Well said. I'm glad you corrected yourself. ;-) Frame Relay is connection-oriented. An end point can't send data until a virtual circuit has been established. But it doesn't offer a reliable service. If a frame arrives damaged, the recipient knows this (because the FCS doesn't match the sender's), but the recipient simply drops the frame. An upper layer, such as TCP, would have to notice the lack of ACK and retransmit. Frame Relay does error detection, but no error correction.
_______________________________ Priscilla Oppenheimer www.troubleshootingnetworks.com www.priscilla.com Peter van der Voort wrote: > > Thinking of the subject again, I would have to come back to > what I've said > before. > > TCP is connection oriented because there's the three-way > handshake session > establishment. It's reliable because of the retransmission and > error > checking mechanismns. > > UDP is connectionless, because there's no session establishment > and it's > unreliable because of a lack of retransmission and error > checking > mechanismns. > > Frame relay is connection oriented because of the establishment > of a > circuit, but unreliable because there are no retransmission and > error > checking mechanismns. > > X25 is connection oriented and reliable. > > Peter > > > > -----Original Message----- > From: ""B.J. Wilson"" [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, October 02, 2002 3:14 PM > To: [EMAIL PROTECTED] > Subject: RE: Frame Relay: connectionless or connection-orie > [7:54707] > > > Well, I tend to look at things from a "global" or "Layer 1 > through 7" > perspective: does Frame Relay perform the same functions that > TCP does? In > other words, does it perform a check to make sure every single > IP packet (or > Frame Relay frame) makes it from the ingress point of the Frame > cloud to the > egress point? I don't believe it does, and therefore I > consider it > connectionless. > > Now, from a *test* perspective (grrrr...), I suppose the > "correct" answer is > "connection-oriented" due to the reasons that Peter specified. > > BJ > > > > On Wed, 2 Oct 2002 13:03:09 GMT ccnp ccnp2002 wrote: > > > Pre-established path, that is it. It surprises > > me all this confusing > > literature I read. > > > > When I was reading for my CCNA a few months > > back, I was going through this > > thing time and again from a Cisco-Authorized > > Course, namely, Frame Relay is > > connection-oriented because of a > > pre-established path. > > > > What do I believe?? > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54740&t=54707 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
