Title: Class Outline 5
Course: KVCC CPT128 > Section: Class Outlines

1.      Assignment 2

2.      Connectionless versus connection oriented

a.      Connectionless

i.           Does not require a connection to be established data can be sent when necessary.

ii.           Can be less reliable because there is no confirmation of receipt.

iii.           Each packet has full source and destination address.

b.      Connection

i.           Similar to a phone call or circuit switching.

ii.           A connection is established and a route selected

iii.           Each packet is labeled by a connection id

3.      The TCP/IP model

a.      Link – This layer is also sometimes referred to as the network to host or network layer. There is not much documentation on this layer and it was left fairly vague with details filled in by the manufacturers. Essentially this just describes the link between hosts and the network transmission media.  TCP/IP can work with just about any medium or interface.

b.      Internet – This layer is critical when it comes to getting on the Internet. This is where packet switching comes into play. Messages are broken down and sent in this layer to their appropriate destination.

c.      Transport – The same layer that is present in the OSI Model. Deals with the communication between two computers. Breaks down data into packets and reassembles them on the other end.

d.      Application – A combination of the top three layers of the OSI Model with the session and presentation layers being combined and those functions being implemented where necessary.

4.      The books model

a.      Physical – transmission of bits across network media as electrical or other signals

b.      Link – sends packets of determined length with the necessary level of reliability.

c.      Network - linking of networks within networks so that packets can transverse across them.

d.      Transport – strengthens the network layers and provides reliability.

e.      Application – contains the programs that make use of the network.

5.      Problems with both models

a.      OSI

i.           The layers do not express network transmission effectively. The session and presentation layers are hardly used with the bottom layers being overloaded.

ii.           Some concepts such as addressing appear in multiple layers which confuses things.

iii.           The book states connection to governments make some refuse to listen due to the fact they do not desire organizations to tell them what to do.

b.      TCP/IP

i.           Is less structured and thus becomes a bad guide for designing new networks.

ii.           Only works with TCP/IP stack you cannot describe other protocols with this model.

iii.           Link layer is not really a layer but instead an interface between layers.

iv.           No distinguishing between the physical and data link layer.

Attached Files: | - KVCC CPT128_FundNetworkAdmin_Outline 5.pdf