Priscilla, you know I'm writing on a Mac. Still, this reminds me of Eve's explanation of giving Adam the Apple! :-)
Technically correct, of course. At 5:54 PM +0000 7/15/02, Priscilla Oppenheimer wrote: >Dan Penn wrote: >> >> Check out the outline on CCO. As far as I know SNA, IPX, and >> Applecrap, >> I mean I talk, are still there for CID. > >And, sir, why do you call it Applecrap? ;-) Seriously, can you provide some >technical reasons to disparage it? > >Perhaps it's still on Cisco tests because the philosophies behind AppleTalk >had a big impact on modern desktop protocol design. Also, many universities >and schools of all sorts still have large AppleTalk networks. You would be >surprised at how many still use it. It's also still used at scientific and >graphics arts companies. > >Many protocol designers admire the pioneering work that Apple did to make >networks plug and play. There's a new IETF working group called the Zero >Configuration Networking group that credits AppleTalk. See here for more info: > >http://www.zeroconf.org/ > >Note that IPv6 has serverless autonegotiation of network-layer addresses >which behaves quite a bit like AppleTalk. (It probably won't catch on in >many environments which have a DHCP server, but it may catch on in other >environments). And how about Microsoft's automatic addressing. (Of course we >normally only see that when DHCP has failed, but still Microsoft thought >enough of the AppleTalk mechanism to steal it. ;-) > >And how about service location? TCP/IP barely even has service location, >still to this day. Don't you think it's a little silly that we have to find >resources with a search engine? There is hope with new protocols like the >Service Location Protocol (SLP) and some of the new multicast protocols that >let you find multicasting servers. Note that the SLP RFC credits AppleTalk. > >Maybe some "expert" told you that AppleTalk is "chatty." For one thing, any >protocol that tries to automate service location, speed up routing protocol >convergence, and quickly workaround connection disconnects is going to be a >bit chatty. It's a tradeoff. AppleTalk is no more chatty than Windows >Networking or IPX. And you want chatty, how about all those keepalives and >hellos that Cisco routers send? > >Maybe that same "expert" told you to avoid AppleTalk because it broadcasts >too much. That's a myth. It uses multicasts, for one thing, which means a >decent NIC driver that doesn't do AppleTalk shouldn't bother the host. > >The descriptions you see about Chooser behavior are mostly nonsense. The >Chooser doesn't send broadcasts. It sends broadcast requests which are >forwarded (as unicasts) to each router in the zone. Those routers send a >multicast onto their networks in the zone. With good network design, this is >no problem. > >The Chooser doesn't send continually unless the user leaves it open with a >zone and service highlighted, which is almost never the case. Then it does >send rather often, but backs off after 45 seconds. The problem where it sent >the broadcast request packets (which are really unicasts) very often, >without backing off, was fixed in 1989. By then, it was too late. The >criticism of its behavior (even though already based on misinformation) was >entrenched in people's minds. > >Hey, I could go on and on, but I'll stop here, you'll be glad to see. ;-) > >________________________ > >Priscilla Oppenheimer >http://www.priscilla.com > > >> >> Dan >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On >> Behalf Of >> suaveguru >> Sent: Monday, July 15, 2002 9:53 AM >> To: [EMAIL PROTECTED] >> Subject: CID Exam 3.0 [7:48839] >> >> hi anyone knows what I should emphasize for the CID >> exam ? Should I drop SNA , appletalk? What should I >> concentrate on >> >> >> thanks >> >> suaveguru >> >> __________________________________________________ >> Do You Yahoo!? >> Yahoo! Autos - Get free new car price quotes >> http://autos.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48850&t=48839 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
