先試後買

A. PIR = 1.25Mbps, CIR = 1.25Mbps

B. PIR = 4Mbps. CIR = 1Mbps

C. PIR = 5Mbps, CIR = 1.25Mbps

D. PIR = 10Mbps, CIR = 1Mbps

E. PIR = 1Mbps, CIR = 1 Mbps

A. A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.

B. The default scheduler spends an equal amount of time servicing each queue that has traffic to be sent out.

C. Queue-type can be configured as best-effort, expedite, or auto-expedite.

D. A queue configured as auto-expedited will be an expedited queue as long as no Best Effort FC is mapped to it.

A. network

B. SAP-ingress

C. slope

D. scheduling

E. network-queue

A. When the shared buffer utilization is at 61%, only in-profile packets are currently in the shared buffer pool.

B. When the shared buffer utilization reaches 55%, both in-profile and out-of-profile packets may be dropped.

C. The maximum probability with which an out-of-profile packet can be dropped is higher than that of an in-profile packet.

D. The discard probability slope of an in-profile traffic is steeper than that of an out-of-profile traffic.

E. All out-of-profile traffic will be dropped before that of any in-profile traffic.

A. Diffserv classifies packets into forwarding classes only at the first network hop.

B. IntServ uses a protocol like RSVP to provide QoS guarantees on a per-flow basis.

C. Intserv requires that network routers allocate resources for thousands of individual flows.

D. DiffServ groups multiple microflows into bigger streams called macro flows.

A. Priority is used when a packet enters a SAP-ingress queue.

B. A packet is accepted into a queue based on its priority and forwarding class.

C. Both high priority-only buffer space and WRED can be used in a queue.

D. Buffer admission control limits the number of out-of-profile packets that enter the queue.

A. The DSCP value will remain as ef.

B. The DSCP value will be set to af23.

C. The DSCP value will be set to af21.

D. The EXP value, in the MPLS headers, will be set to 3.

E. The EXP value, in the MPLS headers, will be set to 4.

A. FALSE

B. TRUE

A. It will be queued in the shared portion of the buffer pool but contend for shared buffer space with packets from other queues.

B. It will be queued in the reserved portion of the buffer pool and remain out-of-profile.

C. It will be queued in the shared portion of the buffer pool but may be dropped if the buffer utilization exceeds the start-average value of the low slope.

D. It will be queued in the reserved portion of the buffer pool if there are no in-profile packets already in the queue.

E. It will be queued in the reserved portion of the buffer pool and be in-profile.

A. 802.1p value

B. TCP/UDP port numbers

C. DSCP value

D. HTML version number

E. IP DF bit

A. Port ingress, port egress, network egress

B. Port ingress, network ingress, network egress

C. Access ingress, access egress, network egress

D. Access ingress, network ingress, network egress

E. Port ingress, port egress, shared bi-directional

A. 802.1p uses a field in the 802.1Q header.

B. 802.1p uses a field in the Layer 3 IP header

C. 802.1p defines a 3-bit Class of Service field.

D. 802.1p specifies 64 different priority levels.

E. 802.1p adds 16 bits to the Layer 3 header.

F. 802.1p adds 16 bits to the Layer 2 header,

A. 768 MB dynamically allocated between ingress and egress.

B. 512 MB ingress, 512 MB egress

C. 256 MB ingress, 256 MB egress

D. 768 MB, with a minimum of 256 MB ingress and egress, and an additional 256 MB dynamically allocated.

E. 1 GB dynamically allocated between ingress and egress.

A. All buffer space is initially allocated to network pools, and some of it is reallocated to access pools if service SAPs are configured on it.

B. All buffer space is initially allocated to access pools, and some of it is reallocated to network pools if network interfaces are configured on it.

C. Buffer space is allocated 50% for access pools and 50% for network pools.

D. Buffer space is allocated 25% for access pools and 75% for network pools.