At 11:24 PM 10/30/01, Albert Y. Pak wrote: > [ The following text is in the "iso-8859-1" character set. ] > [ Your display is set for the "US-ASCII" character set. ] > [ Some characters may be displayed incorrectly. ] > >True, I wasn't reading the question right. I was thinking about if the WAN >link was crack down.
What does "crack down" mean? I've never heard of that. >In that case, I believe there will be a collisions on a >serial link... The question comes up rather often because it's on a certain test or practice tests for a certain test. It's sort of a trick question to catch people who have never though about why "show int" has a collision counter (the programmers used a template). Collisions are for CSMA networks. The question is meant to catch people who are clueless or who over-think questions. >Albert > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of >Priscilla Oppenheimer >Sent: Tuesday, October 30, 2001 1:15 PM >To: [EMAIL PROTECTED] >Subject: RE: Collisions on a Serial Line [7:24601] > > >Whether a protocol is reliable or not has nothing to do with collisions. >Collisions have to do with media access control at the data-link layer. > >Ethernet is not reliable. It's best effort. The only problem it monitors is >collisions, (if you're using half-duplex). > >Cisco's HDLC is not reliable. That's not relevant as far as to whether it >has collisions, however. What is relevant is its media access control, >which is very simple because there's nothing else sharing its transmit >circuit, so it can send whenever it wants. It's used on point-to-point >circuits. > >X.25 is a network-layer protocol so it is not relevant to a question that >is asking about a media-access control function. > >Priscilla > >At 10:57 PM 10/29/01, Albert Y. Pak wrote: > >That's depending on the WAN side what technology you are using. If you are > >using Frame Relay or HDLC between the WAN side via serial link, there will > >be no collision. Since Frame Relay and HDLC are connection-oriented but not > >reliable. All the re-transmission are done by between 2 hosts of each > >opposite end. In case of using X.25, there will be a collision since X.25 >is > >connection-oriented and reliable. 2 routers between the serial line will do > >all the re-transmission. So there will be a collision. > >HTH > >Albert > > > >-----Original Message----- > >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > >Dave Luancing > >Sent: Monday, October 29, 2001 10:03 PM > >To: [EMAIL PROTECTED] > >Subject: Collisions on a Serial Line [7:24601] > > > > > >Is it possible to have collisions on a serial line ?? > >if so, what causes this? > > > >- D.L. > > > >__________________________________________________ > >Do You Yahoo!? > >Make a great connection at Yahoo! Personals. > >http://personals.yahoo.com >________________________ > >Priscilla Oppenheimer >http://www.priscilla.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24967&t=24601 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
