Which of the following are available methods of classifying packets in DiffServ on Cisco routers? (Choose three answers.)
- Matching the IP DSCP field
- Matching the 802.1p CoS field
- Matching fields with an extended IP ACL
- Matching the SNMP Location variable
Explanation: In general, matching a packet with DiffServ relies on a comparison to something inside the message itself. The 802.1p CoS field exists in the data-link header on VLAN trunks; the IP DSCP field exists in the IP header; and extended ACLs check fields in message headers. The SNMP Location variable does not flow inside individual packets but is a value that can be requested from a device.
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