6610-l4- - IP/TCP 1 Puzzle You have a deck of 52 cards You...

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1 IP/TCP
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Puzzle You have a deck of 52 cards You draw out 5 cards randomly and look at the cards You can now show 4 of the cards to a friend, and the friend should identify the 5 th card How do you do this?
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Groups 10 groups with 5 students each 3 groups with 4 students each If you don’t join a group, TA will put you in a group he defines Group information due to the TA by end of day today
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4 Internet Protocol (IP) Addressing Routing Fragmentation and Reassembly Quality of Service Multiplexing and Demultiplexing
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5 Addressing Need unique identifier for every host in the Internet (analogous to postal address) IP addresses are 32 bits long Hierarchical addressing scheme Conceptually … IPaddress =(NetworkAddress,HostAddress)
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6 Address Classes Class A Class B Class C 0  netId hostId 7 bits 24 bits 1  0   netId hostId 14 bits 16 bits 1 1  0  netId hostId 21 bits 8 bits
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7 IP Address Classes (contd.) Two more classes 1110 : multicast addressing 1111 : reserved Significance of address classes? Why this conceptual form?
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8 Addresses and Hosts Since netId is encoded into IP address, each host will have a unique IP address for each of its network connections Hence, IP addresses refer to network connections and not hosts Why will hosts have multiple network connections?
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9 Special Addresses hostId of 0 : network address hostId of all 1’s: directed broadcast All 1’s : limited broadcast netId of 0 : this network Loopback : 127.0.0.0 Dotted decimal notation: IP addresses are written as four decimal integers separated by decimal points, where each  integer gives the value of one octet of the IP address.
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10 Exceptions to Addressing (norm today) Subnetting Splitting hostId into subnetId and hostId Achieved using subnet masks Useful for? Supernetting (Classless Inter-domain Routing or CIDR) Combining multiple lower class address ranges into one range Achieved using 32 bit masks and max prefix routing Useful for?
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11 Examples Subnetting 192.168.1.0/24 – class C network 192.168.1.64/26 and 192.168.1.128/26 – 2 subnetworks with upto 62 stations each! Supernetting 192.168.2.0/24 and 192.168.3.0/24 – 2 class C networks 192.168.2.0/23 – 1 super network with upto 126 stations!!
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12 Weaknesses Mobility Switching address classes Notion of host vs. IP address
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13 IP Routing Direct If source and destination hosts are connected directly Still need to perform IP address to physical address translation. Why?
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This note was uploaded on 12/14/2009 for the course ECE 6610 taught by Professor Staff during the Fall '08 term at Georgia Tech.

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6610-l4- - IP/TCP 1 Puzzle You have a deck of 52 cards You...

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