146
00:06:07.279 --> 00:06:10.360
<v Speaker 1>So if my computer wants to send data to another computer,

147
00:06:10.879 --> 00:06:13.959
<v Speaker 1>it uses ARP to look up the m healz address.

148
00:06:14.000 --> 00:06:16.000
<v Speaker 1>That's clever and ICMP.

149
00:06:16.680 --> 00:06:20.319
<v Speaker 2>ICMP is the Internet Control Message Protocol. It's how devices

150
00:06:20.399 --> 00:06:22.879
<v Speaker 2>send control messages and error messages to each other.

151
00:06:23.199 --> 00:06:26.199
<v Speaker 1>So like, if there's a problem, ICMP raises the flag.

152
00:06:26.279 --> 00:06:26.759
<v Speaker 1>You got it?

153
00:06:26.959 --> 00:06:30.680
<v Speaker 2>Ever, use the ping command. That's ICMP in action. It

154
00:06:30.800 --> 00:06:33.720
<v Speaker 2>uses ICMP echo requests to see if a device is

155
00:06:33.759 --> 00:06:34.720
<v Speaker 2>responding ping.

156
00:06:35.000 --> 00:06:36.800
<v Speaker 1>Right. I use that all the time. It's good to

157
00:06:36.800 --> 00:06:39.279
<v Speaker 1>know what's actually happening under the hood. Speaking of things

158
00:06:39.319 --> 00:06:41.959
<v Speaker 1>I use all the time, Thank goodness for DNS. Imagine

159
00:06:41.959 --> 00:06:44.800
<v Speaker 1>having to remember those long, complicated IP addresses.

160
00:06:44.839 --> 00:06:47.639
<v Speaker 2>It would be a nightmare. That's where DNS comes in

161
00:06:47.680 --> 00:06:51.279
<v Speaker 2>the Domain Name system. It's the Internet's phone book, translating

162
00:06:51.319 --> 00:06:54.360
<v Speaker 2>those IP addresses into nice, easy to remote domain names.

163
00:06:54.439 --> 00:06:57.240
<v Speaker 1>So when I type in say Google dot com, DNS

164
00:06:57.319 --> 00:06:59.600
<v Speaker 1>is what finds the actual IP address exactly.

165
00:07:00.079 --> 00:07:02.680
<v Speaker 2>Computer sends a request to a DNS server, The server

166
00:07:02.759 --> 00:07:04.920
<v Speaker 2>looks up the IP address for that domain name, sends

167
00:07:04.920 --> 00:07:06.839
<v Speaker 2>it back to your computer, and boom, you're on Google.

168
00:07:07.000 --> 00:07:08.720
<v Speaker 2>The book actually shows you how to set up a

169
00:07:08.720 --> 00:07:09.800
<v Speaker 2>basic DNS server.

170
00:07:09.680 --> 00:07:12.079
<v Speaker 1>Yourself, no way, your own little corner of the Internet.

171
00:07:12.240 --> 00:07:14.680
<v Speaker 1>That's really neat. But okay, we've talked a lot about

172
00:07:14.680 --> 00:07:17.120
<v Speaker 1>how networks work, But what about security? How do we

173
00:07:17.160 --> 00:07:18.879
<v Speaker 1>actually keep all this data safe?

174
00:07:19.000 --> 00:07:22.600
<v Speaker 2>That's the million dollar question these days. One thing's for sure.

175
00:07:22.680 --> 00:07:24.199
<v Speaker 2>Passwords alone aren't.

176
00:07:23.920 --> 00:07:27.279
<v Speaker 1>Cutting it, definitely not. You hear about data breaches all

177
00:07:27.279 --> 00:07:29.480
<v Speaker 1>the time. So what's the next level up?

178
00:07:30.040 --> 00:07:35.160
<v Speaker 2>Multi factor authentication MFA. It's like a second lock on

179
00:07:35.199 --> 00:07:37.800
<v Speaker 2>your door. You need your password and something else, like

180
00:07:37.839 --> 00:07:39.959
<v Speaker 2>a code from your phone or a security token.

181
00:07:40.240 --> 00:07:43.079
<v Speaker 1>So even if someone gets your password, they still can't

182
00:07:43.120 --> 00:07:45.600
<v Speaker 1>get in without that extra factor exactly.

183
00:07:45.639 --> 00:07:48.720
<v Speaker 2>It's a simple but effective way to really boost security.

184
00:07:48.920 --> 00:07:51.279
<v Speaker 1>Makes sense. So we've covered a lot of ground here.

185
00:07:51.319 --> 00:07:56.639
<v Speaker 1>The osimodel ethernet IP addresses subnetting security. We even dipped

186
00:07:56.639 --> 00:08:00.319
<v Speaker 1>our toes into virtualization and cloud computing. That's a lot.

187
00:08:00.480 --> 00:08:02.279
<v Speaker 2>It's a lot to take in, for sure, But the

188
00:08:02.360 --> 00:08:05.199
<v Speaker 2>key takeaway is that networking is the backbone of well

189
00:08:05.240 --> 00:08:06.399
<v Speaker 2>pretty much everything these.

190
00:08:06.319 --> 00:08:08.680
<v Speaker 1>Days, and like any backbone, it's made up of all

191
00:08:08.680 --> 00:08:12.160
<v Speaker 1>these interconnected parts, each with its own important job.

192
00:08:12.319 --> 00:08:14.439
<v Speaker 2>And the cool thing is it's always evolving.

193
00:08:14.720 --> 00:08:17.319
<v Speaker 1>That's true, there's always something new to learn in the

194
00:08:17.360 --> 00:08:18.199
<v Speaker 1>world of networking.

195
00:08:18.399 --> 00:08:21.240
<v Speaker 2>This deep dive was really just the beginning. We've given

196
00:08:21.240 --> 00:08:24.360
<v Speaker 2>you a foundation but there's a whole universe of knowledge

197
00:08:24.360 --> 00:08:25.360
<v Speaker 2>out there to explore.

198
00:08:25.600 --> 00:08:28.199
<v Speaker 1>The book has a ton of hands on labs that's

199
00:08:28.199 --> 00:08:31.399
<v Speaker 1>a great way to really solidify what you've learned.

200
00:08:31.519 --> 00:08:34.799
<v Speaker 2>Absolutely think of it like a networking playground, safe to

201
00:08:34.919 --> 00:08:37.039
<v Speaker 2>experiment and try things out exactly.

202
00:08:37.200 --> 00:08:40.159
<v Speaker 1>And don't forget all those online resources we mentioned. There's

203
00:08:40.200 --> 00:08:41.679
<v Speaker 1>so much information available.

204
00:08:41.879 --> 00:08:44.720
<v Speaker 2>It's all about staying curious and never stop learning.

205
00:08:45.000 --> 00:08:48.080
<v Speaker 1>Well said, So for all you listeners out there, consider

206
00:08:48.120 --> 00:08:51.840
<v Speaker 1>this your official invitation to the exciting world of networking.

207
00:08:51.919 --> 00:08:54.559
<v Speaker 2>Whether you're just starting out or you're a season pro,

208
00:08:54.919 --> 00:08:56.840
<v Speaker 2>there's always something new to discover.

209
00:08:57.120 --> 00:09:00.600
<v Speaker 1>And with that, until next time, happy networking,