Provide an advantage and disadvantage of using the layered approach for computer networks.
When using web caching, we saw that the proxy server still contacted the origin server for each HTTP request it received. As a result, is the amount of traffic in the core of the network reduced?
What is the purpose of the HTTP "Cookie" field? Are the values in the HTTP message's cookie field stored at the client or server or both? Explain briefly.
Briefly explain how the traffic intensity at a certain node will affect the corresponding node's queuing delay.
Suppose that we want to change the IP address of from 128.119.40.186 to 128.119.40.186 and change this mapping in the DNS authoritative name server for Once this mapping is changed in the authoritative name server, will all future references (generated anywhere in the Internet) to be sent to 128.119.40.187? Briefly explain why or why not.