A.IP precedence bits
B.DSCP bits
C.original port numbers
D.DE bits
E.source IP address
F.destination IP address

A.a class can be inentified as a single application .multiple applications with similar service nees.or be based on the source or destination ip addresses.
B.a drawback of the diffserv model is that it does not provide backward compatibility with devices that can only use the tos field.
C.diffserv uses the diffserv field in the MAC header to mark frames into behavior aggregates（BAs）
D.the diffserv field occupies the same eight bits of the mac header that were previously used for the tos field.
E.the first six high-order bits of the diffserv field are used to identify the resource reservation protocol（RSVP） value .
F.the primary goal of diffserv is scalabilty.

A. security services
B. TACACS+services
C. Mpls services
D. Routing services
E. Ppp0e services
F. Poe services

A. incoming interface.outgoing interface.ip precedence.and differentiated services code  P.oint（DSCP）.
B. Incoming interace.ip precedence.differentiated services code point（DSCP），and source or d.estination address.
C. Outgoing interface.ip precedence.differentiated services code point（DSCP）.and source or d.estination address.
D. Incoming interface .outgoing interface.ip precedence and differentiated code point s.ervices（DCPS）
E. Incoming interface .ip precedence .and source or destination address. 
F. Outgoing interface.ip precedence .and source or destination address.

A. telnet traffic originating from the router will be rate limited unless it is destined for hosts 10.1.1.1 or 10.1.1.2
B. the configuration will not rate limit any telnet traffic until it is applied to a router interface.
C. All telnet traffic destined for the router will be rate limited.
D. telnet traffic from hosts 10.1.1.1 and 10.1.1.2 destined for the router will not be rate limited.