单选题Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）A DTPB RPRC SDHD CWDME DWDM

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单选题

Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual （counter-rotating） ring topology？（）

DTP

RPR

SDH

CWDM

DWDM

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相似问题和答案

第1题：

Which layer in the TCP／IP model is responsible for delivering packets to their destination?()

A. Application Layer

B. Transport Layer

C. Internet Layer

D. Network Access Layer

参考答案：C

第2题：

Which layer-function is mostly implemented in a network adapter（）。

A.Physical layer and link layer

B.Network layer and transport layer

C.Physical layer and network layer

D.Transport layer and application layer

正确答案：A

第3题：

Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

B. The DHCP Discover message uses UDP as the transport layer protocol.

C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.

D. The DHCP Discover message uses TCP as the transport layer protocol.

E. The DHCP Discover message does not use a Layer 2 destination address.

F. The DHCP Discover message does not require a transport layer protocol.

正确答案：AB
A,B 解析：Explanation:
DHCP uses UDP as its transport protocol. DHCP messages from a client to a server are sent to the DHCP server port (UDP port 67), and DHCP messages from a server to a client are sent to the DHCP client port (UDP port 68).The client broadcasts a DHCPDISCOVER message on its local physical subnet. The DHCPDISCOVER message may include options that suggest values for the network address and lease duration. BOOTP relay agents may pass the message on to DHCP servers not on the same physical subnet.

Each server may respond with a DHCPOFFER message that includes an available network address in the "ipaddr" field (and other configuration parameters in DHCP options). Servers need not reserve the offered network address, although the protocol will work more efficiently if the server avoids allocating the offered network address to another client. The server unicasts the DHCPOFFER message to the client (using the DHCP/BOOTP relay agent if necessary) if possible, or may broadcast the message to a broadcast address (preferably 255.255.255.255) on the client's subnet.

Incorrect Answers:
C. DHCP messages are broadcast to the "all hosts" address. IP multicast addresses are not used.

D. UDP is used, not TCP.

E. Since DHCP is used so that a client can obtain an IP address, a layer two destination address must be used, as the layer 3 IP address does not yet exist on the client for the return traffic.

F. DHCP, along with nearly every other type of traffic, requires the use of a transport layer protocol.

第4题：

Which layer-function is mostly implemented in a network adapter?（）.

A.Physical layer and link layer
B.Network layer and transport layer
C.Physical layer and.network layer
D.Transport layer and application layer

答案：A

解析：

解析：翻译：网卡通常作用于（）？A．物理层和数据链路层B．网络层和传输层C．物理层和网络层D．传输层和应用层

第5题：

You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet－based transmission optimized for data based on a dual ring topology?()

A. DynamicTrunking Protocol

B. Resilient Packet Ring

C. Synchronous Digital Hierarchy

D. Coarse Wave Division Multiplexing

参考答案：B

第6题：

TCP/IP communication protocol contains four layers． From bottom to top, the four layers are __（71）__．

A.network interface layer, internet layer, transport layer and application layer

B.internet layer, network interface layer, transport layer and application layer

C.network interface layer, transport layer, network interface layer and application layer

D.application layer, transport layer, internet layer and network interface layer

正确答案：A
TCP/IP协议是当今世界上最流行的开放系统协议集，它正在支撑着Internet的正常运转。它由4层组成，由低到高依次为网络接口层．Internet层．传输层．应用层。

第7题：

When an IP packet is Layer 3－switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? ()

A. Layer 2 TTL

B. Layer 3 TTL

C. Layer 3 source address

D. Layer 3 transport protocol

E. Layer 3 destination address

参考答案：B

第8题：

● TCP/IP communication protocol contains four layers. From bottom to top, the four layers are __(71)__.

（71）A．network interface layer, internet layer, transport layer and application layer

B．internet layer, network interface layer, transport layer and application layer

C．network interface layer, transport layer, network interface layer and application layer

D．application layer, transport layer, internet layer and network interface layer

正确答案：A

第9题：

Which OSI layer does a bridge operate at?

A．the Physical Layer

B．the Network Layer

C．the Transport Layer

D．the Data Link Layer

正确答案：D

第10题：

IPsec, also known as the internet Protocol ( ) , defines the architecture for security services for IP network traffic IPsec describes the framework for providing security a the IP layer, as well as the suite of protocols designed to provide that security: through_ ( )_ and encryption of IP network packets. IPec can be used 10 protect network data, for example, by setting up circuits using IPsec ( ), in which all data being sent between two endpoints is encrypted, as with a Virtual (请作答此空) Network connection ;for encrypting application layer data ;and for providing security for routers sending routing data across the public internet. Internet traffic can also be secured from host to host without the use of IPsec, for example by encryption at the ( ) layer with HTTP Secure (TTPS)or an the transport layer wit the Transport Layer Security (TLS)protocol.

A.pubic]
B.private]
C.personal
D.proper

答案：B

解析：

Which of these is a Layer 2 transport architecture that prov

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