Topic 19 TCP/IP Enabling Objectives 19.1 DESCRIBE the OSI model and the TCP/IP Protocol DISCUSS IP addresses IDENTIFY common TCP/IP based protocols.

ARP DNS DHCP FTP HTTP ICMP LDAP OSPF PPP PPTP IRC RIP SNMP SMTP POP TELNET IP TCP IGMP EGP IGP SMB Network Devices Transfer Mediums Protocols Basic Network Components

OSI Reference Model Physical Data Link Network Transport Session Presentation Application LLC Sublayer MAC Sublayer Layer 7 Layer 6 Layer 5 Layer 4 Layer 3 Layer 2 Layer 1

How data transfer’s over a network Physical Data Link Network Transport Session Presentation Application Physical Data Link Network Transport Session Presentation Application Host B End Product Screen Layout Start, Stop, Resume End-to-End Management Address and Routing Media Access Binary Transmission MEDIA Host A

OSI model template for TCP/IP Application Transport Application Presentation Session Transport Network Data Link Physical OSI MODEL TCP/IP Model Network Data Link Physical

TCP/IP Model Application Transport ETHERNET Physical LAYER 1 LAYER 2 LAYER 3 LAYER 4 LAYER 5 Network IRC DNS SMTP SNMP POP3 TELNET HTTP ARP/RARP IP ICMP DHCP IGMP RIP TCPUDP OSPFIGP EGPBGP

IP Datagram Structure Version (4 bits) Header Length (4 bits) Type of Service (8 bits) Total length of Datagram (16 bits) Datagram Identification (16 bits) Flags (3 bits) Fragment Offset (13 bits) Time To Live (TTL) (8 bits) Protocol (8 bits) Header Checksum (16 bits) Source IP Address Destination IP Address IP Options (will be padded to fit in the 32-bit boundary) Data portion of Datagram

TCP/IP Port Numbers Well known port numbers Port numbers in GCCS

Each Device Requires 3 IP’s 1 st Octet Range # Hosts CLASS A 1 – ,777,214 CLASS B128 – ,534 CLASS C192 – CLASS D224 – 239 Used for multicast Default Subnet Masks Class A Class B Class C Class DN/A 2. Subnet Mask1. Unique IP  Every device connected to a TCP/IP network requires at least one Internet Protocol (IP) address and it must be unique.  An IP address is commonly represented in dotted decimal notation; this makes them easier to read than in binary format. Example: vice  IP addresses are also broken down into classes.

What does Subnet Mask do? Destination IP Address = Subnet Mask = ANDING = Extracted Network address Local Network Address = Default Gateway IP Datagram “ANDING”

Each Device Requires 3 IP’s (cont.) 3.

Basic IP Routing Application Transport Network Data Link Physical Application Transport Network Data Link Physical Network Data Link Physical ROUTER

TCP/IP = Postal Service TYPED LETTER LETTER CARRIER BAG TYPED LETTER ADDRESSED ENVELOPE TYPED LETTER ADDRESSED ENVELOPE LETTER CARRIER BAG TYPED LETTER ADDRESSED ENVELOPE RECEIVE LETTER PROCESS SEND

Letter analogy $.44

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