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25 Cards in this Set
- Front
- Back
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Subnet Mask |
A 32-bit value that allows the device that's receiving IP packets to distinguish the network ID portion of the IP address from the host ID portion of the IP address. |
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2^1, 2^2, 2^3, 2^4, 2^5, 2^6, 2^7, 2^8, 2^9, 2^10, 2^11, 2^12, 2^13, 2^14 |
2^1 = 2 2^2 = 4 2^3 = 8 2^4 = 16 2^5 = 32 2^6 = 64 2^7 = 128 2^8 = 256 2^9 = 512 2^10 = 1,024 2^11 = 2,048 2^12 = 4,096 2^13 = 8,192 2^14 = 16,384 |
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The method ISPs use to allocate a number of addresses to a company, a home/their customers. |
Classless Inter-Domain Routing (CIDR) |
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CIDR Values |
/8 255.0.0.0 /9 255.128.0.0 /10 255.192.0.0 /11 255.224.0.0 /12 255.240.0.0 (like a /28) /13 255.248.0.0 /14 255.252.0.0 (like a /30) /15 255.254.0.0 /16 255.255.0.0 /17 255.255.128.0 /18 255.255.192.0 /19 255.255.224.0 /20 255.255.240.0 (like a /28) /21 255.255.248.0 /22 255.255.252.0 (like a /30) /23 255.255.254.0 /24 255.255.255.0 /25 255.255.255.128 /26 255.255.255.192 /27 255.255.255.224 /28 255.255.255.240 /29 255.255.255.248 /30 255.255.255.252 |
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/8 to /15 /16 to /23 /24 to /30 |
/8 to /15: Class A /16 to /23: Class A & B /24 to /30: Class A, B, & C
Most companies use Class A. 255.0.0.0 (lots of hosts) |
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IP subnet-zero command |
Command allows you to use the first and last subnet in your network design.
Provides two more subnets for every subnet mask you use. |
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How many subnets? |
2^x where 'x' is number of masked bits (1s)
11000000 = 2^2 = 4 subnets |
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How many hosts per subnet? |
2^y-2 where 'y' is number of unmasked bits (0s)
11000000 = 2^6 - 2 = 64-2=62 hosts PER subnet |
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What are the number of valid subnets? |
256 - subnet mask = block size
255.255.255.192 256-192 = 64 The block size of a 192 mask is always 64.
0, 64, 128, 192 |
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What is the broadcast address for each subnet? |
Broadcast address is always the number right before the next subnet.
Subnets = 0, 64, 128, 192 Broadcasts = 63, 127, 191
LAST SUBNET BROADCAST IS ALWAYS 255 |
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What are the valid hosts? |
The Numbers between the subnets omitting the all-0s and all 1s.
Subnet 64, broadcast 127 Valid host range: 65-126 |
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What are the valid hosts? |
The Numbers between the subnets omitting the all-0s and all 1s.
Subnet 64, broadcast 127 Valid host range: 65-126 |
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'C' in router output translates to |
Directly connected network |
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/25 |
255.255.255.128 (10000000) 1 bit on 7 bits off Block size of 128 Subnets 0 and 128 2 subnets, 126 hosts each |
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/26 |
255.255.255.192 (11000000) 2 bits on 6 bits off Block size 64 Subnets 0, 64, 128, 192 4 subnets, 62 hosts each |
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/26 |
255.255.255.192 (11000000) 2 bits on 6 bits off Block size 64 Subnets 0, 64, 128, 192 4 subnets, 62 hosts each |
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/27 |
255.255.255.224 (11100000) 3 bits on 5 bits off Block size of 32 Subnets 0, 32, 64, 96, 128, 160, 192, 224 8 subnets 30 hosts each |
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/26 |
255.255.255.192 (11000000) 2 bits on 6 bits off Block size 64 Subnets 0, 64, 128, 192 4 subnets, 62 hosts each |
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/27 |
255.255.255.224 (11100000) 3 bits on 5 bits off Block size of 32 Subnets 0, 32, 64, 96, 128, 160, 192, 224 8 subnets 30 hosts each |
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/28 |
255.255.255.240 (11110000) 4 bits on 4 bits off Block size of 16 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240 16 subnets 14 hosts each |
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/26 |
255.255.255.192 (11000000) 2 bits on 6 bits off Block size 64 Subnets 0, 64, 128, 192 4 subnets, 62 hosts each |
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/27 |
255.255.255.224 (11100000) 3 bits on 5 bits off Block size of 32 Subnets 0, 32, 64, 96, 128, 160, 192, 224 8 subnets 30 hosts each |
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/28 |
255.255.255.240 (11110000) 4 bits on 4 bits off Block size of 16 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240 16 subnets 14 hosts each |
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/29 |
255.255.255.248 (11111000) 5 bits on 3 bits off Block size of 8 Remember: 56, 72, 88, 104, 120, 136, 152, 168, 176, 184, 200 32 subnets 6 hosts each |
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/30 |
255.255.255.252 (11111110) 7 bits on 1 bit off Block size of 4 Subnets 0, 4, 8, 12, 16, 20, 24, 28... 64 subnets 2 hosts each |
