Tiago Martinho

The TCP/IP Internet The TCP/IP Internet layerlayer

Tiago Martinho

Tiago Martinho

Functions of the TCP/IP Internet Functions of the TCP/IP Internet layerlayer

The The purposepurpose of the of the Internet layer is to select Internet layer is to select the the best pathbest path through the through the network for packets to network for packets to travel. travel.

The main protocol that The main protocol that functions at this layer is functions at this layer is IP. IP.

Best path determination Best path determination and packet switching occur and packet switching occur at this layer. at this layer.

TCP/IP model

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Protocols that operate at the TCP/IP Protocols that operate at the TCP/IP Internet layerInternet layer

IP provides IP provides connectionlessconnectionless, , best-effortbest-effort delivery routing of packets. IP is not concerned delivery routing of packets. IP is not concerned with the content of the packets but looks for a with the content of the packets but looks for a path to the destination. path to the destination.

Internet Control Message ProtocolInternet Control Message Protocol (ICMP) (ICMP) provides control and messaging capabilities. provides control and messaging capabilities.

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Protocols that operate at the TCP/IP Protocols that operate at the TCP/IP Internet layer (cont)Internet layer (cont)

Address Resolution Address Resolution ProtocolProtocol (ARP) (ARP) determines the data link determines the data link layer address, or MAC layer address, or MAC address, for known IP address, for known IP addresses. addresses.

Reverse Address Reverse Address Resolution ProtocolResolution Protocol (RARP) determines the IP (RARP) determines the IP address for a known MAC address for a known MAC address. address. TCP/IP protocol suite

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IP IP performs the following operationsperforms the following operations

DefinesDefines a packet and an addressing scheme. a packet and an addressing scheme.

TransfersTransfers data between the Internet layer and data between the Internet layer and network access layer.network access layer.

RoutesRoutes packets to remote hosts. packets to remote hosts.

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IPIP is sometimes referred to as an is sometimes referred to as an unreliable protocolunreliable protocol. This does not . This does not

mean that IP will not accurately mean that IP will not accurately deliver data across a network. IPdeliver data across a network. IP is is

unreliable because it does not perform unreliable because it does not perform error checking and correction. That error checking and correction. That function is handled by upper layer function is handled by upper layer

protocols from the transport or protocols from the transport or application layers. application layers.

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Special ThanksSpecial Thanks

Thanks for watching my presentation!!Thanks for watching my presentation!!

Hope you had learned something about Hope you had learned something about TCP/IP in this simple presentation. TCP/IP in this simple presentation.