"1. What is the two status on PVC mode ? In SVC, which have three status
(call setup , transfer and call terminate). "
I have seen 3 on both ATM and Frame Relay:
Active, inactive and deleted.
Active were circuits that are "up"
Inactive were VC's that were not configured on that router that are
discovered by signaling
Deleted are VC's that are reported down by signaling.
"2. Frame Relay is a protocol name or protocol type?"
Hard question to answer.
Frame Relay is the name of a Layer 1 and 2 transport protocol for Wide area
networks. It was an upgrade from x.25, designed for higher speed lines with
lower error rates.
"3. In IPX RIP, if one router is down. The other router will send three time
keep alive packet to the dead router. If no response, this router will
delete from the routing table. How about oin IP RIP?"
IP and IPX RIP function Similarly. The entire RIP Database is sent every 30
seconds for IP RIP and every 60 seconds for IPX
RIP. IN IP RIP, if routing updates from a neighboring router have not
arrived within 180 seconds, the routes learned from that router are marked
invalid and the holddown timer of 180 seconds is started.
if no updates arrive in that 180 seconds, the routes are removed from the
routing table.
Note, the "keepalive" is one or more packets that contain the full routing
information of the router.
"4. What is benefit of partial mesh compare with fully mesh? It will use
less routers or use less virtual circuits ?"
A partial mesh costs less, compared to a full mesh. It will use the same
number of routers, but less PVC's. Each pvc costs money and adds
complexity. However, if most of the traffic is not destined for the hub,
the hub and spoke adds latency and uses bandwidth on both links. Both
designs are appropriate, depending on the nature of the traffic.
Hope this helps.
Doug
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=7004&t=6974
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