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Chapter 3: Network Access, All devices on the same network must have the…
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- All devices on the same network must have the identical network portion
- The Subnet Mask helps devices identify the network portion and host portion
- Unique IPv4
- Subnet mask
- identifies the network/host portion of the IPv4 address
- Default gateway
- IP address of the local router interface
- IPv4 address is compare to the subnet mask bit by bit, from left to right
- Is one of three basic binary operation used in digital logic
- Used to determine the Network Address
- The Logical AND of two bits yields the following result:
1 AND 1 = 1
0 AND 1 = 0
0 AND 0 = 0
1 AND 0 = 0
- Shorthand method of expressing the subnet mask
- Equal the number of bits in the subnet mask set to 1
- Written in slash notation, /followed by the number of network bits
- Host portion is all 0s
- 192.168.10.0/24
.00000000
- Host portion is all 0s and ends with a 1
- 192.168.10.1/24
.00000001
- Host portion is all 1s and ends with a 0
- 192.168.10.254/24
.11111110
- Host portion is all 1s
- 192.168.10.255/24
.11111111
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- Not routable
- used only in internal network
- Must be translated to a public IPv4 to be routable
- American Registry for Internet Numbers (ARIN) - North America
- Reseaux IP Europeans (RIPE) - Europe, the Middle East, and Central Asia
- Asia Pacific Network Information Centre (APNIC) - Asia and Pacific regions
- African Network Information Centre (AfriNIC) - Africa
- Regional Latin-American and Caribbean IP Address Registry (LACNIC) - Latin America and some Caribbean islands