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Switch ports operating in which two roles will forward traff

题目
多选题
Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）
A

alternate

B

backup

C

designated

D

disabled

E

root

参考答案和解析
正确答案： D,C
解析： 暂无解析
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相似问题和答案

第1题：

What are three methods that may be use d to allow a switch to determine which ports to forward IP multicast messages to?()

A. IGMP

B. IGMP snooping

C. PIM

D. CGMP

E. static assignment

F. CDP


参考答案：B, D, E

第2题：

Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? ()

A.Switch A - Fa0/0

B.Switch A - Fa0/1

C.Switch B - Fa0/0

D.Switch B - Fa0/1

E.Switch C - Fa0/0

F.Switch C - Fa0/1


参考答案：B, C, D

第3题：

What are two characteristics of "store and forward" switching? (Select two answer choices)

A．Latency fluctuates regardless of frame. size.

B．The switch receives the complete frame. before beginning to forward it.

C．Latency through the switch varies with frame. length.

D．The switch checks the destination address upon receipt of headers.


正确答案：BC
解析：Explanation:
With store-and-forward, the entire frame. is received by the switch before the first bit of the frame. is forwarded. As soon as the incoming switch port receives enough of the frame. to see the destination MAC address, the forwarding decision is made and the frame. is transmitted out the appropriate outgoing port to the destination device. So, each frame. might experience slightly less latency. Store and forward switching may add latency when compared to other switching methods such as cut through, but it can reduce the amount of errors that become forwarded through a network.

Incorrect Answers:
A. The amount of latency that is introduced with this method of switching is dependent on the size of the frame, as the switch must wait to receive the entire frame. before sending it.

D. The switch must wait for the entire frame. before forwarding it on, and not just the headers.

第4题：

Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）

  • A、alternate
  • B、backup
  • C、designated
  • D、disabled
  • E、root

正确答案:C,E

第5题：

What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table()。

A.The switch will not forward unicast frames.

B.The switch will forward the frame to a specific port.

C.The switch will return a copy of the frame out the source port.

D.The switch will remove the destination MAC from the switch table.

E.The switch will forward the frame to all ports except the port on which it was received.


参考答案：B

第6题：

Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?()

A.alternate

B.backup

C.designated

D.disabled

E.root


参考答案：C, E

第7题：

Refer to the exhibit.Switch－1 needs to send data to a host with a MAC address of 00b0.d056.efa4.What will Switch－1 do with this data?()

A.switch-1 will drop the data because it dose not have an entry for that MAC address

B.switch-1 will flood the data out all of its port from which the data originated

C.switch-1 will forward the data to its default gateway

D.tch-1 will send an ARP request out all its ports except the port from which the data originated


参考答案：B

第8题：

A Ezonexam Ethernet switch receives a unicast frame. with a destination MAC that is listed in the switch table. What will this switch do with the frame?

A. The switch will forward the frame. to a specific port

B. The switch will forward the frame. to all ports except the port on which it was received

C. The switch will return a copy of the frame. out the source port

D. The switch will not forward unicast frames

E. The switch will remove the destination MAC from the switch table

F. None of the above.


正确答案：A
A 解析：Explanation:
How Does the Switch Find Host MACs?
Let's use the diagram below to help us understand how address learning process takes place.


Let's assume that we have just powered on the switch. It has nothing in its MAC table. We connect the cables from the hosts on the switch interfaces as shown in the diagram. Host A initiates a connection towards Host D, and the following takes place:
1. Host A (interface fe0/0) sends a frame. to Host D (MAC address:0000.43c5.334c).

2. The switch inspects the Source Address in the frame. and notes in its table the MAC address of Host A along with the Interface number from which the frame. originated.

3. The switch inspects the Destination Address in the frame. Since it does not have Hosts D MAC address in its table, it constructs a broadcast frame. and forwards out all interfaces except the interface from where the original frame. arrived.

4. Host D identifies itself as the expected recipient and responds back to Host A. The switch receives the respond frame. on interface fe0/11 and places the SA in its table along with the interface number where the frame. came from.

5. From now on, further communication between the two hosts will be switched to the appropriate interfaces based on the MAC tables entries.

This process takes place every time a new host is attached on the switch and initiates traffic. The switch tries to keep its MAC table up-to-date, therefore if some hosts do not initiate traffic for a certain amount of time, the switch removes them from its table and reinserts them when they begin sending traffic.

第9题：

Which two statements about voice VLANs are correct？（）

  • A、Voice VLANs eliminate the need for QoS configuration
  • B、Voice VLANs are used on trunk links to eliminate the need for QoS CoS markings
  • C、Voice VLANs are mainly used to reduce the number of access switch ports that are used in the network
  • D、Voice VLANs can be configured to forward existing CoS priorities or override them
  • E、Voice VLANs are mainly used between access layer switches and distribution layer switches
  • F、Voice VLANs can be configured on Layer 2 ports only

正确答案:D,F

第10题：

What are three methods that may be use d to allow a switch to determine which ports to forward IP multicast messages to?（）

  • A、IGMP
  • B、IGMP snooping
  • C、PIM
  • D、CGMP
  • E、static assignment
  • F、CDP

正确答案:B,D,E

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