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What information is used by a switch to forward an Ethernet

题目
单选题
What information is used by a switch to forward an Ethernet frame to its destination?（）
A

IP address

B

destination MAC address

C

ARP table entry

D

FCS checksum

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相似问题和答案

第1题：

What information is used by a switch to forward an Ethernet frame to its destination?()

A. IP address

B. destination MAC address

C. ARP table entry

D. FCS checksum


参考答案：B

第2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：

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.

正确答案:B

第5题：

Which statement is true regarding an Ethernet collision domain?（）

  • A、If a router is used, the collision domain includes all devices connected to the router.
  • B、If a hub is used, the collision domain is limited to each device and the hub.
  • C、If a switch is used, the collision domain is limited to each device and the switch.
  • D、If a bridge is used, the collision domain includes all devices connected to the bridge.

正确答案:C

第6题：

What is the name of the VTP mode of operation that enables a switch to forward only VTP advertisements while still permitting the editing of local VLAN information?()

A. server

B. client

C. tunnel

D. transparent


参考答案：D

第7题：

ISL is being configured on a Company switch.  Which of the following choices are true regarding  the ISL protocol？ （）

  • A、 It can be used between Cisco and non-Cisco switch devices.
  • B、 It calculates a new CRC field on top of the existing CRC field.
  • C、 It adds 4 bytes of protocol-specific information to the original Ethernet frame.
  • D、 It adds 30 bytes of protocol-specific information to the original Ethernet frame.

正确答案:B,D

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 are true regarding an Ethernet collision domain?（）

  • A、If a switch is used, the collision domain is limited to each device and the switch
  • B、If a hub is used, the collision domain is limited to each device and the hub
  • C、If a hub is used, the collision domain includes all devices connected to the hub
  • D、If a switch is used, the collision domain includes all devices connected to the switch

正确答案:A,C

第10题：

What three pieces of information can be used in an extended access list to filter traffic (Choose three.)（）。

  • A、protocol
  • B、VLAN number
  • C、TCP or UDP port numbers
  • D、source switch port number
  • E、source IP address and destination IP address
  • F、source MAC address and destination MAC address

正确答案:A,C,E

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