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Unformatted text preview: Basic facts Wireless link rate 450000000 Wired link rate 1000000000 Problem #1 max number of nodes Class B address space 2^16 65536 Question #2 to determine if a device is on line and to minimize polling time poll for sysUptime Question #3 maximum polling rate requires an assumption, where is the NMS located? Assumption: the NMS has an interface connected to each of the switches, ea From the problem, each switch services 1/3 of the nodes Assumption: 802.3 and 802.11 frames are the same, they are not but you we likewise, you did not need to know about RTS and CTS Also note that polling the APs, switchs and routers will be slightly faster, but s PDU size note Ethernet size 208 512b minimum IP Size 160 UDP size 64 SNMP get size 376 SNMP get response size 408 total 1216 nodes 661.97 max polling rate 916.65 Question #4 100% Question #5 ifOutOctets Question #6 on Aps, switch ports and routers, don't poll end nodes to conserve bandwidth Question #7 Need to poll at counter rollover rate or faster Each counter is can count to: 2147483647 rollover time for counters on the Aps 38.18 seconds rollover time for counters on the switches and routers 17.18 seconds poll faster than these times Question #8 Assumptions: same as before, then 450 Mbps if you change polling rate to once every 17 seconds, then: PDU size note Ethernet size 208 512b minimum IP Size...
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- Spring '10
- Network switch, 7%, 220.127.116.11, 18.104.22.168, 1.01 sec