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What is the mechanism that is used to allocate MAC addresses

题目
单选题
What is the mechanism that is used to allocate MAC addresses that are assigned to the VDC for the system MAC address？（）
A

 NX-OS uses a random MAC address from the IEEE OUI block that is assigned to Cisco.

B

 The VDC system MAC is pulled from the active supervisor and concatenated through a hash to ensure uniqueness.

C

 NX-OS uses a value that is based on a range that is assigned to the SPROM of the system backplane.

D

 The VDC system MAC is based on a range that is allocated to the first line card that is installed in the switch.

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相似问题和答案

第1题：

The Dynamic Host Configuration Protocol provides configuration parameters to Internet（ ）.DHCP consists of two components:a（ ）for delivering host-specifie configuration parameters from a DHCP server to a host and a mechanism for allocation of network addresses to hosts.DHCP is built on a client-server model,where designated DHCP server hosts allocate network addresses and deliver（ ）parameters to dynamically configured hosts.DHCP supports three mechanisms for IP address allocation.In“automatic allocation”,DHCP assigns a（本题）IP address to client.In“dynamic allocation”,DHCP assigns an IP address to a client for a limited period of time.In“manual allocation”,a client’s IP address is assigned by the network（ ）,and DHCP is used simply to convey the assigned address to the client.

A.permanent
B.dynamic
C.connection
D.session

答案：B
解析：

第2题：

After enabling port security on a Cisco Catalyst switch， what is the default action when the configuredmaximum of allowed MAC addresses value is exceeded？（）

  • A、The port’s violation mode is set to restrict
  • B、The port is shut down
  • C、The MAC address table is cleared and the new MAC address is entered into the table
  • D、The port remains enabled， but bandwidth is throttled until old MAC addresses are aged out

正确答案:B

第3题：

Which two design concerns must be addressed when designing a multicast implementation?()

A. only the low-order 23 bits of the MAC address are used to map IP addresses

B. only the low-order 24 bits of the MAC address are used to map IP addresses

C. only the high-order 23 bits of the MAC address are used to map IP addresses

D. only the low-order 23 bits of the IP address are used to map MAC addresses

E. the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses

F. the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresses


参考答案：A, F

第4题：

A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?（）

  • A、BPDU
  • B、Port security
  • C、RSTP
  • D、STP
  • E、VTP
  • F、Blocking mode

正确答案:B

第5题：

In a Cisco Unified Computing System， What is the "designated receiver" port in end-host mode used for？（）

  • A、 Sending all broadcasts
  • B、 Receiving all traffic from upstream switches
  • C、 Receiving broadcast traffic
  • D、 Negotiating spanning tree with upstream switches
  • E、 Learning MAC addresses from upstream switches

正确答案:C

第6题：

The Dynamic Host Configuration Protocol provides configuration parameters to Internet（ ）.DHCP consists of two components:a（本题）for delivering host-specifie configuration parameters from a DHCP server to a host and a mechanism for allocation of network addresses to hosts.DHCP is built on a client-server model,where designated DHCP server hosts allocate network addresses and deliver（ ）parameters to dynamically configured hosts.DHCP supports three mechanisms for IP address allocation.In“automatic allocation”,DHCP assigns a（ ）IP address to client.In“dynamic allocation”,DHCP assigns an IP address to a client for a limited period of time.In“manual allocation”,a client’s IP address is assigned by the network（ ）,and DHCP is used simply to convey the assigned address to the client.

A.router
B.protocol
C.host
D.mechanism

答案：B
解析：

第7题：

What are the "bound IP addresses" used for in LDP？（）

  • A、For each such address and mask /32, one label binding is created.
  • B、As the TCP endpoint, IP addresses are used by the LDP session.
  • C、These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
  • D、These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly. 

正确答案:C

第8题：

What is valid reason for a switch to deny port access to new devices when port security is enabled?()

A. The denied MAC addresses have already been learned or confgured on another secure interface in the same VLAN.

B. The denied MAC address are statically configured on the port.

C. The minimum MAC threshold has been reached.

D. The absolute aging times for the denied MAC addresses have expired.


参考答案：B

第9题：

What is the purpose of a network mask?（）

  • A、It is used in conjunction with the wildcard mask to determine the number of hosts on a network
  • B、It is used to define which parts of the IP address are allocated to host addresses and network prefixes
  • C、It is used to hide subnets from external networks by masking the subnets with NAT
  • D、It is used to differentiate a network as a classful network or a classless network

正确答案:B

第10题：

A Cisco UCS fabric interconnect in end-host mode learns MAC addresses on which port types？（）

  • A、 Uplink Ethernet ports or border ports
  • B、 Appliance ports
  • C、 Server ports
  • D、 Fabric ports
  • E、 Backplane ports
  • F、 vEth interfaces
  • G、 A Fabric Interconnect doesn’t learn MAC addresses in End Host mode. Pinning is used instead.

正确答案:B,C,E,F

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