Transcript TCP/IP Model - Lindsay C Haley's ePortfolio
Natalie DeKoker, Lindsay Haley, Jordan Lunda, and Matthew Ott
• A number assigned to each computer or device connected to a network using the internet.
• They are displayed as binary numbers • Dispersed by the Internet Assigned Numbers Authority (IANA)
Data Packet 192.168.1.1
192.168.1.2
• Using example
IP address
slide
192.168.1.0
• •
Host ID = last 8 (down to 2) numbers Network ID = first 24 (up to 30) numbers of
• • • •
11000000.10101000.00000001.
000000 00 (192.168.1.0) 11000000.10101000.00000001.
000000 01 (192.168.1.1) 11000000.10101000.00000001.
000000 10 (192.168.1.2) 11000000.10101000.00000001.000000 11 (192.168.1.3)
• Default Gateway and Routing Table
• Allows a computer to tell if the receiving computer is on the same LAN • Always 32 bits – a decimal every 8 bits (octets)
From: To: Subnet Mask: 00010101 .01000000
.01101001
.00000001
00010101 .01000000
.01101001
.00000010
11111111 .11111111
.11111111
.00000000
(21.64.105.1) (21.64.105.2) (255.255.255.0) If Logical AND operation is true, then we are on the same LAN!
11111111.00000000.00000000.00000000 = /8 (Class A) 11111111.11111111.00000000.00000000 = /16 (Class B) 11111111.11111111.11111111.00000000 = /24 (Class C) 11111111.11111111.11111111.11000000 = /26
Calculate Number of Subnets 2^ (number of network ID extension digits) – 2 = number of new subnets Modify Subnet Mask 11111111.11111111.11111111.0000000
11111111.11111111.11111111.
11 00000 • • •
Host ID = usually last 8 numbers Network ID = usually first 24 numbers of
•
11000000.10101000.00000001.
01 000000 (192.168.1.64) 11000000.10101000.00000001.
10 000000 (192.168.1.128)
Calculating Hosts From number of zeroes in binary address of the subnet mask, we get: 2 (number of zeroes) – 2 = number of possible hosts Note: The more subnets we make, the less hosts we can have per subnet!
CIDR = Classless Inter-Domain Routing This is how ISP’s allot their IP addresses.
A Request node with the IP address is B Reply
• Allows host to communicate with other hosts when only the neighbor address is known • Host requests own IP address via network • Host sends hardware address (MAC) • Network assign IP address 192.168.0.1
2e:3d:6c:4f:b2:15
• • Network automatically assigns IP address DHCP Anyone out there?
Can I have an IP address?
your IP address?
This address will expire in 7 days.
Yes, please. Ok!
• APIPA Anyone out there?
Can I have an IP address?
Ok, I’ll assign myself 169.254.0.3 for now, and I’ll check back later.
ZZZzzzZZZzzzZZZ
• Manually assigning addresses • Assign a unique address!
172.22.37.8
• Manually assigning addresses • Assign a unique address!
• Verify by pinging a known IP address