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（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
A.The MAC address
B.The IP address
C.The subnet address
D.The virtual address
B.The IP address
C.The subnet address
D.The virtual address
参考答案
参考解析
解析：MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。IEEE是由多个研究底层协议的机构组成的权威组织。以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。令牌环网是一种符合IEEE 802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。具有较大的带宽，FDDI的设计带宽为100Mbit/s。具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。
更多 “（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.A.The MAC address B.The IP address C.The subnet address D.The virtual address” 相关考题
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is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication。A．The virtual addressB．The subnet addressC．The MAC addressD．The IP address
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Refer to the exhibit. Which three statements correctly describe Network Device A?()
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For each blank，choose the best answer from the four choices and write down on the answer sheet.
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（请作答此空）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.ISO
B.ANSI
C.CCITT
D.IEEE
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For each blank，choose the best answer from the four choices and write down on the answer sheet.
（请作答此空）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（72）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（73）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（74）is the popular LAN developed under the direction of the IEEE 802.5.
（74）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.The MAC address
B.The IP address
C.The subnet address
D.The virtual address
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For each blank，choose the best answer from the four choices and write down on the answer sheet.
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（请作答此空）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.The hub
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C.The router
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For what two purposes does the Ethernet protocol use physical addresses？（）A、to uniquely identify devices at Layer 2B、to allow communication with devices on a different networkC、to differentiate a Layer 2 frame from a Layer 3 packetD、to establish a priority system to determine which device gets to transmit firstE、to allow communication between different devices on the same networkF、to allow detection of a remote device when its physical address is unknown
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What are the header sizes for point-to-point and multi-point GRE（also known asmGRE） with tunnel key？（）A、 4 bytes for bothB、 4 bytes， and 8 bytes respectivelyC、 8 bytes for bothD、 24 bytes for both
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多选题Refer to the exhibit. Which three statements correctly describe Network Device A?（）AWith a network wide mask of 255.255.255.128, each interface does not require an IP address.BWith a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.CWith a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.DWith a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.EWith a network wide mask of 255.255.254.0, each interface does not require an IP address.
考题
单选题Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）A
physicalB
datalinkC
networkD
transport
考题
多选题Which two types of activities does the Lightweight Access Point Protocol （LWAPP） define？ （Choose two.）（）Aaccess point certification and software controlBcompression and Layer 3 address mappingCLayer 3 addressing and distributionDpacket encapsulation， fragmentation， and formattingESNMP monitoring services
考题
单选题A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）A
networkB
applicationC
sessionD
data link
考题
多选题For what two purposes does the Ethernet protocol use physical addresses？（）Ato uniquely identify devices at Layer 2Bto allow communication with devices on a different networkCto differentiate a Layer 2 frame from a Layer 3 packetDto establish a priority system to determine which device gets to transmit firstEto allow communication between different devices on the same networkFto allow detection of a remote device when its physical address is unknown
考题
单选题Which issue or set of issues does the Lightweight Access Point Protocol （LWAPP） address？（）A
reduction of processing in wireless controllersB
distributed approach to authentication， encryption， and policy enforcementC
provides security by blocking communication between access points and wireless clientsD
access point discovery， information exchange， and configuration
考题
多选题A new lightweight access point （LAP） has been installed in the Company WLAN. Which two statements correctly describe the association process between this LAP and a WLAN controller？ （）AAn access point will search for a controller using a broadcast address if using LWAPP Layer 2 and a unicast address if using LWAPP Layer 3 mode.BIf multiple wireless controllers are detected by an access point， the controller with the fewest associated access points is chosen to associate with.CIn order to associate in Layer 3 mode， the access point must have been preconfigured with an IP address.DOnce an access point associates with a controller in LWAPP Layer 3 mode， it receives an IP address from the controller.EAn access point first searches for a controller in LWAPP Layer 2 mode. If the search is not successful， the access point then attempts to locate a controller in LWAPP Layer 3 mode.FIf multiple wireless controllers are detected by an access point， all of them will be used and traffic will be load balanced.
考题
单选题What are the header sizes for point-to-point and multi-point GRE（also known asmGRE） with tunnel key？（）A
4 bytes for bothB
4 bytes， and 8 bytes respectivelyC
8 bytes for bothD
24 bytes for both
考题
多选题In computer networking a multicast address is an identifier for a group of hosts that have joined amulticast group. Multicast addressing can be used in the Link Layer （OSI Layer 2）， such as Ethernet Multicast， as well as at the Internet Layer （OSI Layer 3） as IPv4 or IPv6 Multicast. Whichtwo descriptions are correct regarding multicast addressing？（）AThe first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value thatindicates a multicast applicationBThe last 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast applicationCTo calculate the Layer 2 multicast address， the host maps the last 23 bits of the IP address intothe last 24 bits of the MAC address. The high-order bit is set to 0DThe first 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast application
考题
单选题How is network layer addressing accomplished in the OSI protocol suite?（）A
Internet Protocol addressB
Media Access Control addressC
Packet Layer Proto col addressD
Network Service Access Point addressE
Authority and Format Identifier address
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