Network+ Tutorial Oct 27_01

[Q327]

Which Protocol is Connection -oriented and Connectionless oriented ?

Any protocol under TCP or use TCP like HTTP , FTP , SMTP , POP are all connection-orientated ( guarantee delivery and error checking )

Any protocol that under UDP like TFTP is connectionless – orientated ( no guarantee for delivery , no error checking )


[Q328]

How to improve Web Surfing if too many users are trying to access internet at the same time within one company ?

You can implement HTTP Proxy ( one type of Proxy Server ).

HTTP Proxy ( Proxy Server ) is used to cache the Web Pages that have been accessed before .

By having the HTTP Proxy implemented in the company , the users can access the Web Pages faster

What is caching ?

Temporary store certain files/ data . Web caching , means , temporary store the web pages that have been accessed before .


[Q329]


What is meant by “access to network “ ?

Access to Network, meaning , your workstation can communicate / access with other workstation within LAN or your workstation can access / communicate to WAN ( Internet ) .

When we talk about “network” , it could be either LAN or WAN

If our workstation cannot access to the network, what should we do FIRST ?

In Network+ , you are advise to check the LINK LIGHT . The link light for NIC , Switch/HUB and Router.

If there is no Link Light , try to change to other port ( if there is no link light between NIC and Hub , we should change the UTP cable to the other port of the HUB ) , if after change to other Port of the Hub , and we start to see the Link Light , it could be the first port of the Hub that you uses was having the problem.

When there is no link light , the following problem might happen:-
NIC problem
NIC port problem
RJ45 problem
UTP Cable ( patch cable ) problem
Hub/Switch Problem ( if it is interface with NIC )
Hub/Switch’s PORT problem

Please take note , incorrect setting / wrong configuration on Network Properties ( setting wrong IP address , setting wrong DNS address , setting wrong default gateway address ) WILL NOT cause the Link Light problem

How LINK LIGHT can help us to troubleshoot ?

Link Light problem is due to PHYSICAL Problem (hardware problem , not software or configuration problem ) , it is happen on Physical Layer . It is HARDWARE Problem . Just focus on Hardware Problem

After you change the cable/port and start to see Link Light appear , try to PING it or transfer the transfer file ( sending/download the file ) see whether the file transferring is working .