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单选题What information is used by a switch to forward an Ethernet frame to its destination?（）A IP addressB destination MAC addressC ARP table entryD FCS checksum

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：

Which of one the following fields is contained within an IEEE Ethernet frame header?()

A. source and destination MAC address

B. source MAC address and destination network address only

C. source and destination network address only

D. source network address and destination MAC address

E. source and destination MAC address and source and destination network address


参考答案：A

第3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4题：

If the router R1 has a packet with a destination address 192.168.1.255, what describes the operation of the network()。

A.R1 will forward the packet out all interfaces.

B.R1 will drop this packet because this it is not a valid IP address.

C.As R1 forwards the frame containing this packet, Sw-A will add 192.168.1.255 to its MAC table.

D.R1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF

E.As R1 forwards the frame containing this packet, Sw-A will forward it to the device assigned the IP address of 192.168.1.255.


参考答案：B

第5题：

What does a Layer 2 switch do if it receives a frame with a destination MAC address that is not found in its MAC address table?()

A. The frame is dropped.

B. The frame is addressed with a broadcast MAC address and sent out all ports.

C. The frame is sent out all ports except the receiving port.

D. An ARP request is sent out all ports except the receiving port.

E. A destination unreachable message is sent back to the source address.

F. None of the above.


参考答案：C

第6题：

Inverse ARP is being used in the TestKing frame relay network. What is the purpose of Inverse ARP?()

A. To ma a known IP address to a MAC address

B. To map a known DLCI to a MAC address

C. To ma a known MAC address to an IP address

D. To ma a known DLCI address to a IP address

E. To ma a known IP address to a SPID address

F. To ma a known SPID address to a MAC address


参考答案：D

第7题：

What does a Layer 2 switch use to decide where to forward a received frame?()

A. source MAC address

B. source IP address

C. source switch port

D. destination IP address

E. destination port address

F. destination MAC address


参考答案：F

第8题：

●When a bridge transmits an Ethernet frame, the Ethernet frame. has(75).

(75)

A. the broadcast address for the its source address

B. the bridge's LAN address for its destination address

C. the bridge's LAN address for its source address

D. none of the above


正确答案：D

第9题：

What are three values that must be the same within a sequence of packets for Netflow to consider them a network flow?()

A.source IP address

B.source MAC address

C.egress interface

D.ingress interface

E.destination IP address

F.IP next-hop


参考答案：A, D, E

第10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

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