why the query result different in "snmbulkget" and "snmpbulkwalk"

dear sir,

why the query result different in "snmbulkget" and "snmpbulkwalk"

as follow underline and red word item

thanks

C:\Documents and Settings\hungta>snmpbulkwalk -v2c -Os -c public localhost system
sysDescr.0 = STRING: Hardware: x86 Family 6 Model 13 Stepping 8 AT/AT COMPATIBLE - Software: Windows 2000 Version 5.1 (B
uild 2600 Uniprocessor Free)
sysObjectID.0 = OID: enterprises.311.1.1.3.1.1
sysUpTimeInstance = Timeticks: (1218151) 3:23:01.51
sysContact.0 = STRING:
sysName.0 = STRING: HUNGTANB
sysLocation.0 = STRING:
sysServices.0 = INTEGER: 76

C:\Documents and Settings\hungta>snmpbulkget -v2c -Os -c public localhost system
sysDescr.0 = STRING: Hardware: x86 Family 6 Model 13 Stepping 8 AT/AT COMPATIBLE - Software: Windows 2000 Version 5.1 (B
uild 2600 Uniprocessor Free)
sysObjectID.0 = OID: enterprises.311.1.1.3.1.1
sysUpTimeInstance = Timeticks: (1237095) 3:26:10.95
sysContact.0 = STRING:
sysName.0 = STRING: HUNGTANB
sysLocation.0 = STRING:
sysServices.0 = INTEGER: 76
ifNumber.0 = INTEGER: 6
ifIndex.1 = INTEGER: 1
ifIndex.3 = INTEGER: 3

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