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Welcome to Back! TCP/IP Subnetting Pop Quiz TCP/IP Cheat Sheet.

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Presentation on theme: "Welcome to Back! TCP/IP Subnetting Pop Quiz TCP/IP Cheat Sheet."— Presentation transcript:

1

2 Welcome to Back!

3 TCP/IP Subnetting

4 Pop Quiz TCP/IP Cheat Sheet

5 IP Addresses My localhost -> > www.yahoo.com

6 IP Addresses IP Address: Network Portion: Node Portion: Every IP Address has a node portion and a network portion

7 Subnet Mask IP Address: Subnet Mask: Network ID: The subnet mask tells us which part of an IP address is the node portion vs. the network portion An IP address without a subnet mask is meaningless

8 Binary ANDing AND is a mathematical operator just like + (plus) and – (minus) = 2 1 AND 1 = 1

9 AND Truth Table A | B | A AND B FALSE|FALSE|FALSE FALSE|TRUE|FALSE TRUE|FALSE|FALSE TRUE|TRUE |TRUE

10 AND Truth Table A B A AND B

11 AND Truth Table 0 AND 0 = 0 0 AND 1 = 0 1 AND 0 = 0 1 AND 1 = 1

12 Man vs Machine Human readable dotted decimal notation –Each number represents an “Octet” or 8 bits What the computer sees:

13 Subnet Mask and ANDing IP: Subnet: IP: Subnet: AND IP: Subnet:

14 TCP/IP Cheat Sheet: The Rules The Subnet/network address is always hidden behind the 1s in the mask IP: Subnet:

15 TCP/IP Cheat Sheet: The Rules The Host/Node address is always hidden behind the 0s in the mask IP: Subnet:

16 = = TCP/IP Cheat Sheet: The Rules (Except in special cases) The all-1s and all-0s subnet addresses are invalid (but NOT in CIDR) Ex. Network ID Subnet Mask > s hide the host address 1s hide the subnet address Breaks the rule! ( except in CIDR ) These bits belong to the Big IP in the Sky (we can’t change them) These are the bits that we own

17 TCP/IP Cheat Sheet: The Rules (Except in special cases) The all-1s and all-0s host addresses are invalid (Always) Ex. IP Address: Subnet Mask: OR IP Address: Subnet Mask:

18 Reason Behind the Rule The all zeros host address is the same as the network ID Ex.IP: Subnet: Network ID: The all ones host address is reserved for the broadcast address

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20 Practice Problems 1 AND 1 1 AND 0 0 AND 1 0 AND AND AND AND

21 Practice Problems b to Decimal 137d to Binary


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