slides29 Flashcards
wat does NFS take care of
- presentation issues using XDR
- composing and sending the RPC
- receiving the reply
- unpacking the results and returning them to the caller
idempotent
Fortunately, most NFS operations are idempotent, meaning they can be done more than once and get the same answer each time
NFS relies on ….
Traditionally, NFS runs over RPC over UDP
UDP was chosen for its lower overhead than TCP
But then NFS or RPC has to deal with UDP’s unreliability
NFS servers are stateless, soo…
…no information is kept on the server about past NFS requests
wot is w3b and y is it confused with the Internet
The World Wide Web (WWW) is what many people wrongly think is the Internet
This is a testament to the fact that the WWW was the major driving force behind the growth, commercialisation and general acceptance of the Internet
HTTP is the protocol that drives the WWW
wat header contains
• The HTTP version the server uses, followed by 200, a code to indicate success
• A description of the server software
• A MIME header that encapsulates the actual data
The MIME header gives additional information, such as the kind of data, its length, and its lifetime
wat is difference between HTTPS and SHTTP
In contrast, another protocol, SHTTP, is an extension to the HTTP protocol to include security and authentication
y voip exists
The marginal cost for the use of the Internet is tiny, while long-distance and international calls are expensive
wat does russel love to take the piss of wen talkin bout BT
It using VoIP over a telephone line
lets make a A denial of service attack
SYN floods
A TCP connection starts with a SYN. The server sends a
SYN+ACK, which the client ACKs
The server must save a chunk of information about the initial SYN so it can recognise the client ACK as part of the new connection; and the options, like SACK, MSS
