All language subtitles for 7. Subnetting – Subnet Mask

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,520 --> 00:00:07,690 So a network masks helps you know which portion of the address identifies a network and which portion 2 00:00:07,690 --> 00:00:09,400 of the address identifies the node. 3 00:00:11,190 --> 00:00:18,810 An IPv4 subnet mask consists of 32 bits, a sequence of one followed by a block of zero. 4 00:00:20,190 --> 00:00:25,230 The trailing block of zeros designates that part as being the host identifier. 5 00:00:26,860 --> 00:00:35,020 Class A, B and C networks have default masks, also known as natural masks, and these masks are. 6 00:00:36,370 --> 00:00:48,640 Two five five zero zero zero for class class-A, 255.255.255.0 got zero for Class B and 255.255.255.0 7 00:00:48,640 --> 00:00:50,050 for Class C networks. 8 00:00:51,760 --> 00:00:55,660 So an IP address to a Class B network that has not been subnet. 9 00:00:56,410 --> 00:01:07,540 We'd have an address mask pair similar to one three one one zero 7.1.2 being the address and 255.255.255.0 10 00:01:07,750 --> 00:01:10,750 zero would be the subnet mask, right? 11 00:01:11,970 --> 00:01:18,450 Now, in order to see how the mask helps you identify the network and node parts of the address, convert 12 00:01:18,450 --> 00:01:22,980 the address and mask into binary numbers as seen on the slide. 13 00:01:25,730 --> 00:01:29,480 So once you have the address in the mask represented in binary. 14 00:01:30,530 --> 00:01:35,210 Then identification of the network and the host ID is a lot easier. 15 00:01:36,410 --> 00:01:42,650 Any address bits which have corresponding mask bits set to one represent the network I'd. 16 00:01:43,830 --> 00:01:49,620 And he addressed bits that have corresponding mask bits set to zero represent the host I.D.. 17 00:01:51,020 --> 00:01:56,360 So in this example, the first part, one three one eight one zero seven is the network part of the 18 00:01:56,360 --> 00:02:01,220 IP address, where the rest 1.2 represents the host. 19 00:02:03,700 --> 00:02:09,430 All devices on this segment share the same network ID and the same subnet mask. 20 00:02:10,920 --> 00:02:16,680 Now you can customize the subnet mask to divide a network into many smaller portions. 21 00:02:18,170 --> 00:02:20,300 So here's a little brain Tingler for you. 22 00:02:21,170 --> 00:02:30,290 The Network ID may be expressed in classless inter domain routing or sidr notation written as the first 23 00:02:30,290 --> 00:02:37,730 address of a network followed by a slash character and ending with a bit length of the prefix. 24 00:02:39,060 --> 00:02:46,830 So in our example, one three one one zero seven eight zero zero one six is the prefix of the IPV four 25 00:02:46,830 --> 00:02:54,060 network, starting at the given address, having 16 bits allocated for the network prefix and the remaining 26 00:02:54,060 --> 00:02:56,730 16 bits reserved for host addressing. 2995

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