题目内容（请给出正确答案）

[主观题]

When are packets processed in an inbound access list？（）

A. Before they are routed to an outbound interface.

B. After they are routed for outbound traffic.

C. After they are routed to an outbound interface while queuing.

D. Before and after they are routed to an outbound interface.

E. Depends on the configuration of the interface

F. None of the above

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更多“When are packets processed in …”相关的问题

第1题

What could a MS do when its state changes from idle to ready？（）

A.Power on

B.PDP context activation

C.GPRS attach

D.Transferring packets

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第2题

When HSRP is configured on a network, which two of these items are provided, which are sharedbetween the routers that run HSRP？（）（Choose two.)

A. TCP-based hello packets

B. the impact of flapping links if timers are too low

C. a shared single interface

D. the ability to track serial interfaces

E. UDP-based hello packets

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第3题

What can MS do when it is standby state？（）

A.Transfer data packets

B.Receive PS or CS paging

C.Do nothing

D.Cell update

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第4题

About congestion control, which of the following is wrong?()

A.Traditional packet loss policy is tail-drop. When length of a queue reaches a maximum value, all new packets will be dropped.

B.In RED algorithm, each queue is set a pair of low and high limit values. When length of the queue is lower than the low limit, packets will not be droppeD.When the length exceeds the high limit, all packets will be droppeD.When the length is between low limit and high limit, packets will be dropped randomly.

C.Random number generated by WRED is based on priority. It introduces IP priority differentiated drop policy, so probability of dropping packets with high priority is small.

D.Currently, default congestion control for PTN device is Radom-Drop.

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第5题

By default, max. packet length supported by interfaces is 1668 bytes. When traffic flo

ws from service access side of PE device to network side, new Ethernet header and two TMPLS labels need to be added for service packets, which may increase the packet length by()bytes. When UNI side receives packets with length over 1642 bytes, packets will be dropped due to the addition of header at NNI side, affecting service performance. Therefore, jumbo frame. forwarding function on all service related interfaces should be enabled.

A.20

B.24

C.26

D.30

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第6题

About common test items for Ethernet service, which of the following are correct?()

A.Throughput is the maximum available transmission rate in case of no packet losses.

B.Frame loss rate is the percentage of successfully forwarded packets out of a certain traffic loaD.Causes for packet loss include network congestion, timeout, disorder and frame. error.

C.Latency is the interval from when a packet is received to when it is forwarded in case of no packet losses. Perform. latency test for several times and take their average value.

D.Back-to-back frames refer to maximum number of packets that can be processed by an IP network device, in case of no losses of packets which are received at a minimum transmission interval.

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第7题

When building an IP multicast domain using PIM which mode assumes that other routers do not want to forward multicast packets for the group？（）

A. PIM - DM

B. PIM - SM

C. PIM - RP

D. CGMP

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第8题

When we use VolP service，the voice packets over the Internet arrive at their destination i

n a（） stream.

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第9题

Which of the following correctly describe steps in the OSI data encapsulation process？（）

A. Transport layer divides a data stream into segments & adds reliability & flow control information

B. Data link layer adds physical source & destination address & an FCS to the segment

C. Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information

D. Packets are created when the network layers adds layers 3 address & control information to a segment

E. The presentation layer translated bits into bits into voltages for transmission across the physical link

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第10题

What is one of the reasons that custom QoS ACLs are recommended over automatic QoS when configuring ports on a Catalyst 6500 for use with IP phones？（）

A. 79xx IP phones do not automatically mark voice packets with non-zero DSCP values.

B. 79xx IP phones do not mark protocol packets such as DHCP, DNS, or TFTP with non-zero DSCP values.

C. 79xx IP phones do not mark voice packets with optimal DSCP values.

D. 79xx IP phones use a custom protocol to communicate CDP information to the switch.

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