| Exam 300-070 | Question id=3542 | QoS Model |
According to the DiffServ architecture RFC-2475, which two major components are necessary to deliver end-to-end QoS?
| A. |
Layer 2 transport QoS mechanism such as FRF.12 | |
| B. |
packet marking with 6 bits to classify packets | |
| C. |
ToS or IP precedence with 3 bits | |
| D. |
PHB | |
| E. |
RSVP |
In order to deliver end-to-end QoS, this architecture (RFC-2475) has two major components-packet marking using the IPv4 ToS byte and PHBs. Unlike the IPprecedence solution, the ToS byte is completely redefined. Six bits are now used to classify packets. The field is now called the Differentiated Services (DS) field, with two of the bits unused.