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Refer to the graphic.Host A is communicating with the seiver. What will be the source MAC address of the frames received by Host A from the server?()

题目
Refer to the graphic.Host A is communicating with the seiver. What will be the source MAC address of the frames received by Host A from the server?()

A.the MAC address of the seiver network interface

B.the MAC address of host A

C.the MAC address of router interface e 1

D.the MAC address of router interface e0

参考答案和解析
参考答案：D
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相似问题和答案

第1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2题：

A host is attempting to send data to another host on a different network. What is the first action that the sending host will take?()

A. Drop the data.

B. Send the data frames to the default gateway.

C. Create an ARP request to get a MAC address for the receiving host.

D. Send a TCP SYN and wait for the SYN ACK with the IP address of the receiving host.


参考答案：C

第3题：

You have configured a Ezonexam switch as shown below:

Ezonexam3(config-if) switchport port-security

Ezonexam3(config-if) switchport port-security mac-address sticky

Select the action below that results from executing these commands.

A. A dynamically learned MAC address is saved in the VLAN database.

B. A dynamically learned MAC address is saved in the startup-configuration file.

C. Statically configured MAC addresses are saved in the startup-configuration file if frames from that address are received.

D. A dynamically learned MAC address is saved in the running-configuration file.

E. Statically configured MAC addresses are saved in the running-configuration file if frames from that address are received.

F. None of the above


正确答案：D
D 解析：Explanation:
With port security, the switch supports these types of secure MAC addresses:

Static secure MAC addresses-These are manually configured by using the switchport port-security mac-address mac-address interface configuration command, stored in the address table, and added to the switch running configuration.

Dynamic secure MAC addresses-These are dynamically configured, stored only in the address table, and removed when the switch restarts.

Sticky secure MAC addresses-These are dynamically configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, when the switch restarts, the interface does not need to dynamically reconfigure them.

You can configure an interface to convert the dynamic MAC addresses to sticky secure MAC addresses and to add them to the running configuration by enabling sticky learning. To enable sticky learning, enter the switchport port-security mac-address sticky interface configuration command. When you enter this command, the interface converts all the dynamic secure MAC addresses, including those that were dynamically learned before sticky learning was enabled, to sticky secure MAC addresses. The interface adds all the sticky secure MAC addresses to the running configuration.

The sticky secure MAC addresses do not automatically become part of the configuration file, which is the startup configuration used each time the switch restarts. If you save the sticky secure MAC addresses in the configuration file, when the switch restarts, the interface does not need to relearn these addresses. If you do not save the sticky secure addresses, they are lost.

第4题：

Typically，an IP address refers to an individual host on a particular network. IP also accommodates addresses that refer to a group of hosts on one or more networks.Such addresses are referred to as multicast addresses，and the act of sending a packet from a source to the members of a （71）group is referred to as multicasting. Multicasting done （72） the scope of a single LAN segment is straight forward. IEEE 802 and other LAN protocols include provision for MAC-level multicast addresses. A packet with a multicast address is transmitted on a LAN segment.Those stations that are members of the （73）multicast group recognize the multicast address and （74）the packet.In this case,only a single copy of the packet is ever transmitted.This technique works because of the （本题）nature of a LAN:A transmission from any one station is received by all other stations on the LAN.


A .multicast
B. unicast
C.broadcast
D.multiple unicast

答案：C
解析：

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：

Which statement about vlan operation on cisco catalyst switches is true?()

A. when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.

B. unkown unicast frames are retransmitted only to the ports that belong to the same vlan

C. ports between switches should be configured in access mode so that vlans can span across the ports

D. broadcast and multicast frames are retransmitted to ports that are configured on different vlan.


参考答案：B

第7题：

Refer to the exhibit. What will Router1 do when it receives the data frame shown?()

A.Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.

B.Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1.

C.Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.

D. Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.

E.Router1 will forward the data packet out interface FastEthernet0/1.

F.Router1 will forward the data packet out interface FastEthernet0/2.


参考答案：A, C, F

第8题：

The Ezonexam network administrator wants to ensure that only a single web server can connect to pot Fa0/1 on a catalyst switch. The server is plugged into the switch's Fast Eth. 0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of this server is allowed by switch port Fa0/1? (Choose two)

A．Configure port Fa0/1 to accept connections only from the static IP address of the server

B．Configure the MAC address of the server as a static entry associated with port Fa0/1

C．Employ a proprietary connector type on Fa0/1 that is incomputable with other host connectors

D．Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server

E．Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address


正确答案：BD
解析：Explanation:
You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station attempting to access the port is different from any of the MAC addresses specified for that port.

When a secure port receives a packet, the source MAC address of the packet is compared to the list of secure source addresses that were manually configured or autoconfigured (learned) on the port. If a MAC address of a device attached to the port differs from the list of secure addresses, the port either shuts down permanently (default mode), shuts down for the time you have specified, or drops incoming packets from the insecure host.

The port's behavior. depends on how you configure it to respond to a security violation. When a security violation occurs, the Link LED for that port turns orange, and a link-down trap is sent to the Simple Network Management Protocol (SNMP) manager. An SNMP trap is not sent if you configure the port for restrictive violation mode. A trap is sent only if you configure the port to shut down during a security violation.

第9题：

Refer to the exhibit. The user at Workstation B reports that Server A cannot be reacheD.What ispreventing Workstation B from reaching Server A?()

A.The IP address for Server A is a broadcast address.

B.The IP address for Workstation B is a subnet address.

C.The gateway for Workstation B is not on the same subnet.

D.The gateway for Server A is not on the same subnet.


参考答案：D

第10题：

Host 1 receives a file from remote server 1. Which MAC address appears as the source address in the header of the frames received by Host 1（）。

  • A、The MAC address of the NIC in Host 1
  • B、The MAC address of the NIC in server 1
  • C、The MAC address of the Fa0/0 interface of router R1
  • D、The MAC address of the s0/0/0 interface of the router R2

正确答案:C

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