Those who control the present control the past. Those who control the past control the future.
Originally posted by: EULA
Those who control the present control the past. Those who control the past control the future.
Good 'ol Kane
Originally posted by: TheCause
Every book that Cisco produces is filled with stupid flaws. What kind of group decides that ping is suddenly an acronym anyway!!! AGGGHGHHH! *sigh. There is a book that is publicly available for download that covers Cisco materials. It's a project totaly independant of Cisco Systems.
Originally posted by: TheCause
Every book that Cisco produces is filled with stupid flaws. What kind of group decides that ping is suddenly an acronym anyway!!! AGGGHGHHH! *sigh. There is a book that is publicly available for download that covers Cisco materials. It's a project totaly independant of Cisco Systems.
Originally posted by: Blaizer2
Polm,
Obviously a trick question...the datagram, packet, whatever you want to call it at layer three, contains ALL of the above.
r/ Blaiz :beer:
Originally posted by: Blaizer2
Polm,
If you have CICCO's First Year Companion Guide take a look at Figure 10-9 on pg 386. What did Ciosco say was the right answer?
r/ Blaiz
Originally posted by: spidey07
UDP has acknowledgements...meaning server sends data and client acknowledges data, but it relies on the upperlayer protocol for sequencing.
TCP as a TRANSPORT layer does the sequencing, acks and sliding window, retransmissions for data transfer - the upper layer protocol doesn't need to worry about it, tcp handles it as the transport layer.
So UDP does indeed form a connection on a transport layer - there are PORT numbers involved that when combined with IP addresses create a connection. But it is called CONNECTIONLESS because as a TRANSPORT layer it is not responsible for the retransmission of data.
confusing?
TCP handles the actually transfer of data via sequencing, acknowledgements and sliding windows.
UDP does not, it merely ACKS data.
And that is the key between connection oriented and connection-less oriented transport layers. Most of this stuff becomes stunningly clear when you look at sniffer traces of the various kinds of packets and really see what is going on the wire and get to see each of the OSI layers broken out.
There is a reason that this OSI stuff is ground into network people over and over and over again. Its because it is so dang important and is the very foundation that network communications is built on. Kinda like if you want to be a bridge builder you better know the basic properties of the materials involved and the math as well.
Originally posted by: rtunez33
Originally posted by: spidey07
UDP has acknowledgements...meaning server sends data and client acknowledges data, but it relies on the upperlayer protocol for sequencing.
TCP as a TRANSPORT layer does the sequencing, acks and sliding window, retransmissions for data transfer - the upper layer protocol doesn't need to worry about it, tcp handles it as the transport layer.
So UDP does indeed form a connection on a transport layer - there are PORT numbers involved that when combined with IP addresses create a connection. But it is called CONNECTIONLESS because as a TRANSPORT layer it is not responsible for the retransmission of data.
confusing?
TCP handles the actually transfer of data via sequencing, acknowledgements and sliding windows.
UDP does not, it merely ACKS data.
And that is the key between connection oriented and connection-less oriented transport layers. Most of this stuff becomes stunningly clear when you look at sniffer traces of the various kinds of packets and really see what is going on the wire and get to see each of the OSI layers broken out.
There is a reason that this OSI stuff is ground into network people over and over and over again. Its because it is so dang important and is the very foundation that network communications is built on. Kinda like if you want to be a bridge builder you better know the basic properties of the materials involved and the math as well.
No offense, but a lot of the stuff you have been saying is dead wrong
Originally posted by: BS911
Originally posted by: spidey07
I was only trying to help.
Yeah i know
Originally posted by: polm
Originally posted by: BS911
Originally posted by: spidey07
I was only trying to help.
Yeah i know
Please, enlighten us all BS911.
Originally posted by: BS911
Originally posted by: polm
Originally posted by: BS911
Originally posted by: spidey07
I was only trying to help.
Yeah i know
Please, enlighten us all BS911.
HUH? What are you talking about?
I said i know Spidey was just trying to help and that guy comes and had to make a negative comment.