How the Receiving Host Handles the Packet

-------1. Physical Network Layer
Receives the packet in its frame form. It computes the CRC of the packet and then sends the frame to the data link layer.
------2. Data-Link Layer
Verifies that the CRC for the frame is correct and strips off the frame header and CRC. Finally, the data link protocol sends the frame to the Internet layer.
------3. Internet Layer
Reads information in the header to identify the transmission and determine if it is a fragment. If the transmission was fragmented, IP reassembles the
fragments into the original datagram. It then strips off the IP header and passes the datagram on to transport layer protocols
------4. Transport Layer (TCP and UDP)
Reads the header to determine which application layer protocol must receive the data. Then TCP or UDP strips off its related header and sends the message or stream up to the receiving application.
-----5. Application Layer
Receives the message and performs the operation requested by the sending host.

---------Planning Your Network
This chapter describes the issues you must resolve in order to create your network in an organized, cost-effective manner. When you have resolved these issues, you can devise a plan for your network to follow as you set it up and administer it in the future.
Network Administrator:
Responsibilities of the Network Administrator
As a network administrator, your tasks generally will fall into four areas:
• Designing and planning the network -chap 3
• Setting up the network -chap 4
• Maintaining the network -chap 6
• Expanding the network
-------Expanding the Network
Several options are available for expanding your network:
• Setting up a new network and connecting it to the existing network using a
machine functioning as a router, thus creating an internetwork.
• Configuring machines in users’ homes or in remote office sites and enabling
these machines to connect over telephone lines to your network.
• Connecting your network to the Internet, thus enabling users on your
network to retrieve information from other systems throughout the world.
• Configuring UUCP communications, enabling users to exchange files and
electronic mail with remote machines.
----------What TCP/IP Is